Merge remote-tracking branch 'origin/main' into task-white-rect-frame-cmd-d-ctrl-d

# Conflicts:
#	Sources/AppDelegate.swift
#	Sources/TerminalWindowPortal.swift

.github/workflows/ci.yml

@@ -7,6 +7,15 @@ on:
   pull_request:
 
 jobs:
+  workflow-guard-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Validate self-hosted runner guards
+        run: ./tests/test_ci_self_hosted_guard.sh
+
   web-typecheck:
     runs-on: ubuntu-latest
     defaults:
@@ -26,6 +35,8 @@ jobs:
         run: bun tsc --noEmit
 
   ui-tests:
+    # Never run self-hosted jobs for fork pull requests.
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
     runs-on: self-hosted
     concurrency:
       group: self-hosted-build

Sources/AppDelegate.swift

@@ -36,6 +36,188 @@ enum FinderServicePathResolver {
     }
 }
 
+enum TerminalDirectoryOpenTarget: String, CaseIterable {
+    case vscode
+    case cursor
+    case windsurf
+    case antigravity
+    case finder
+    case terminal
+    case iterm2
+    case ghostty
+    case warp
+    case xcode
+    case androidStudio
+    case zed
+
+    struct DetectionEnvironment {
+        let homeDirectoryPath: String
+        let fileExistsAtPath: (String) -> Bool
+
+        static let live = DetectionEnvironment(
+            homeDirectoryPath: FileManager.default.homeDirectoryForCurrentUser.path,
+            fileExistsAtPath: { FileManager.default.fileExists(atPath: $0) }
+        )
+    }
+
+    static var commandPaletteShortcutTargets: [Self] {
+        Array(allCases)
+    }
+
+    static func availableTargets(in environment: DetectionEnvironment = .live) -> Set<Self> {
+        Set(commandPaletteShortcutTargets.filter { $0.isAvailable(in: environment) })
+    }
+
+    static let cachedLiveAvailableTargets: Set<Self> = availableTargets(in: .live)
+
+    var commandPaletteCommandId: String {
+        "palette.terminalOpenDirectory.\(rawValue)"
+    }
+
+    var commandPaletteTitle: String {
+        switch self {
+        case .vscode:
+            return "Open Current Directory in VS Code"
+        case .cursor:
+            return "Open Current Directory in Cursor"
+        case .windsurf:
+            return "Open Current Directory in Windsurf"
+        case .antigravity:
+            return "Open Current Directory in Antigravity"
+        case .finder:
+            return "Open Current Directory in Finder"
+        case .terminal:
+            return "Open Current Directory in Terminal"
+        case .iterm2:
+            return "Open Current Directory in iTerm2"
+        case .ghostty:
+            return "Open Current Directory in Ghostty"
+        case .warp:
+            return "Open Current Directory in Warp"
+        case .xcode:
+            return "Open Current Directory in Xcode"
+        case .androidStudio:
+            return "Open Current Directory in Android Studio"
+        case .zed:
+            return "Open Current Directory in Zed"
+        }
+    }
+
+    var commandPaletteKeywords: [String] {
+        let common = ["terminal", "directory", "open", "ide"]
+        switch self {
+        case .vscode:
+            return common + ["vs", "code", "visual", "studio"]
+        case .cursor:
+            return common + ["cursor"]
+        case .windsurf:
+            return common + ["windsurf"]
+        case .antigravity:
+            return common + ["antigravity"]
+        case .finder:
+            return common + ["finder", "file", "manager", "reveal"]
+        case .terminal:
+            return common + ["terminal", "shell"]
+        case .iterm2:
+            return common + ["iterm", "iterm2", "terminal", "shell"]
+        case .ghostty:
+            return common + ["ghostty", "terminal", "shell"]
+        case .warp:
+            return common + ["warp", "terminal", "shell"]
+        case .xcode:
+            return common + ["xcode", "apple"]
+        case .androidStudio:
+            return common + ["android", "studio"]
+        case .zed:
+            return common + ["zed"]
+        }
+    }
+
+    func isAvailable(in environment: DetectionEnvironment = .live) -> Bool {
+        applicationPath(in: environment) != nil
+    }
+
+    func applicationURL(in environment: DetectionEnvironment = .live) -> URL? {
+        guard let path = applicationPath(in: environment) else { return nil }
+        return URL(fileURLWithPath: path, isDirectory: true)
+    }
+
+    private func applicationPath(in environment: DetectionEnvironment) -> String? {
+        for path in expandedCandidatePaths(in: environment) where environment.fileExistsAtPath(path) {
+            return path
+        }
+        return nil
+    }
+
+    private func expandedCandidatePaths(in environment: DetectionEnvironment) -> [String] {
+        let globalPrefix = "/Applications/"
+        let userPrefix = "\(environment.homeDirectoryPath)/Applications/"
+        var expanded: [String] = []
+
+        for candidate in applicationBundlePathCandidates {
+            expanded.append(candidate)
+            if candidate.hasPrefix(globalPrefix) {
+                let suffix = String(candidate.dropFirst(globalPrefix.count))
+                expanded.append(userPrefix + suffix)
+            }
+        }
+
+        return uniquePreservingOrder(expanded)
+    }
+
+    private var applicationBundlePathCandidates: [String] {
+        switch self {
+        case .vscode:
+            return [
+                "/Applications/Visual Studio Code.app",
+                "/Applications/Code.app",
+            ]
+        case .cursor:
+            return [
+                "/Applications/Cursor.app",
+                "/Applications/Cursor Preview.app",
+                "/Applications/Cursor Nightly.app",
+            ]
+        case .windsurf:
+            return ["/Applications/Windsurf.app"]
+        case .antigravity:
+            return ["/Applications/Antigravity.app"]
+        case .finder:
+            return ["/System/Library/CoreServices/Finder.app"]
+        case .terminal:
+            return ["/System/Applications/Utilities/Terminal.app"]
+        case .iterm2:
+            return [
+                "/Applications/iTerm.app",
+                "/Applications/iTerm2.app",
+            ]
+        case .ghostty:
+            return ["/Applications/Ghostty.app"]
+        case .warp:
+            return ["/Applications/Warp.app"]
+        case .xcode:
+            return ["/Applications/Xcode.app"]
+        case .androidStudio:
+            return ["/Applications/Android Studio.app"]
+        case .zed:
+            return [
+                "/Applications/Zed.app",
+                "/Applications/Zed Preview.app",
+                "/Applications/Zed Nightly.app",
+            ]
+        }
+    }
+
+    private func uniquePreservingOrder(_ paths: [String]) -> [String] {
+        var seen: Set<String> = []
+        var deduped: [String] = []
+        for path in paths where seen.insert(path).inserted {
+            deduped.append(path)
+        }
+        return deduped
+    }
+}
+
 enum WorkspaceShortcutMapper {
     /// Maps Cmd+digit workspace shortcuts to a zero-based workspace index.
     /// Cmd+1...Cmd+8 target fixed indices; Cmd+9 always targets the last workspace.
@@ -70,10 +252,9 @@ func browserOmnibarSelectionDeltaForCommandNavigation(
     chars: String
 ) -> Int? {
     guard hasFocusedAddressBar else { return nil }
-    let normalizedFlags = flags
-        .intersection(.deviceIndependentFlagsMask)
-        .subtracting([.numericPad, .function])
-    guard normalizedFlags == [.control] else { return nil }
+    let normalizedFlags = browserOmnibarNormalizedModifierFlags(flags)
+    let isCommandOrControlOnly = normalizedFlags == [.command] || normalizedFlags == [.control]
+    guard isCommandOrControlOnly else { return nil }
     if chars == "n" { return 1 }
     if chars == "p" { return -1 }
     return nil
@@ -85,9 +266,7 @@ func browserOmnibarSelectionDeltaForArrowNavigation(
     keyCode: UInt16
 ) -> Int? {
     guard hasFocusedAddressBar else { return nil }
-    let normalizedFlags = flags
-        .intersection(.deviceIndependentFlagsMask)
-        .subtracting([.numericPad, .function])
+    let normalizedFlags = browserOmnibarNormalizedModifierFlags(flags)
     guard normalizedFlags == [] else { return nil }
     switch keyCode {
     case 125: return 1
@@ -96,10 +275,14 @@ func browserOmnibarSelectionDeltaForArrowNavigation(
     }
 }
 
-func browserOmnibarShouldSubmitOnReturn(flags: NSEvent.ModifierFlags) -> Bool {
-    let normalizedFlags = flags
+func browserOmnibarNormalizedModifierFlags(_ flags: NSEvent.ModifierFlags) -> NSEvent.ModifierFlags {
+    flags
         .intersection(.deviceIndependentFlagsMask)
-        .subtracting([.numericPad, .function])
+        .subtracting([.numericPad, .function, .capsLock])
+}
+
+func browserOmnibarShouldSubmitOnReturn(flags: NSEvent.ModifierFlags) -> Bool {
+    let normalizedFlags = browserOmnibarNormalizedModifierFlags(flags)
     return normalizedFlags == [] || normalizedFlags == [.shift]
 }
 
@@ -204,6 +387,54 @@ func shouldRouteTerminalFontZoomShortcutToGhostty(
     return browserZoomShortcutAction(flags: flags, chars: chars, keyCode: keyCode) != nil
 }
 
+func cmuxOwningGhosttyView(for responder: NSResponder?) -> GhosttyNSView? {
+    guard let responder else { return nil }
+    if let ghosttyView = responder as? GhosttyNSView {
+        return ghosttyView
+    }
+
+    if let view = responder as? NSView,
+       let ghosttyView = cmuxOwningGhosttyView(for: view) {
+        return ghosttyView
+    }
+
+    if let textView = responder as? NSTextView,
+       let delegateView = textView.delegate as? NSView,
+       let ghosttyView = cmuxOwningGhosttyView(for: delegateView) {
+        return ghosttyView
+    }
+
+    var current = responder.nextResponder
+    while let next = current {
+        if let ghosttyView = next as? GhosttyNSView {
+            return ghosttyView
+        }
+        if let view = next as? NSView,
+           let ghosttyView = cmuxOwningGhosttyView(for: view) {
+            return ghosttyView
+        }
+        current = next.nextResponder
+    }
+
+    return nil
+}
+
+private func cmuxOwningGhosttyView(for view: NSView) -> GhosttyNSView? {
+    if let ghosttyView = view as? GhosttyNSView {
+        return ghosttyView
+    }
+
+    var current: NSView? = view.superview
+    while let candidate = current {
+        if let ghosttyView = candidate as? GhosttyNSView {
+            return ghosttyView
+        }
+        current = candidate.superview
+    }
+
+    return nil
+}
+
 #if DEBUG
 func browserZoomShortcutTraceCandidate(
     flags: NSEvent.ModifierFlags,
@@ -603,6 +834,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         sidebarSelectionState: SidebarSelectionState
     ) {
         let key = ObjectIdentifier(window)
+        #if DEBUG
+        let priorManagerToken = debugManagerToken(self.tabManager)
+        #endif
         if let existing = mainWindowContexts[key] {
             existing.window = window
         } else {
@@ -626,6 +860,11 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         commandPaletteSelectionByWindowId[windowId] = 0
         commandPaletteSnapshotByWindowId[windowId] = .empty
 
+#if DEBUG
+        dlog(
+            "mainWindow.register windowId=\(String(windowId.uuidString.prefix(8))) window={\(debugWindowToken(window))} manager=\(debugManagerToken(tabManager)) priorActiveMgr=\(priorManagerToken) \(debugShortcutRouteSnapshot())"
+        )
+#endif
         if window.isKeyWindow {
             setActiveMainWindow(window)
         }
@@ -855,6 +1094,117 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         return mainWindowContexts[ObjectIdentifier(window)]
     }
 
+#if DEBUG
+    private func debugManagerToken(_ manager: TabManager?) -> String {
+        guard let manager else { return "nil" }
+        return String(describing: Unmanaged.passUnretained(manager).toOpaque())
+    }
+
+    private func debugWindowToken(_ window: NSWindow?) -> String {
+        guard let window else { return "nil" }
+        let id = mainWindowId(for: window).map { String($0.uuidString.prefix(8)) } ?? "none"
+        let ident = window.identifier?.rawValue ?? "nil"
+        let shortIdent: String
+        if ident.count > 120 {
+            shortIdent = String(ident.prefix(120)) + "..."
+        } else {
+            shortIdent = ident
+        }
+        return "num=\(window.windowNumber) id=\(id) ident=\(shortIdent) key=\(window.isKeyWindow ? 1 : 0) main=\(window.isMainWindow ? 1 : 0)"
+    }
+
+    private func debugContextToken(_ context: MainWindowContext?) -> String {
+        guard let context else { return "nil" }
+        let selected = context.tabManager.selectedTabId.map { String($0.uuidString.prefix(5)) } ?? "nil"
+        let hasWindow = (context.window != nil || windowForMainWindowId(context.windowId) != nil) ? 1 : 0
+        return "id=\(String(context.windowId.uuidString.prefix(8))) mgr=\(debugManagerToken(context.tabManager)) tabs=\(context.tabManager.tabs.count) selected=\(selected) hasWindow=\(hasWindow)"
+    }
+
+    private func debugShortcutRouteSnapshot(event: NSEvent? = nil) -> String {
+        let activeManager = tabManager
+        let activeWindowId = activeManager.flatMap { windowId(for: $0) }.map { String($0.uuidString.prefix(8)) } ?? "nil"
+        let selectedWorkspace = activeManager?.selectedTabId.map { String($0.uuidString.prefix(5)) } ?? "nil"
+
+        let contexts = mainWindowContexts.values
+            .map { context in
+                let marker = (activeManager != nil && context.tabManager === activeManager) ? "*" : "-"
+                let window = context.window ?? windowForMainWindowId(context.windowId)
+                let selected = context.tabManager.selectedTabId.map { String($0.uuidString.prefix(5)) } ?? "nil"
+                return "\(marker)\(String(context.windowId.uuidString.prefix(8))){mgr=\(debugManagerToken(context.tabManager)),win=\(window?.windowNumber ?? -1),key=\((window?.isKeyWindow ?? false) ? 1 : 0),main=\((window?.isMainWindow ?? false) ? 1 : 0),tabs=\(context.tabManager.tabs.count),selected=\(selected)}"
+            }
+            .sorted()
+            .joined(separator: ",")
+
+        let eventWindowNumber = event.map { String($0.windowNumber) } ?? "nil"
+        let eventWindow = event?.window
+        return "eventWinNum=\(eventWindowNumber) eventWin={\(debugWindowToken(eventWindow))} keyWin={\(debugWindowToken(NSApp.keyWindow))} mainWin={\(debugWindowToken(NSApp.mainWindow))} activeMgr=\(debugManagerToken(activeManager)) activeWinId=\(activeWindowId) activeSelected=\(selectedWorkspace) contexts=[\(contexts)]"
+    }
+#endif
+
+    private func mainWindowForShortcutEvent(_ event: NSEvent) -> NSWindow? {
+        if let window = event.window, isMainTerminalWindow(window) {
+            return window
+        }
+        let eventWindowNumber = event.windowNumber
+        if eventWindowNumber > 0,
+           let numberedWindow = NSApp.window(withWindowNumber: eventWindowNumber),
+           isMainTerminalWindow(numberedWindow) {
+            return numberedWindow
+        }
+        if let keyWindow = NSApp.keyWindow, isMainTerminalWindow(keyWindow) {
+            return keyWindow
+        }
+        if let mainWindow = NSApp.mainWindow, isMainTerminalWindow(mainWindow) {
+            return mainWindow
+        }
+        return nil
+    }
+
+    /// Re-sync app-level active window pointers from the currently focused main terminal window.
+    /// This keeps menu/shortcut actions window-scoped even if the cached `tabManager` drifts.
+    @discardableResult
+    func synchronizeActiveMainWindowContext(preferredWindow: NSWindow? = nil) -> TabManager? {
+        let (context, source): (MainWindowContext?, String) = {
+            if let preferredWindow,
+               let context = contextForMainWindow(preferredWindow) {
+                return (context, "preferredWindow")
+            }
+            if let context = contextForMainWindow(NSApp.keyWindow) {
+                return (context, "keyWindow")
+            }
+            if let context = contextForMainWindow(NSApp.mainWindow) {
+                return (context, "mainWindow")
+            }
+            if let activeManager = tabManager,
+               let activeContext = mainWindowContexts.values.first(where: { $0.tabManager === activeManager }) {
+                return (activeContext, "activeManager")
+            }
+            return (mainWindowContexts.values.first, "firstContextFallback")
+        }()
+
+#if DEBUG
+        let beforeManagerToken = debugManagerToken(tabManager)
+        dlog(
+            "shortcut.sync.pre source=\(source) preferred={\(debugWindowToken(preferredWindow))} chosen={\(debugContextToken(context))} \(debugShortcutRouteSnapshot())"
+        )
+#endif
+        guard let context else { return tabManager }
+        if let window = context.window ?? windowForMainWindowId(context.windowId) {
+            setActiveMainWindow(window)
+        } else {
+            tabManager = context.tabManager
+            sidebarState = context.sidebarState
+            sidebarSelectionState = context.sidebarSelectionState
+            TerminalController.shared.setActiveTabManager(context.tabManager)
+        }
+#if DEBUG
+        dlog(
+            "shortcut.sync.post source=\(source) beforeMgr=\(beforeManagerToken) afterMgr=\(debugManagerToken(tabManager)) chosen={\(debugContextToken(context))} \(debugShortcutRouteSnapshot())"
+        )
+#endif
+        return context.tabManager
+    }
+
     private func preferredMainWindowContextForShortcuts(event: NSEvent) -> MainWindowContext? {
         if let context = contextForMainWindow(event.window) {
             return context
@@ -865,13 +1215,26 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         if let context = contextForMainWindow(NSApp.mainWindow) {
             return context
         }
+        if let activeManager = tabManager,
+           let activeContext = mainWindowContexts.values.first(where: { $0.tabManager === activeManager }) {
+            return activeContext
+        }
         return mainWindowContexts.values.first
     }
 
     private func activateMainWindowContextForShortcutEvent(_ event: NSEvent) {
-        guard let context = preferredMainWindowContextForShortcuts(event: event),
-              let window = context.window ?? windowForMainWindowId(context.windowId) else { return }
-        setActiveMainWindow(window)
+        let preferredWindow = mainWindowForShortcutEvent(event)
+#if DEBUG
+        dlog(
+            "shortcut.activate.pre event=\(NSWindow.keyDescription(event)) preferred={\(debugWindowToken(preferredWindow))} \(debugShortcutRouteSnapshot(event: event))"
+        )
+#endif
+        _ = synchronizeActiveMainWindowContext(preferredWindow: preferredWindow)
+#if DEBUG
+        dlog(
+            "shortcut.activate.post event=\(NSWindow.keyDescription(event)) preferred={\(debugWindowToken(preferredWindow))} \(debugShortcutRouteSnapshot(event: event))"
+        )
+#endif
     }
 
     @discardableResult
@@ -1849,7 +2212,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
                     dlog("key.latency path=appMonitor ms=\(delayText) keyCode=\(event.keyCode) mods=\(event.modifierFlags.rawValue) repeat=\(event.isARepeat ? 1 : 0)")
                 }
                 let frType = NSApp.keyWindow?.firstResponder.map { String(describing: type(of: $0)) } ?? "nil"
-                dlog("monitor.keyDown: \(NSWindow.keyDescription(event)) fr=\(frType) addrBarId=\(self.browserAddressBarFocusedPanelId?.uuidString.prefix(8) ?? "nil")")
+                dlog(
+                    "monitor.keyDown: \(NSWindow.keyDescription(event)) fr=\(frType) addrBarId=\(self.browserAddressBarFocusedPanelId?.uuidString.prefix(8) ?? "nil") \(self.debugShortcutRouteSnapshot(event: event))"
+                )
                 if let probeKind = self.developerToolsShortcutProbeKind(event: event) {
                     self.logDeveloperToolsShortcutSnapshot(phase: "monitor.pre.\(probeKind)", event: event)
                 }
@@ -2176,7 +2541,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
 
         // When the terminal has active IME composition (e.g. Korean, Japanese, Chinese
         // input), don't intercept key events — let them flow through to the input method.
-        if let ghosttyView = NSApp.keyWindow?.firstResponder as? GhosttyNSView,
+        if let ghosttyView = cmuxOwningGhosttyView(for: NSApp.keyWindow?.firstResponder),
            ghosttyView.hasMarkedText() {
             return false
         }
@@ -2221,7 +2586,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         // (e.g., split that doesn't properly blur the address bar). If the first responder
         // is a terminal surface, the address bar can't be focused.
         if browserAddressBarFocusedPanelId != nil,
-           NSApp.keyWindow?.firstResponder is GhosttyNSView {
+           cmuxOwningGhosttyView(for: NSApp.keyWindow?.firstResponder) != nil {
 #if DEBUG
             dlog("handleCustomShortcut: clearing stale browserAddressBarFocusedPanelId")
 #endif
@@ -2258,6 +2623,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         }
 
         if matchShortcut(event: event, shortcut: KeyboardShortcutSettings.shortcut(for: .newTab)) {
+#if DEBUG
+            dlog("shortcut.action name=newWorkspace \(debugShortcutRouteSnapshot(event: event))")
+#endif
             // Cmd+N semantics:
             // - If there are no main windows, create a new window.
             // - Otherwise, create a new workspace in the active window.
@@ -2368,6 +2736,11 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
            let manager = tabManager,
            let num = Int(chars),
            let targetIndex = WorkspaceShortcutMapper.workspaceIndex(forCommandDigit: num, workspaceCount: manager.tabs.count) {
+#if DEBUG
+            dlog(
+                "shortcut.action name=workspaceDigit digit=\(num) targetIndex=\(targetIndex) manager=\(debugManagerToken(manager)) \(debugShortcutRouteSnapshot(event: event))"
+            )
+#endif
             manager.selectTab(at: targetIndex)
             return true
         }
@@ -2436,6 +2809,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
 
         // Split actions: Cmd+D / Cmd+Shift+D
         if matchShortcut(event: event, shortcut: KeyboardShortcutSettings.shortcut(for: .splitRight)) {
+#if DEBUG
+            dlog("shortcut.action name=splitRight \(debugShortcutRouteSnapshot(event: event))")
+#endif
             if shouldSuppressSplitShortcutForTransientTerminalFocusState(direction: .right) {
                 return true
             }
@@ -2444,6 +2820,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         }
 
         if matchShortcut(event: event, shortcut: KeyboardShortcutSettings.shortcut(for: .splitDown)) {
+#if DEBUG
+            dlog("shortcut.action name=splitDown \(debugShortcutRouteSnapshot(event: event))")
+#endif
             if shouldSuppressSplitShortcutForTransientTerminalFocusState(direction: .down) {
                 return true
             }
@@ -2678,10 +3057,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         chars: String
     ) -> Bool {
         guard browserAddressBarFocusedPanelId != nil else { return false }
-        let normalizedFlags = flags
-            .intersection(.deviceIndependentFlagsMask)
-            .subtracting([.numericPad, .function])
-        guard normalizedFlags == [.control] else { return false }
+        let normalizedFlags = browserOmnibarNormalizedModifierFlags(flags)
+        let isCommandOrControlOnly = normalizedFlags == [.command] || normalizedFlags == [.control]
+        guard isCommandOrControlOnly else { return false }
         return chars == "n" || chars == "p"
     }
 
@@ -2867,6 +3245,8 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
 
     @discardableResult
     func performSplitShortcut(direction: SplitDirection) -> Bool {
+        _ = synchronizeActiveMainWindowContext(preferredWindow: NSApp.keyWindow ?? NSApp.mainWindow)
+
         let directionLabel: String
         switch direction {
         case .left: directionLabel = "left"
@@ -2932,6 +3312,8 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
 
     @discardableResult
     func performBrowserSplitShortcut(direction: SplitDirection) -> Bool {
+        _ = synchronizeActiveMainWindowContext(preferredWindow: NSApp.keyWindow ?? NSApp.mainWindow)
+
         guard let panelId = tabManager?.createBrowserSplit(direction: direction) else { return false }
         _ = focusBrowserAddressBar(panelId: panelId)
         return true
@@ -3296,10 +3678,18 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
     private func setActiveMainWindow(_ window: NSWindow) {
         guard isMainTerminalWindow(window) else { return }
         guard let context = mainWindowContexts[ObjectIdentifier(window)] else { return }
+#if DEBUG
+        let beforeManagerToken = debugManagerToken(tabManager)
+#endif
         tabManager = context.tabManager
         sidebarState = context.sidebarState
         sidebarSelectionState = context.sidebarSelectionState
         TerminalController.shared.setActiveTabManager(context.tabManager)
+#if DEBUG
+        dlog(
+            "mainWindow.active window={\(debugWindowToken(window))} context={\(debugContextToken(context))} beforeMgr=\(beforeManagerToken) afterMgr=\(debugManagerToken(tabManager)) \(debugShortcutRouteSnapshot())"
+        )
+#endif
     }
 
     private func unregisterMainWindow(_ window: NSWindow) {
@@ -3342,6 +3732,9 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
     }
 
     private func isMainTerminalWindow(_ window: NSWindow) -> Bool {
+        if mainWindowContexts[ObjectIdentifier(window)] != nil {
+            return true
+        }
         guard let raw = window.identifier?.rawValue else { return false }
         return raw == "cmux.main" || raw.hasPrefix("cmux.main.")
     }
@@ -4338,7 +4731,8 @@ private extension NSWindow {
         // Command shortcuts when the terminal is focused — the local event monitor
         // (handleCustomShortcut) already handles app-level shortcuts, and anything
         // remaining should be menu items.
-        if let ghosttyView = self.firstResponder as? GhosttyNSView {
+        let firstResponderGhosttyView = cmuxOwningGhosttyView(for: self.firstResponder)
+        if let ghosttyView = firstResponderGhosttyView {
             // If the IME is composing, don't intercept key events — let them flow
             // through normal AppKit event dispatch so the input method can process them.
             if ghosttyView.hasMarkedText() {
@@ -4381,7 +4775,7 @@ private extension NSWindow {
         // When the terminal is focused, skip the full NSWindow.performKeyEquivalent
         // (which walks the SwiftUI content view hierarchy) and dispatch Command-key
         // events directly to the main menu. This avoids the broken SwiftUI focus path.
-        if self.firstResponder is GhosttyNSView,
+        if firstResponderGhosttyView != nil,
            event.modifierFlags.intersection(.deviceIndependentFlagsMask).contains(.command),
            let mainMenu = NSApp.mainMenu {
             let consumedByMenu = mainMenu.performKeyEquivalent(with: event)

Sources/BrowserWindowPortal.swift

@@ -326,6 +326,8 @@ final class WindowBrowserPortal: NSObject {
     private weak var installedContainerView: NSView?
     private weak var installedReferenceView: NSView?
     private var hasDeferredFullSyncScheduled = false
+    private var hasExternalGeometrySyncScheduled = false
+    private var geometryObservers: [NSObjectProtocol] = []
 
     private struct Entry {
         weak var webView: WKWebView?
@@ -345,9 +347,73 @@ final class WindowBrowserPortal: NSObject {
         hostView.layer?.masksToBounds = true
         hostView.translatesAutoresizingMaskIntoConstraints = true
         hostView.autoresizingMask = []
+        installGeometryObservers(for: window)
         _ = ensureInstalled()
     }
 
+    private func installGeometryObservers(for window: NSWindow) {
+        guard geometryObservers.isEmpty else { return }
+
+        let center = NotificationCenter.default
+        geometryObservers.append(center.addObserver(
+            forName: NSWindow.didResizeNotification,
+            object: window,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.scheduleExternalGeometrySynchronize()
+            }
+        })
+        geometryObservers.append(center.addObserver(
+            forName: NSWindow.didEndLiveResizeNotification,
+            object: window,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.scheduleExternalGeometrySynchronize()
+            }
+        })
+        geometryObservers.append(center.addObserver(
+            forName: NSSplitView.didResizeSubviewsNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] notification in
+            MainActor.assumeIsolated {
+                guard let self,
+                      let splitView = notification.object as? NSSplitView,
+                      let window = self.window,
+                      splitView.window === window else { return }
+                self.scheduleExternalGeometrySynchronize()
+            }
+        })
+    }
+
+    private func removeGeometryObservers() {
+        for observer in geometryObservers {
+            NotificationCenter.default.removeObserver(observer)
+        }
+        geometryObservers.removeAll()
+    }
+
+    private func scheduleExternalGeometrySynchronize() {
+        guard !hasExternalGeometrySyncScheduled else { return }
+        hasExternalGeometrySyncScheduled = true
+        DispatchQueue.main.async { [weak self] in
+            guard let self else { return }
+            self.hasExternalGeometrySyncScheduled = false
+            self.synchronizeAllEntriesFromExternalGeometryChange()
+        }
+    }
+
+    private func synchronizeAllEntriesFromExternalGeometryChange() {
+        guard ensureInstalled() else { return }
+        installedContainerView?.layoutSubtreeIfNeeded()
+        installedReferenceView?.layoutSubtreeIfNeeded()
+        hostView.superview?.layoutSubtreeIfNeeded()
+        hostView.layoutSubtreeIfNeeded()
+        synchronizeAllWebViews(excluding: nil, source: "externalGeometry")
+    }
+
     @discardableResult
     private func ensureInstalled() -> Bool {
         guard let window else { return false }
@@ -419,13 +485,32 @@ final class WindowBrowserPortal: NSObject {
         return false
     }
 
-    private static func rectApproximatelyEqual(_ lhs: NSRect, _ rhs: NSRect, epsilon: CGFloat = 0.5) -> Bool {
+    private static func rectApproximatelyEqual(_ lhs: NSRect, _ rhs: NSRect, epsilon: CGFloat = 0.01) -> Bool {
         abs(lhs.origin.x - rhs.origin.x) <= epsilon &&
             abs(lhs.origin.y - rhs.origin.y) <= epsilon &&
             abs(lhs.size.width - rhs.size.width) <= epsilon &&
             abs(lhs.size.height - rhs.size.height) <= epsilon
     }
 
+    private static func pixelSnappedRect(_ rect: NSRect, in view: NSView) -> NSRect {
+        guard rect.origin.x.isFinite,
+              rect.origin.y.isFinite,
+              rect.size.width.isFinite,
+              rect.size.height.isFinite else {
+            return rect
+        }
+        let scale = max(1.0, view.window?.backingScaleFactor ?? NSScreen.main?.backingScaleFactor ?? 1.0)
+        func snap(_ value: CGFloat) -> CGFloat {
+            (value * scale).rounded(.toNearestOrAwayFromZero) / scale
+        }
+        return NSRect(
+            x: snap(rect.origin.x),
+            y: snap(rect.origin.y),
+            width: max(0, snap(rect.size.width)),
+            height: max(0, snap(rect.size.height))
+        )
+    }
+
     private static func frameExtendsOutsideBounds(_ frame: NSRect, bounds: NSRect, epsilon: CGFloat = 0.5) -> Bool {
         frame.minX < bounds.minX - epsilon ||
             frame.minY < bounds.minY - epsilon ||
@@ -765,7 +850,8 @@ final class WindowBrowserPortal: NSObject {
 
         _ = synchronizeHostFrameToReference()
         let frameInWindow = anchorView.convert(anchorView.bounds, to: nil)
-        let frameInHost = hostView.convert(frameInWindow, from: nil)
+        let frameInHostRaw = hostView.convert(frameInWindow, from: nil)
+        let frameInHost = Self.pixelSnappedRect(frameInHostRaw, in: hostView)
         let hostBounds = hostView.bounds
         let hasFiniteHostBounds =
             hostBounds.origin.x.isFinite &&
@@ -838,6 +924,8 @@ final class WindowBrowserPortal: NSObject {
             CATransaction.setDisableActions(true)
             containerView.frame = targetFrame
             CATransaction.commit()
+            webView.needsLayout = true
+            webView.layoutSubtreeIfNeeded()
         }
 
         let expectedContainerBounds = NSRect(origin: .zero, size: targetFrame.size)
@@ -952,6 +1040,7 @@ final class WindowBrowserPortal: NSObject {
     }
 
     func tearDown() {
+        removeGeometryObservers()
         for webViewId in Array(entriesByWebViewId.keys) {
             detachWebView(withId: webViewId)
         }

Sources/ContentView.swift

@@ -977,14 +977,6 @@ private func commandPaletteWindowOverlayController(for window: NSWindow) -> Wind
     return controller
 }
 
-private struct CommandPaletteRowFramePreferenceKey: PreferenceKey {
-    static var defaultValue: [Int: CGRect] = [:]
-
-    static func reduce(value: inout [Int: CGRect], nextValue: () -> [Int: CGRect]) {
-        value.merge(nextValue(), uniquingKeysWith: { _, rhs in rhs })
-    }
-}
-
 enum WorkspaceMountPolicy {
     // Keep only the selected workspace mounted to minimize layer-tree traversal.
     static let maxMountedWorkspaces = 1
@@ -1120,8 +1112,8 @@ struct ContentView: View {
     @State private var commandPaletteRenameDraft: String = ""
     @State private var commandPaletteSelectedResultIndex: Int = 0
     @State private var commandPaletteHoveredResultIndex: Int?
-    @State private var commandPaletteLastSelectionIndex: Int = 0
-    @State private var commandPaletteRowFrames: [Int: CGRect] = [:]
+    @State private var commandPaletteScrollTargetIndex: Int?
+    @State private var commandPaletteScrollTargetAnchor: UnitPoint?
     @State private var commandPaletteRestoreFocusTarget: CommandPaletteRestoreFocusTarget?
     @State private var commandPaletteUsageHistoryByCommandId: [String: CommandPaletteUsageEntry] = [:]
     @AppStorage(CommandPaletteRenameSelectionSettings.selectAllOnFocusKey)
@@ -1197,11 +1189,6 @@ struct ContentView: View {
         case kind
     }
 
-    enum CommandPaletteScrollAnchor: Equatable {
-        case top
-        case bottom
-    }
-
     private struct CommandPaletteTrailingLabel {
         let text: String
         let style: CommandPaletteTrailingLabelStyle
@@ -1277,6 +1264,10 @@ struct ContentView: View {
         static let panelHasUnread = "panel.hasUnread"
 
         static let updateHasAvailable = "update.hasAvailable"
+
+        static func terminalOpenTargetAvailable(_ target: TerminalDirectoryOpenTarget) -> String {
+            "terminal.openTarget.\(target.rawValue).available"
+        }
     }
 
     private struct CommandPaletteCommandContribution {
@@ -1343,6 +1334,8 @@ struct ContentView: View {
     )
     private static let commandPaletteUsageDefaultsKey = "commandPalette.commandUsage.v1"
     private static let commandPaletteCommandsPrefix = ">"
+    private static let minimumSidebarWidth: CGFloat = 186
+    private static let maximumSidebarWidthRatio: CGFloat = 1.0 / 3.0
 
     private enum SidebarResizerHandle: Hashable {
         case divider
@@ -1352,8 +1345,31 @@ struct ContentView: View {
         SidebarResizeInteraction.hitWidthPerSide
     }
 
-    private var maxSidebarWidth: CGFloat {
-        (NSApp.keyWindow?.screen?.frame.width ?? NSScreen.main?.frame.width ?? 1920) * 2 / 3
+    private func maxSidebarWidth(availableWidth: CGFloat? = nil) -> CGFloat {
+        let resolvedAvailableWidth = availableWidth
+            ?? observedWindow?.contentView?.bounds.width
+            ?? observedWindow?.contentLayoutRect.width
+            ?? NSApp.keyWindow?.contentView?.bounds.width
+            ?? NSApp.keyWindow?.contentLayoutRect.width
+        if let resolvedAvailableWidth, resolvedAvailableWidth > 0 {
+            return max(Self.minimumSidebarWidth, resolvedAvailableWidth * Self.maximumSidebarWidthRatio)
+        }
+
+        let fallbackScreenWidth = NSApp.keyWindow?.screen?.frame.width
+            ?? NSScreen.main?.frame.width
+            ?? 1920
+        return max(Self.minimumSidebarWidth, fallbackScreenWidth * Self.maximumSidebarWidthRatio)
+    }
+
+    private func clampSidebarWidthIfNeeded(availableWidth: CGFloat? = nil) {
+        let nextWidth = max(
+            Self.minimumSidebarWidth,
+            min(maxSidebarWidth(availableWidth: availableWidth), sidebarWidth)
+        )
+        guard abs(nextWidth - sidebarWidth) > 0.5 else { return }
+        withTransaction(Transaction(animation: nil)) {
+            sidebarWidth = nextWidth
+        }
     }
 
     private func activateSidebarResizerCursor() {
@@ -1498,6 +1514,7 @@ struct ContentView: View {
     private func sidebarResizerHandleOverlay(
         _ handle: SidebarResizerHandle,
         width: CGFloat,
+        availableWidth: CGFloat,
         accessibilityIdentifier: String? = nil
     ) -> some View {
         Color.clear
@@ -1543,7 +1560,10 @@ struct ContentView: View {
 
                         activateSidebarResizerCursor()
                         let startWidth = sidebarDragStartWidth ?? sidebarWidth
-                        let nextWidth = max(186, min(maxSidebarWidth, startWidth + value.translation.width))
+                        let nextWidth = max(
+                            Self.minimumSidebarWidth,
+                            min(maxSidebarWidth(availableWidth: availableWidth), startWidth + value.translation.width)
+                        )
                         withTransaction(Transaction(animation: nil)) {
                             sidebarWidth = nextWidth
                         }
@@ -1574,6 +1594,7 @@ struct ContentView: View {
                 sidebarResizerHandleOverlay(
                     .divider,
                     width: sidebarResizerHitWidthPerSide * 2,
+                    availableWidth: totalWidth,
                     accessibilityIdentifier: "SidebarResizer"
                 )
 
@@ -1582,6 +1603,12 @@ struct ContentView: View {
                     .allowsHitTesting(false)
             }
             .frame(width: totalWidth, height: proxy.size.height, alignment: .leading)
+            .onAppear {
+                clampSidebarWidthIfNeeded(availableWidth: totalWidth)
+            }
+            .onChange(of: totalWidth) {
+                clampSidebarWidthIfNeeded(availableWidth: totalWidth)
+            }
         }
     }
 
@@ -1610,7 +1637,11 @@ struct ContentView: View {
                 ForEach(mountedWorkspaces) { tab in
                     let isSelectedWorkspace = selectedWorkspaceId == tab.id
                     let isRetiringWorkspace = retiringWorkspaceId == tab.id
-                    let isInputActive = isSelectedWorkspace || isRetiringWorkspace
+                    // Keep the retiring workspace visible during handoff, but never input-active.
+                    // Allowing both selected+retiring workspaces to be input-active lets the
+                    // old workspace steal first responder (notably with WKWebView), which can
+                    // delay handoff completion and make browser returns feel laggy.
+                    let isInputActive = isSelectedWorkspace
                     let isVisible = isSelectedWorkspace || isRetiringWorkspace
                     let portalPriority = isSelectedWorkspace ? 2 : (isRetiringWorkspace ? 1 : 0)
                     WorkspaceContentView(
@@ -1952,6 +1983,25 @@ struct ContentView: View {
             completeWorkspaceHandoffIfNeeded(focusedTabId: tabId, reason: "first_responder")
         })
 
+        view = AnyView(view.onReceive(NotificationCenter.default.publisher(for: .browserDidBecomeFirstResponderWebView)) { notification in
+            guard let webView = notification.object as? WKWebView,
+                  let selectedTabId = tabManager.selectedTabId,
+                  let selectedWorkspace = tabManager.selectedWorkspace,
+                  let focusedPanelId = selectedWorkspace.focusedPanelId,
+                  let focusedBrowser = selectedWorkspace.browserPanel(for: focusedPanelId),
+                  focusedBrowser.webView === webView else { return }
+            completeWorkspaceHandoffIfNeeded(focusedTabId: selectedTabId, reason: "browser_first_responder")
+        })
+
+        view = AnyView(view.onReceive(NotificationCenter.default.publisher(for: .browserDidFocusAddressBar)) { notification in
+            guard let panelId = notification.object as? UUID,
+                  let selectedTabId = tabManager.selectedTabId,
+                  let selectedWorkspace = tabManager.selectedWorkspace,
+                  selectedWorkspace.focusedPanelId == panelId,
+                  selectedWorkspace.browserPanel(for: panelId) != nil else { return }
+            completeWorkspaceHandoffIfNeeded(focusedTabId: selectedTabId, reason: "browser_address_bar")
+        })
+
         view = AnyView(view.onReceive(tabManager.$tabs) { tabs in
             let existingIds = Set(tabs.map { $0.id })
             if let retiringWorkspaceId, !existingIds.contains(retiringWorkspaceId) {
@@ -2102,6 +2152,13 @@ struct ContentView: View {
             AppDelegate.shared?.fullscreenControlsViewModel = nil
         })
 
+        view = AnyView(view.onReceive(NotificationCenter.default.publisher(for: NSWindow.didResizeNotification)) { notification in
+            guard let window = notification.object as? NSWindow,
+                  window === observedWindow else { return }
+            clampSidebarWidthIfNeeded(availableWidth: window.contentView?.bounds.width ?? window.contentLayoutRect.width)
+            updateSidebarResizerBandState()
+        })
+
         view = AnyView(view.onChange(of: sidebarWidth) { _ in
             updateSidebarResizerBandState()
         })
@@ -2129,6 +2186,7 @@ struct ContentView: View {
                 DispatchQueue.main.async {
                     observedWindow = window
                     isFullScreen = window.styleMask.contains(.fullScreen)
+                    clampSidebarWidthIfNeeded(availableWidth: window.contentView?.bounds.width ?? window.contentLayoutRect.width)
                     syncCommandPaletteDebugStateForObservedWindow()
                     installSidebarResizerPointerMonitorIfNeeded()
                     updateSidebarResizerBandState()
@@ -2377,7 +2435,7 @@ struct ContentView: View {
     private var commandPaletteCommandListView: some View {
         let visibleResults = Array(commandPaletteResults)
         let selectedIndex = commandPaletteSelectedIndex(resultCount: visibleResults.count)
-        let commandPaletteListMaxHeight: CGFloat = 216
+        let commandPaletteListMaxHeight: CGFloat = 450
         let commandPaletteRowHeight: CGFloat = 24
         let commandPaletteEmptyStateHeight: CGFloat = 44
         let commandPaletteListContentHeight = visibleResults.isEmpty
@@ -2421,133 +2479,85 @@ struct ContentView: View {
 
             Divider()
 
-            ScrollViewReader { proxy in
-                ScrollView {
-                    LazyVStack(spacing: 0) {
-                        if visibleResults.isEmpty {
-                            Text(commandPaletteEmptyStateText)
-                                .font(.system(size: 13, weight: .regular))
-                                .foregroundStyle(.secondary)
-                                .frame(maxWidth: .infinity, alignment: .leading)
-                                .padding(.horizontal, 12)
-                                .padding(.vertical, 12)
-                        } else {
-                            ForEach(Array(visibleResults.enumerated()), id: \.element.id) { index, result in
-                                let isSelected = index == selectedIndex
-                                let isHovered = commandPaletteHoveredResultIndex == index
-                                let rowBackground: Color = isSelected
-                                    ? Color.accentColor.opacity(0.12)
-                                    : (isHovered ? Color.primary.opacity(0.08) : .clear)
+            ScrollView {
+                LazyVStack(spacing: 0) {
+                    if visibleResults.isEmpty {
+                        Text(commandPaletteEmptyStateText)
+                            .font(.system(size: 13, weight: .regular))
+                            .foregroundStyle(.secondary)
+                            .frame(maxWidth: .infinity, alignment: .leading)
+                            .padding(.horizontal, 12)
+                            .padding(.vertical, 12)
+                    } else {
+                        ForEach(Array(visibleResults.enumerated()), id: \.element.id) { index, result in
+                            let isSelected = index == selectedIndex
+                            let isHovered = commandPaletteHoveredResultIndex == index
+                            let rowBackground: Color = isSelected
+                                ? Color.accentColor.opacity(0.12)
+                                : (isHovered ? Color.primary.opacity(0.08) : .clear)
 
-                                Button {
-                                    runCommandPaletteCommand(result.command)
-                                } label: {
-                                    HStack(spacing: 8) {
-                                        commandPaletteHighlightedTitleText(
-                                            result.command.title,
-                                            matchedIndices: result.titleMatchIndices
-                                        )
-                                            .font(.system(size: 13, weight: .regular))
-                                            .lineLimit(1)
-                                        Spacer()
-
-                                        if let trailingLabel = commandPaletteTrailingLabel(for: result.command) {
-                                            switch trailingLabel.style {
-                                            case .shortcut:
-                                                Text(trailingLabel.text)
-                                                    .font(.system(size: 11, weight: .medium))
-                                                    .foregroundStyle(.secondary)
-                                                    .padding(.horizontal, 4)
-                                                    .padding(.vertical, 1)
-                                                    .background(Color.primary.opacity(0.08), in: RoundedRectangle(cornerRadius: 4, style: .continuous))
-                                            case .kind:
-                                                Text(trailingLabel.text)
-                                                    .font(.system(size: 11, weight: .regular))
-                                                    .foregroundStyle(.secondary)
-                                                    .lineLimit(1)
-                                            }
-                                        }
-                                    }
-                                    .padding(.horizontal, 9)
-                                    .padding(.vertical, 2)
-                                    .frame(maxWidth: .infinity, alignment: .leading)
-                                    .background(rowBackground)
-                                    .background(
-                                        GeometryReader { geometry in
-                                            Color.clear.preference(
-                                                key: CommandPaletteRowFramePreferenceKey.self,
-                                                value: [index: geometry.frame(in: .named("commandPaletteListScroll"))]
-                                            )
-                                        }
+                            Button {
+                                runCommandPaletteCommand(result.command)
+                            } label: {
+                                HStack(spacing: 8) {
+                                    commandPaletteHighlightedTitleText(
+                                        result.command.title,
+                                        matchedIndices: result.titleMatchIndices
                                     )
-                                    .contentShape(Rectangle())
-                                }
-                                .buttonStyle(.plain)
-                                .id(index)
-                                .onHover { hovering in
-                                    if hovering {
-                                        commandPaletteHoveredResultIndex = index
-                                    } else if commandPaletteHoveredResultIndex == index {
-                                        commandPaletteHoveredResultIndex = nil
+                                        .font(.system(size: 13, weight: .regular))
+                                        .lineLimit(1)
+                                    Spacer()
+
+                                    if let trailingLabel = commandPaletteTrailingLabel(for: result.command) {
+                                        switch trailingLabel.style {
+                                        case .shortcut:
+                                            Text(trailingLabel.text)
+                                                .font(.system(size: 11, weight: .medium))
+                                                .foregroundStyle(.secondary)
+                                                .padding(.horizontal, 4)
+                                                .padding(.vertical, 1)
+                                                .background(Color.primary.opacity(0.08), in: RoundedRectangle(cornerRadius: 4, style: .continuous))
+                                        case .kind:
+                                            Text(trailingLabel.text)
+                                                .font(.system(size: 11, weight: .regular))
+                                                .foregroundStyle(.secondary)
+                                                .lineLimit(1)
+                                        }
                                     }
                                 }
+                                .padding(.horizontal, 9)
+                                .padding(.vertical, 2)
+                                .frame(maxWidth: .infinity, alignment: .leading)
+                                .background(rowBackground)
+                                .contentShape(Rectangle())
+                            }
+                            .buttonStyle(.plain)
+                            .id(index)
+                            .onHover { hovering in
+                                if hovering {
+                                    commandPaletteHoveredResultIndex = index
+                                } else if commandPaletteHoveredResultIndex == index {
+                                    commandPaletteHoveredResultIndex = nil
+                                }
                             }
                         }
                     }
-                    // Force a fresh row tree per query so rendered labels/actions stay in lockstep.
-                    .id(commandPaletteQuery)
-                }
-                .coordinateSpace(name: "commandPaletteListScroll")
-                .frame(height: commandPaletteListHeight)
-                .onChange(of: commandPaletteSelectedResultIndex) { _ in
-                    guard !visibleResults.isEmpty else { return }
-                    let index = commandPaletteSelectedIndex(resultCount: visibleResults.count)
-                    let previousIndex = commandPaletteLastSelectionIndex
-                    defer { commandPaletteLastSelectionIndex = index }
-
-                    guard let anchorDecision = Self.commandPaletteScrollAnchor(
-                        selectedIndex: index,
-                        previousIndex: previousIndex,
-                        resultCount: visibleResults.count,
-                        selectedFrame: commandPaletteRowFrames[index],
-                        viewportHeight: commandPaletteListHeight,
-                        contentHeight: commandPaletteListContentHeight
-                    ) else { return }
-
-                    let anchor: UnitPoint
-                    switch anchorDecision {
-                    case .top:
-                        anchor = .top
-                    case .bottom:
-                        anchor = .bottom
-                    }
-                    DispatchQueue.main.async {
-                        withAnimation(.easeOut(duration: 0.1)) {
-                            proxy.scrollTo(index, anchor: anchor)
-                        }
-                    }
-                }
-                .onChange(of: visibleResults.count) { _ in
-                    commandPaletteLastSelectionIndex = commandPaletteSelectedIndex(resultCount: visibleResults.count)
-                }
-                .onPreferenceChange(CommandPaletteRowFramePreferenceKey.self) { frames in
-                    commandPaletteRowFrames = frames
-                    guard !visibleResults.isEmpty else { return }
-                    let index = commandPaletteSelectedIndex(resultCount: visibleResults.count)
-                    guard let anchorDecision = Self.commandPaletteEdgeVisibilityCorrectionAnchor(
-                        selectedIndex: index,
-                        resultCount: visibleResults.count,
-                        selectedFrame: frames[index],
-                        viewportHeight: commandPaletteListHeight,
-                        contentHeight: commandPaletteListContentHeight
-                    ) else { return }
-                    let anchor: UnitPoint = anchorDecision == .top ? .top : .bottom
-                    DispatchQueue.main.async {
-                        withAnimation(.easeOut(duration: 0.08)) {
-                            proxy.scrollTo(index, anchor: anchor)
-                        }
-                    }
                 }
+                .scrollTargetLayout()
+                // Force a fresh row tree per query so rendered labels/actions stay in lockstep.
+                .id(commandPaletteQuery)
+            }
+            .frame(height: commandPaletteListHeight)
+            .scrollPosition(
+                id: Binding(
+                    get: { commandPaletteScrollTargetIndex },
+                    // Ignore passive readback so manual scrolling doesn't mutate selection-follow state.
+                    set: { _ in }
+                ),
+                anchor: commandPaletteScrollTargetAnchor
+            )
+            .onChange(of: commandPaletteSelectedResultIndex) { _ in
+                updateCommandPaletteScrollTarget(resultCount: visibleResults.count, animated: true)
             }
 
             // Keep Esc-to-close behavior without showing footer controls.
@@ -2562,20 +2572,19 @@ struct ContentView: View {
         }
         .onAppear {
             commandPaletteHoveredResultIndex = nil
-            commandPaletteLastSelectionIndex = commandPaletteSelectedResultIndex
-            commandPaletteRowFrames = [:]
+            updateCommandPaletteScrollTarget(resultCount: visibleResults.count, animated: false)
             resetCommandPaletteSearchFocus()
         }
         .onChange(of: commandPaletteQuery) { _ in
             commandPaletteSelectedResultIndex = 0
             commandPaletteHoveredResultIndex = nil
-            commandPaletteLastSelectionIndex = 0
-            commandPaletteRowFrames = [:]
+            commandPaletteScrollTargetIndex = nil
+            commandPaletteScrollTargetAnchor = nil
             syncCommandPaletteDebugStateForObservedWindow()
         }
         .onChange(of: visibleResults.count) { _ in
             commandPaletteSelectedResultIndex = commandPaletteSelectedIndex(resultCount: visibleResults.count)
-            commandPaletteLastSelectionIndex = commandPaletteSelectedResultIndex
+            updateCommandPaletteScrollTarget(resultCount: visibleResults.count, animated: false)
             if let hoveredIndex = commandPaletteHoveredResultIndex, hoveredIndex >= visibleResults.count {
                 commandPaletteHoveredResultIndex = nil
             }
@@ -3178,18 +3187,29 @@ struct ContentView: View {
         if let panelContext = focusedPanelContext {
             let workspace = panelContext.workspace
             let panelId = panelContext.panelId
+            let panelIsTerminal = panelContext.panel.panelType == .terminal
             snapshot.setBool(CommandPaletteContextKeys.hasFocusedPanel, true)
             snapshot.setString(
                 CommandPaletteContextKeys.panelName,
                 panelDisplayName(workspace: workspace, panelId: panelId, fallback: panelContext.panel.displayTitle)
             )
             snapshot.setBool(CommandPaletteContextKeys.panelIsBrowser, panelContext.panel.panelType == .browser)
-            snapshot.setBool(CommandPaletteContextKeys.panelIsTerminal, panelContext.panel.panelType == .terminal)
+            snapshot.setBool(CommandPaletteContextKeys.panelIsTerminal, panelIsTerminal)
             snapshot.setBool(CommandPaletteContextKeys.panelHasCustomName, workspace.panelCustomTitles[panelId] != nil)
             snapshot.setBool(CommandPaletteContextKeys.panelShouldPin, !workspace.isPanelPinned(panelId))
             let hasUnread = workspace.manualUnreadPanelIds.contains(panelId)
                 || notificationStore.hasUnreadNotification(forTabId: workspace.id, surfaceId: panelId)
             snapshot.setBool(CommandPaletteContextKeys.panelHasUnread, hasUnread)
+
+            if panelIsTerminal {
+                let availableTargets = TerminalDirectoryOpenTarget.cachedLiveAvailableTargets
+                for target in TerminalDirectoryOpenTarget.commandPaletteShortcutTargets {
+                    snapshot.setBool(
+                        CommandPaletteContextKeys.terminalOpenTargetAvailable(target),
+                        availableTargets.contains(target)
+                    )
+                }
+            }
         }
 
         if case .updateAvailable = updateViewModel.effectiveState {
@@ -3600,15 +3620,20 @@ struct ContentView: View {
             )
         )
 
-        contributions.append(
-            CommandPaletteCommandContribution(
-                commandId: "palette.terminalOpenDirectory",
-                title: constant("Open Current Directory in IDE"),
-                subtitle: terminalPanelSubtitle,
-                keywords: ["terminal", "directory", "open", "ide", "code", "default app"],
-                when: { $0.bool(CommandPaletteContextKeys.panelIsTerminal) }
+        for target in TerminalDirectoryOpenTarget.commandPaletteShortcutTargets {
+            contributions.append(
+                CommandPaletteCommandContribution(
+                    commandId: target.commandPaletteCommandId,
+                    title: constant(target.commandPaletteTitle),
+                    subtitle: terminalPanelSubtitle,
+                    keywords: target.commandPaletteKeywords,
+                    when: { context in
+                        context.bool(CommandPaletteContextKeys.panelIsTerminal)
+                            && context.bool(CommandPaletteContextKeys.terminalOpenTargetAvailable(target))
+                    }
+                )
             )
-        )
+        }
         contributions.append(
             CommandPaletteCommandContribution(
                 commandId: "palette.terminalFind",
@@ -3871,9 +3896,11 @@ struct ContentView: View {
             _ = tabManager.createBrowserSplit(direction: .right, url: url)
         }
 
-        registry.register(commandId: "palette.terminalOpenDirectory") {
-            if !openFocusedDirectoryInDefaultApp() {
-                NSSound.beep()
+        for target in TerminalDirectoryOpenTarget.commandPaletteShortcutTargets {
+            registry.register(commandId: target.commandPaletteCommandId) {
+                if !openFocusedDirectory(in: target) {
+                    NSSound.beep()
+                }
             }
         }
         registry.register(commandId: "palette.terminalFind") {
@@ -3937,61 +3964,43 @@ struct ContentView: View {
         return min(max(commandPaletteSelectedResultIndex, 0), resultCount - 1)
     }
 
-    static func commandPaletteScrollAnchor(
+    static func commandPaletteScrollPositionAnchor(
         selectedIndex: Int,
-        previousIndex: Int,
-        resultCount: Int,
-        selectedFrame: CGRect?,
-        viewportHeight: CGFloat,
-        contentHeight: CGFloat,
-        epsilon: CGFloat = 0.5
-    ) -> CommandPaletteScrollAnchor? {
+        resultCount: Int
+    ) -> UnitPoint? {
         guard resultCount > 0 else { return nil }
-        guard contentHeight > viewportHeight else { return nil }
-
-        // Always pin edges exactly into view when selection reaches first/last.
         if selectedIndex <= 0 {
-            return .top
+            return UnitPoint.top
         }
         if selectedIndex >= resultCount - 1 {
-            return .bottom
+            return UnitPoint.bottom
         }
-
-        if let frame = selectedFrame,
-           frame.minY >= (0 - epsilon),
-           frame.maxY <= (viewportHeight + epsilon) {
-            return nil
-        }
-
-        return selectedIndex >= previousIndex ? .bottom : .top
+        return nil
     }
 
-    static func commandPaletteEdgeVisibilityCorrectionAnchor(
-        selectedIndex: Int,
-        resultCount: Int,
-        selectedFrame: CGRect?,
-        viewportHeight: CGFloat,
-        contentHeight: CGFloat,
-        epsilon: CGFloat = 0.5
-    ) -> CommandPaletteScrollAnchor? {
-        guard resultCount > 0 else { return nil }
-        guard contentHeight > viewportHeight else { return nil }
-
-        let isTop = selectedIndex <= 0
-        let isBottom = selectedIndex >= (resultCount - 1)
-        guard isTop || isBottom else { return nil }
-
-        guard let frame = selectedFrame else {
-            return isTop ? .top : .bottom
+    private func updateCommandPaletteScrollTarget(resultCount: Int, animated: Bool) {
+        guard resultCount > 0 else {
+            commandPaletteScrollTargetIndex = nil
+            commandPaletteScrollTargetAnchor = nil
+            return
         }
 
-        if isTop {
-            let topDelta = abs(frame.minY)
-            return topDelta > epsilon ? .top : nil
-        }
+        let selectedIndex = commandPaletteSelectedIndex(resultCount: resultCount)
+        commandPaletteScrollTargetAnchor = Self.commandPaletteScrollPositionAnchor(
+            selectedIndex: selectedIndex,
+            resultCount: resultCount
+        )
 
-        let bottomDelta = abs(frame.maxY - viewportHeight)
-        return bottomDelta > epsilon ? .bottom : nil
+        let assignTarget = {
+            commandPaletteScrollTargetIndex = selectedIndex
+        }
+        if animated {
+            withAnimation(.easeOut(duration: 0.1)) {
+                assignTarget()
+            }
+        } else {
+            assignTarget()
+        }
     }
 
     private func moveCommandPaletteSelection(by delta: Int) {
@@ -4185,8 +4194,8 @@ struct ContentView: View {
         commandPaletteRenameDraft = ""
         commandPaletteSelectedResultIndex = 0
         commandPaletteHoveredResultIndex = nil
-        commandPaletteLastSelectionIndex = 0
-        commandPaletteRowFrames = [:]
+        commandPaletteScrollTargetIndex = nil
+        commandPaletteScrollTargetAnchor = nil
         resetCommandPaletteSearchFocus()
         syncCommandPaletteDebugStateForObservedWindow()
     }
@@ -4199,8 +4208,8 @@ struct ContentView: View {
         commandPaletteRenameDraft = ""
         commandPaletteSelectedResultIndex = 0
         commandPaletteHoveredResultIndex = nil
-        commandPaletteLastSelectionIndex = 0
-        commandPaletteRowFrames = [:]
+        commandPaletteScrollTargetIndex = nil
+        commandPaletteScrollTargetAnchor = nil
         isCommandPaletteSearchFocused = false
         isCommandPaletteRenameFocused = false
         commandPaletteRestoreFocusTarget = nil
@@ -4427,9 +4436,22 @@ struct ContentView: View {
         return NSWorkspace.shared.open(url)
     }
 
-    private func openFocusedDirectoryInDefaultApp() -> Bool {
+    private func openFocusedDirectory(in target: TerminalDirectoryOpenTarget) -> Bool {
         guard let directoryURL = focusedTerminalDirectoryURL() else { return false }
-        return NSWorkspace.shared.open(directoryURL)
+        return openFocusedDirectory(directoryURL, in: target)
+    }
+
+    private func openFocusedDirectory(_ directoryURL: URL, in target: TerminalDirectoryOpenTarget) -> Bool {
+        switch target {
+        case .finder:
+            NSWorkspace.shared.selectFile(nil, inFileViewerRootedAtPath: directoryURL.path)
+            return true
+        default:
+            guard let applicationURL = target.applicationURL() else { return false }
+            let configuration = NSWorkspace.OpenConfiguration()
+            NSWorkspace.shared.open([directoryURL], withApplicationAt: applicationURL, configuration: configuration)
+            return true
+        }
     }
 
     private func focusedTerminalDirectoryURL() -> URL? {

Sources/GhosttyTerminalView.swift

@@ -1501,6 +1501,17 @@ final class TerminalSurface: Identifiable, ObservableObject {
     }
     #endif
 
+    /// Match upstream Ghostty AppKit sizing: framebuffer dimensions are derived
+    /// from backing-space points and truncated (never rounded up).
+    private func pixelDimension(from value: CGFloat) -> UInt32 {
+        guard value.isFinite else { return 0 }
+        let floored = floor(max(0, value))
+        if floored >= CGFloat(UInt32.max) {
+            return UInt32.max
+        }
+        return UInt32(floored)
+    }
+
     private func scaleFactors(for view: GhosttyNSView) -> (x: CGFloat, y: CGFloat, layer: CGFloat) {
         let scale = max(
             1.0,
@@ -1616,6 +1627,13 @@ final class TerminalSurface: Identifiable, ObservableObject {
         surfaceCallbackContext = callbackContext
         surfaceConfig.scale_factor = scaleFactors.layer
         surfaceConfig.context = surfaceContext
+#if DEBUG
+        let templateFontText = String(format: "%.2f", surfaceConfig.font_size)
+        dlog(
+            "zoom.create surface=\(id.uuidString.prefix(5)) context=\(cmuxSurfaceContextName(surfaceContext)) " +
+            "templateFont=\(templateFontText)"
+        )
+#endif
         var envVars: [ghostty_env_var_s] = []
         var envStorage: [(UnsafeMutablePointer<CChar>, UnsafeMutablePointer<CChar>)] = []
         defer {
@@ -1761,6 +1779,7 @@ final class TerminalSurface: Identifiable, ObservableObject {
             #endif
             return
         }
+        guard let createdSurface = surface else { return }
 
         // For vsync-driven rendering, Ghostty needs to know which display we're on so it can
         // start a CVDisplayLink with the right refresh rate. If we don't set this early, the
@@ -1772,29 +1791,66 @@ final class TerminalSurface: Identifiable, ObservableObject {
         if let screen = view.window?.screen ?? NSScreen.main,
            let displayID = screen.displayID,
            displayID != 0 {
-            ghostty_surface_set_display_id(surface, displayID)
+            ghostty_surface_set_display_id(createdSurface, displayID)
         }
 
-        ghostty_surface_set_content_scale(surface, scaleFactors.x, scaleFactors.y)
-        let wpx = UInt32((view.bounds.width * scaleFactors.x).rounded(.toNearestOrAwayFromZero))
-        let hpx = UInt32((view.bounds.height * scaleFactors.y).rounded(.toNearestOrAwayFromZero))
+        ghostty_surface_set_content_scale(createdSurface, scaleFactors.x, scaleFactors.y)
+        let backingSize = view.convertToBacking(NSRect(origin: .zero, size: view.bounds.size)).size
+        let wpx = pixelDimension(from: backingSize.width)
+        let hpx = pixelDimension(from: backingSize.height)
         if wpx > 0, hpx > 0 {
-            ghostty_surface_set_size(surface, wpx, hpx)
+            ghostty_surface_set_size(createdSurface, wpx, hpx)
             lastPixelWidth = wpx
             lastPixelHeight = hpx
             lastXScale = scaleFactors.x
             lastYScale = scaleFactors.y
         }
 
+        // Some GhosttyKit builds can drop inherited font_size during post-create
+        // config/scale reconciliation. If runtime points don't match the inherited
+        // template points, re-apply via binding action so all creation paths
+        // (new surface, split, new workspace) preserve zoom from the source terminal.
+        if let inheritedFontPoints = configTemplate?.font_size,
+           inheritedFontPoints > 0 {
+            let currentFontPoints = cmuxCurrentSurfaceFontSizePoints(createdSurface)
+            let shouldReapply = {
+                guard let currentFontPoints else { return true }
+                return abs(currentFontPoints - inheritedFontPoints) > 0.05
+            }()
+            if shouldReapply {
+                let action = String(format: "set_font_size:%.3f", inheritedFontPoints)
+                _ = performBindingAction(action)
+            }
+        }
+
         flushPendingTextIfNeeded()
+
+#if DEBUG
+        let runtimeFontText = cmuxCurrentSurfaceFontSizePoints(createdSurface).map {
+            String(format: "%.2f", $0)
+        } ?? "nil"
+        dlog(
+            "zoom.create.done surface=\(id.uuidString.prefix(5)) context=\(cmuxSurfaceContextName(surfaceContext)) " +
+            "runtimeFont=\(runtimeFontText)"
+        )
+#endif
     }
 
-    func updateSize(width: CGFloat, height: CGFloat, xScale: CGFloat, yScale: CGFloat, layerScale: CGFloat) {
+    func updateSize(
+        width: CGFloat,
+        height: CGFloat,
+        xScale: CGFloat,
+        yScale: CGFloat,
+        layerScale: CGFloat,
+        backingSize: CGSize? = nil
+    ) {
         guard let surface = surface else { return }
         _ = layerScale
 
-        let wpx = UInt32((width * xScale).rounded(.toNearestOrAwayFromZero))
-        let hpx = UInt32((height * yScale).rounded(.toNearestOrAwayFromZero))
+        let resolvedBackingWidth = backingSize?.width ?? (width * xScale)
+        let resolvedBackingHeight = backingSize?.height ?? (height * yScale)
+        let wpx = pixelDimension(from: resolvedBackingWidth)
+        let hpx = pixelDimension(from: resolvedBackingHeight)
         guard wpx > 0, hpx > 0 else { return }
 
         let scaleChanged = !scaleApproximatelyEqual(xScale, lastXScale) || !scaleApproximatelyEqual(yScale, lastYScale)
@@ -2079,6 +2135,8 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
     private func setup() {
         // Only enable our instrumented CAMetalLayer in targeted debug/test scenarios.
         // The lock in GhosttyMetalLayer.nextDrawable() adds overhead we don't want in normal runs.
+        wantsLayer = true
+        layer?.masksToBounds = true
         installEventMonitor()
         updateTrackingAreas()
         registerForDraggedTypes(Array(Self.dropTypes))
@@ -2206,17 +2264,11 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
             ghostty_surface_set_display_id(surface, displayID)
         }
 
-        // Recompute from current bounds after layout, not stale pending sizes.
+        // Recompute from current bounds after layout. Pending size is only a fallback
+        // when we don't have usable bounds (e.g. detached/off-window transitions).
         superview?.layoutSubtreeIfNeeded()
         layoutSubtreeIfNeeded()
-        let targetSize: CGSize = {
-            let current = bounds.size
-            if current.width > 0, current.height > 0 {
-                return current
-            }
-            return pendingSurfaceSize ?? current
-        }()
-        updateSurfaceSize(size: targetSize)
+        updateSurfaceSize()
         applySurfaceBackground()
         applySurfaceColorScheme(force: true)
         applyWindowBackgroundIfActive()
@@ -2256,9 +2308,30 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
 
     override var isOpaque: Bool { false }
 
+    private func resolvedSurfaceSize(preferred size: CGSize?) -> CGSize {
+        if let size,
+           size.width > 0,
+           size.height > 0 {
+            return size
+        }
+
+        let currentBounds = bounds.size
+        if currentBounds.width > 0, currentBounds.height > 0 {
+            return currentBounds
+        }
+
+        if let pending = pendingSurfaceSize,
+           pending.width > 0,
+           pending.height > 0 {
+            return pending
+        }
+
+        return currentBounds
+    }
+
     private func updateSurfaceSize(size: CGSize? = nil) {
         guard let terminalSurface = terminalSurface else { return }
-        let size = size ?? bounds.size
+        let size = resolvedSurfaceSize(preferred: size)
         guard size.width > 0 && size.height > 0 else {
 #if DEBUG
             let signature = "nonPositive-\(Int(size.width))x\(Int(size.height))"
@@ -2318,12 +2391,17 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
         let xScale = backingSize.width / size.width
         let yScale = backingSize.height / size.height
         let layerScale = max(1.0, window.backingScaleFactor)
+        let drawablePixelSize = CGSize(
+            width: floor(max(0, backingSize.width)),
+            height: floor(max(0, backingSize.height))
+        )
 
         CATransaction.begin()
         CATransaction.setDisableActions(true)
         layer?.contentsScale = layerScale
+        layer?.masksToBounds = true
         if let metalLayer = layer as? CAMetalLayer {
-            metalLayer.drawableSize = backingSize
+            metalLayer.drawableSize = drawablePixelSize
         }
         CATransaction.commit()
 
@@ -2332,9 +2410,9 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
             height: size.height,
             xScale: xScale,
             yScale: yScale,
-            layerScale: layerScale
+            layerScale: layerScale,
+            backingSize: backingSize
         )
-        pendingSurfaceSize = nil
     }
 
     fileprivate func pushTargetSurfaceSize(_ size: CGSize) {
@@ -3524,6 +3602,8 @@ final class GhosttySurfaceScrollView: NSView {
         documentView.addSubview(surfaceView)
 
         super.init(frame: .zero)
+        wantsLayer = true
+        layer?.masksToBounds = true
 
         backgroundView.wantsLayer = true
         backgroundView.layer?.backgroundColor =
@@ -3661,6 +3741,12 @@ final class GhosttySurfaceScrollView: NSView {
         synchronizeGeometryAndContent()
     }
 
+    /// Request an immediate terminal redraw after geometry updates so stale IOSurface
+    /// contents do not remain stretched during live resize churn.
+    func refreshSurfaceNow() {
+        surfaceView.terminalSurface?.forceRefresh()
+    }
+
     private func synchronizeGeometryAndContent() {
         CATransaction.begin()
         CATransaction.setDisableActions(true)
@@ -3670,7 +3756,6 @@ final class GhosttySurfaceScrollView: NSView {
         scrollView.frame = bounds
         let targetSize = scrollView.bounds.size
         surfaceView.frame.size = targetSize
-        surfaceView.pushTargetSurfaceSize(targetSize)
         documentView.frame.size.width = scrollView.bounds.width
         inactiveOverlayView.frame = bounds
         if let zone = activeDropZone {
@@ -3694,6 +3779,7 @@ final class GhosttySurfaceScrollView: NSView {
         updateFlashPath()
         synchronizeScrollView()
         synchronizeSurfaceView()
+        synchronizeCoreSurface()
     }
 
     override func viewDidMoveToWindow() {
@@ -3713,8 +3799,13 @@ final class GhosttySurfaceScrollView: NSView {
             object: window,
             queue: .main
         ) { [weak self] _ in
-            // No-op: focus is driven by first-responder changes.
-            _ = self
+            guard let self, let window = self.window else { return }
+            // Losing key window does not always trigger first-responder resignation, so force
+            // the focused terminal view to yield responder to keep Ghostty cursor/focus state in sync.
+            if let fr = window.firstResponder as? NSView,
+               fr === self.surfaceView || fr.isDescendant(of: self.surfaceView) {
+                window.makeFirstResponder(nil)
+            }
         })
         if window.isKeyWindow { applyFirstResponderIfNeeded() }
     }
@@ -4566,6 +4657,15 @@ final class GhosttySurfaceScrollView: NSView {
         surfaceView.frame.origin = visibleRect.origin
     }
 
+    /// Match upstream Ghostty behavior: use content area width (excluding non-content
+    /// regions such as scrollbar space) when telling libghostty the terminal size.
+    private func synchronizeCoreSurface() {
+        let width = scrollView.contentSize.width
+        let height = surfaceView.frame.height
+        guard width > 0, height > 0 else { return }
+        surfaceView.pushTargetSurfaceSize(CGSize(width: width, height: height))
+    }
+
     private func updateNotificationRingPath() {
         updateOverlayRingPath(
             layer: notificationRingLayer,

Sources/Panels/BrowserPanel.swift

@@ -380,6 +380,21 @@ func browserPreparedNavigationRequest(_ request: URLRequest) -> URLRequest {
     return preparedRequest
 }
 
+private let browserEmbeddedNavigationSchemes: Set<String> = [
+    "about",
+    "applewebdata",
+    "blob",
+    "data",
+    "http",
+    "https",
+    "javascript",
+]
+
+func browserShouldOpenURLExternally(_ url: URL) -> Bool {
+    guard let scheme = url.scheme?.lowercased(), !scheme.isEmpty else { return false }
+    return !browserEmbeddedNavigationSchemes.contains(scheme)
+}
+
 enum BrowserUserAgentSettings {
     // Force a Safari UA. Some WebKit builds return a minimal UA without Version/Safari tokens,
     // and some installs may have legacy Chrome UA overrides. Both can cause Google to serve
@@ -2638,6 +2653,22 @@ private class BrowserNavigationDelegate: NSObject, WKNavigationDelegate {
             return
         }
 
+        // WebKit cannot open app-specific deeplinks (discord://, slack://, zoommtg://, etc.).
+        // Hand these off to macOS so the owning app can handle them.
+        if let url = navigationAction.request.url,
+           navigationAction.targetFrame?.isMainFrame != false,
+           browserShouldOpenURLExternally(url) {
+            let opened = NSWorkspace.shared.open(url)
+            if !opened {
+                NSLog("BrowserPanel external navigation failed to open URL: %@", url.absoluteString)
+            }
+            #if DEBUG
+            dlog("browser.navigation.external source=navDelegate opened=\(opened ? 1 : 0) url=\(url.absoluteString)")
+            #endif
+            decisionHandler(.cancel)
+            return
+        }
+
         // target=_blank or window.open() — navigate in the current webview
         if navigationAction.targetFrame == nil,
            navigationAction.request.url != nil {
@@ -2761,6 +2792,16 @@ private class BrowserUIDelegate: NSObject, WKUIDelegate {
         windowFeatures: WKWindowFeatures
     ) -> WKWebView? {
         if let url = navigationAction.request.url {
+            if browserShouldOpenURLExternally(url) {
+                let opened = NSWorkspace.shared.open(url)
+                if !opened {
+                    NSLog("BrowserPanel external navigation failed to open URL: %@", url.absoluteString)
+                }
+                #if DEBUG
+                dlog("browser.navigation.external source=uiDelegate opened=\(opened ? 1 : 0) url=\(url.absoluteString)")
+                #endif
+                return nil
+            }
             if let requestNavigation {
                 let intent: BrowserInsecureHTTPNavigationIntent =
                     navigationAction.modifierFlags.contains(.command) ? .newTab : .currentTab

Sources/Panels/BrowserPanelView.swift

@@ -3070,6 +3070,7 @@ struct WebViewRepresentable: NSViewRepresentable {
         coordinator: Coordinator,
         generation: Int
     ) {
+        let retryInterval: TimeInterval = 1.0 / 60.0
         // Don't schedule multiple overlapping retries.
         guard coordinator.attachRetryWorkItem == nil else { return }
 
@@ -3102,7 +3103,7 @@ struct WebViewRepresentable: NSViewRepresentable {
                 // Be generous here: bonsplit structural updates can keep a representable
                 // container off-window longer than a few seconds under load.
                 if coordinator.attachRetryCount < 400 {
-                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.05) {
+                    DispatchQueue.main.asyncAfter(deadline: .now() + retryInterval) {
                         scheduleAttachRetry(
                             webView,
                             panel: panel,
@@ -3139,7 +3140,7 @@ struct WebViewRepresentable: NSViewRepresentable {
         }
 
         coordinator.attachRetryWorkItem = work
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.05, execute: work)
+        DispatchQueue.main.asyncAfter(deadline: .now() + retryInterval, execute: work)
     }
 
     func updateNSView(_ nsView: NSView, context: Context) {

Sources/Panels/CmuxWebView.swift

@@ -45,6 +45,9 @@ final class CmuxWebView: WKWebView {
             return false
         }
         let result = super.becomeFirstResponder()
+        if result {
+            NotificationCenter.default.post(name: .browserDidBecomeFirstResponderWebView, object: self)
+        }
 #if DEBUG
         let eventType = NSApp.currentEvent.map { String(describing: $0.type) } ?? "nil"
         dlog(

Sources/TabManager.swift

@@ -753,9 +753,15 @@ class TabManager: ObservableObject {
     @discardableResult
     func addWorkspace(workingDirectory overrideWorkingDirectory: String? = nil, select: Bool = true) -> Workspace {
         let workingDirectory = normalizedWorkingDirectory(overrideWorkingDirectory) ?? preferredWorkingDirectoryForNewTab()
+        let inheritedConfig = inheritedTerminalConfigForNewWorkspace()
         let ordinal = Self.nextPortOrdinal
         Self.nextPortOrdinal += 1
-        let newWorkspace = Workspace(title: "Terminal \(tabs.count + 1)", workingDirectory: workingDirectory, portOrdinal: ordinal)
+        let newWorkspace = Workspace(
+            title: "Terminal \(tabs.count + 1)",
+            workingDirectory: workingDirectory,
+            portOrdinal: ordinal,
+            configTemplate: inheritedConfig
+        )
         wireClosedBrowserTracking(for: newWorkspace)
         let insertIndex = newTabInsertIndex()
         if insertIndex >= 0 && insertIndex <= tabs.count {
@@ -785,6 +791,36 @@ class TabManager: ObservableObject {
     @discardableResult
     func addTab(select: Bool = true) -> Workspace { addWorkspace(select: select) }
 
+    func terminalPanelForWorkspaceConfigInheritanceSource() -> TerminalPanel? {
+        guard let workspace = selectedWorkspace else { return nil }
+        if let focusedTerminal = workspace.focusedTerminalPanel {
+            return focusedTerminal
+        }
+        if let rememberedTerminal = workspace.lastRememberedTerminalPanelForConfigInheritance() {
+            return rememberedTerminal
+        }
+        if let focusedPaneId = workspace.bonsplitController.focusedPaneId,
+           let paneTerminal = workspace.terminalPanelForConfigInheritance(inPane: focusedPaneId) {
+            return paneTerminal
+        }
+        return workspace.terminalPanelForConfigInheritance()
+    }
+
+    private func inheritedTerminalConfigForNewWorkspace() -> ghostty_surface_config_s? {
+        if let sourceSurface = terminalPanelForWorkspaceConfigInheritanceSource()?.surface.surface {
+            return cmuxInheritedSurfaceConfig(
+                sourceSurface: sourceSurface,
+                context: GHOSTTY_SURFACE_CONTEXT_TAB
+            )
+        }
+        if let fallbackFontPoints = selectedWorkspace?.lastRememberedTerminalFontPointsForConfigInheritance() {
+            var config = ghostty_surface_config_new()
+            config.font_size = fallbackFontPoints
+            return config
+        }
+        return nil
+    }
+
     private func normalizedWorkingDirectory(_ directory: String?) -> String? {
         guard let directory else { return nil }
         let normalized = normalizeDirectory(directory)
@@ -3113,6 +3149,7 @@ extension Notification.Name {
     static let ghosttyDidFocusTab = Notification.Name("ghosttyDidFocusTab")
     static let ghosttyDidFocusSurface = Notification.Name("ghosttyDidFocusSurface")
     static let ghosttyDidBecomeFirstResponderSurface = Notification.Name("ghosttyDidBecomeFirstResponderSurface")
+    static let browserDidBecomeFirstResponderWebView = Notification.Name("browserDidBecomeFirstResponderWebView")
     static let browserFocusAddressBar = Notification.Name("browserFocusAddressBar")
     static let browserMoveOmnibarSelection = Notification.Name("browserMoveOmnibarSelection")
     static let browserDidExitAddressBar = Notification.Name("browserDidExitAddressBar")

Sources/TerminalWindowPortal.swift

@@ -546,6 +546,8 @@ final class WindowTerminalPortal: NSObject {
     private weak var installedReferenceView: NSView?
     private var installConstraints: [NSLayoutConstraint] = []
     private var hasDeferredFullSyncScheduled = false
+    private var hasExternalGeometrySyncScheduled = false
+    private var geometryObservers: [NSObjectProtocol] = []
 #if DEBUG
     private var lastLoggedBonsplitContainerSignature: String?
 #endif
@@ -563,13 +565,141 @@ final class WindowTerminalPortal: NSObject {
     init(window: NSWindow) {
         self.window = window
         super.init()
-        hostView.wantsLayer = false
+        hostView.wantsLayer = true
+        hostView.layer?.masksToBounds = true
+        hostView.postsFrameChangedNotifications = true
+        hostView.postsBoundsChangedNotifications = true
         hostView.translatesAutoresizingMaskIntoConstraints = false
         dividerOverlayView.translatesAutoresizingMaskIntoConstraints = true
         dividerOverlayView.autoresizingMask = [.width, .height]
+        installGeometryObservers(for: window)
         _ = ensureInstalled()
     }
 
+    private func installGeometryObservers(for window: NSWindow) {
+        guard geometryObservers.isEmpty else { return }
+
+        let center = NotificationCenter.default
+        geometryObservers.append(center.addObserver(
+            forName: NSWindow.didResizeNotification,
+            object: window,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.scheduleExternalGeometrySynchronize()
+            }
+        })
+        geometryObservers.append(center.addObserver(
+            forName: NSWindow.didEndLiveResizeNotification,
+            object: window,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.scheduleExternalGeometrySynchronize()
+            }
+        })
+        geometryObservers.append(center.addObserver(
+            forName: NSSplitView.didResizeSubviewsNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] notification in
+            MainActor.assumeIsolated {
+                guard let self,
+                      let splitView = notification.object as? NSSplitView,
+                      let window = self.window,
+                      splitView.window === window else { return }
+                self.scheduleExternalGeometrySynchronize()
+            }
+        })
+        geometryObservers.append(center.addObserver(
+            forName: NSView.frameDidChangeNotification,
+            object: hostView,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.scheduleExternalGeometrySynchronize()
+            }
+        })
+        geometryObservers.append(center.addObserver(
+            forName: NSView.boundsDidChangeNotification,
+            object: hostView,
+            queue: .main
+        ) { [weak self] _ in
+            MainActor.assumeIsolated {
+                self?.scheduleExternalGeometrySynchronize()
+            }
+        })
+    }
+
+    private func removeGeometryObservers() {
+        for observer in geometryObservers {
+            NotificationCenter.default.removeObserver(observer)
+        }
+        geometryObservers.removeAll()
+    }
+
+    private func scheduleExternalGeometrySynchronize() {
+        guard !hasExternalGeometrySyncScheduled else { return }
+        hasExternalGeometrySyncScheduled = true
+        DispatchQueue.main.async { [weak self] in
+            guard let self else { return }
+            self.hasExternalGeometrySyncScheduled = false
+            self.synchronizeAllEntriesFromExternalGeometryChange()
+        }
+    }
+
+    private func synchronizeLayoutHierarchy() {
+        installedContainerView?.layoutSubtreeIfNeeded()
+        installedReferenceView?.layoutSubtreeIfNeeded()
+        hostView.superview?.layoutSubtreeIfNeeded()
+        hostView.layoutSubtreeIfNeeded()
+        _ = synchronizeHostFrameToReference()
+    }
+
+    @discardableResult
+    private func synchronizeHostFrameToReference() -> Bool {
+        guard let container = installedContainerView,
+              let reference = installedReferenceView else {
+            return false
+        }
+        let frameInContainer = container.convert(reference.bounds, from: reference)
+        let hasFiniteFrame =
+            frameInContainer.origin.x.isFinite &&
+            frameInContainer.origin.y.isFinite &&
+            frameInContainer.size.width.isFinite &&
+            frameInContainer.size.height.isFinite
+        guard hasFiniteFrame else { return false }
+
+        if !Self.rectApproximatelyEqual(hostView.frame, frameInContainer) {
+            CATransaction.begin()
+            CATransaction.setDisableActions(true)
+            hostView.frame = frameInContainer
+            CATransaction.commit()
+#if DEBUG
+            dlog(
+                "portal.hostFrame.update host=\(portalDebugToken(hostView)) " +
+                "frame=\(portalDebugFrame(frameInContainer))"
+            )
+#endif
+        }
+        return frameInContainer.width > 1 && frameInContainer.height > 1
+    }
+
+    private func synchronizeAllEntriesFromExternalGeometryChange() {
+        guard ensureInstalled() else { return }
+        synchronizeLayoutHierarchy()
+        synchronizeAllHostedViews(excluding: nil)
+
+        // During live resize, AppKit can deliver frame churn where host/container geometry
+        // settles a tick before the terminal's own scroll/surface hierarchy. Force a final
+        // in-place geometry + surface refresh for all visible entries in this window.
+        for entry in entriesByHostedId.values {
+            guard let hostedView = entry.hostedView, !hostedView.isHidden else { continue }
+            hostedView.reconcileGeometryNow()
+            hostedView.refreshSurfaceNow()
+        }
+    }
+
     private func ensureDividerOverlayOnTop() {
         if dividerOverlayView.superview !== hostView {
             dividerOverlayView.frame = hostView.bounds
@@ -618,6 +748,8 @@ final class WindowTerminalPortal: NSObject {
             container.addSubview(overlay, positioned: .above, relativeTo: hostView)
         }
 
+        synchronizeLayoutHierarchy()
+        _ = synchronizeHostFrameToReference()
         ensureDividerOverlayOnTop()
 
         return true
@@ -647,13 +779,32 @@ final class WindowTerminalPortal: NSObject {
         return false
     }
 
-    private static func rectApproximatelyEqual(_ lhs: NSRect, _ rhs: NSRect, epsilon: CGFloat = 0.5) -> Bool {
+    private static func rectApproximatelyEqual(_ lhs: NSRect, _ rhs: NSRect, epsilon: CGFloat = 0.01) -> Bool {
         abs(lhs.origin.x - rhs.origin.x) <= epsilon &&
             abs(lhs.origin.y - rhs.origin.y) <= epsilon &&
             abs(lhs.size.width - rhs.size.width) <= epsilon &&
             abs(lhs.size.height - rhs.size.height) <= epsilon
     }
 
+    private static func pixelSnappedRect(_ rect: NSRect, in view: NSView) -> NSRect {
+        guard rect.origin.x.isFinite,
+              rect.origin.y.isFinite,
+              rect.size.width.isFinite,
+              rect.size.height.isFinite else {
+            return rect
+        }
+        let scale = max(1.0, view.window?.backingScaleFactor ?? NSScreen.main?.backingScaleFactor ?? 1.0)
+        func snap(_ value: CGFloat) -> CGFloat {
+            (value * scale).rounded(.toNearestOrAwayFromZero) / scale
+        }
+        return NSRect(
+            x: snap(rect.origin.x),
+            y: snap(rect.origin.y),
+            width: max(0, snap(rect.size.width)),
+            height: max(0, snap(rect.size.height))
+        )
+    }
+
     private static func isView(_ view: NSView, above reference: NSView, in container: NSView) -> Bool {
         guard let viewIndex = container.subviews.firstIndex(of: view),
               let referenceIndex = container.subviews.firstIndex(of: reference) else {
@@ -691,6 +842,58 @@ final class WindowTerminalPortal: NSObject {
     }
 #endif
 
+    /// Convert an anchor view's bounds to window coordinates while honoring ancestor clipping.
+    /// SwiftUI/AppKit hosting layers can report an anchor bounds wider than its split pane when
+    /// intrinsic-size content overflows; intersecting through ancestor bounds gives the effective
+    /// visible rect that should drive portal geometry.
+    private func effectiveAnchorFrameInWindow(for anchorView: NSView) -> NSRect {
+        var frameInWindow = anchorView.convert(anchorView.bounds, to: nil)
+        var current = anchorView.superview
+        while let ancestor = current {
+            let ancestorBoundsInWindow = ancestor.convert(ancestor.bounds, to: nil)
+            let finiteAncestorBounds =
+                ancestorBoundsInWindow.origin.x.isFinite &&
+                ancestorBoundsInWindow.origin.y.isFinite &&
+                ancestorBoundsInWindow.size.width.isFinite &&
+                ancestorBoundsInWindow.size.height.isFinite
+            if finiteAncestorBounds {
+                frameInWindow = frameInWindow.intersection(ancestorBoundsInWindow)
+                if frameInWindow.isNull { return .zero }
+            }
+            if ancestor === installedReferenceView { break }
+            current = ancestor.superview
+        }
+        return frameInWindow
+    }
+
+    private func seededFrameInHost(for anchorView: NSView) -> NSRect? {
+        _ = synchronizeHostFrameToReference()
+        let frameInWindow = effectiveAnchorFrameInWindow(for: anchorView)
+        let frameInHostRaw = hostView.convert(frameInWindow, from: nil)
+        let frameInHost = Self.pixelSnappedRect(frameInHostRaw, in: hostView)
+        let hasFiniteFrame =
+            frameInHost.origin.x.isFinite &&
+            frameInHost.origin.y.isFinite &&
+            frameInHost.size.width.isFinite &&
+            frameInHost.size.height.isFinite
+        guard hasFiniteFrame else { return nil }
+
+        let hostBounds = hostView.bounds
+        let hasFiniteHostBounds =
+            hostBounds.origin.x.isFinite &&
+            hostBounds.origin.y.isFinite &&
+            hostBounds.size.width.isFinite &&
+            hostBounds.size.height.isFinite
+        if hasFiniteHostBounds {
+            let clampedFrame = frameInHost.intersection(hostBounds)
+            if !clampedFrame.isNull, clampedFrame.width > 1, clampedFrame.height > 1 {
+                return clampedFrame
+            }
+        }
+
+        return frameInHost
+    }
+
     func detachHostedView(withId hostedId: ObjectIdentifier) {
         guard let entry = entriesByHostedId.removeValue(forKey: hostedId) else { return }
         if let anchor = entry.anchorView {
@@ -782,6 +985,32 @@ final class WindowTerminalPortal: NSObject {
         }
 #endif
 
+        _ = synchronizeHostFrameToReference()
+
+        // Seed frame/bounds before entering the window so a freshly reparented
+        // surface doesn't do a transient 800x600 size update on viewDidMoveToWindow.
+        if let seededFrame = seededFrameInHost(for: anchorView),
+           seededFrame.width > 0,
+           seededFrame.height > 0 {
+            CATransaction.begin()
+            CATransaction.setDisableActions(true)
+            hostedView.frame = seededFrame
+            hostedView.bounds = NSRect(origin: .zero, size: seededFrame.size)
+            CATransaction.commit()
+        } else {
+            // If anchor geometry is still unsettled, keep this hidden/zero-sized until
+            // synchronizeHostedView resolves a valid target frame on the next layout tick.
+            CATransaction.begin()
+            CATransaction.setDisableActions(true)
+            hostedView.frame = .zero
+            hostedView.bounds = .zero
+            CATransaction.commit()
+            hostedView.isHidden = true
+        }
+        // Keep inner scroll/surface geometry in sync with the seeded outer frame
+        // before the hosted view enters a window.
+        hostedView.reconcileGeometryNow()
+
         if hostedView.superview !== hostView {
 #if DEBUG
             dlog(
@@ -807,10 +1036,13 @@ final class WindowTerminalPortal: NSObject {
         ensureDividerOverlayOnTop()
 
         synchronizeHostedView(withId: hostedId)
+        scheduleDeferredFullSynchronizeAll()
         pruneDeadEntries()
     }
 
     func synchronizeHostedViewForAnchor(_ anchorView: NSView) {
+        guard ensureInstalled() else { return }
+        synchronizeLayoutHierarchy()
         pruneDeadEntries()
         let anchorId = ObjectIdentifier(anchorView)
         let primaryHostedId = hostedByAnchorId[anchorId]
@@ -837,6 +1069,7 @@ final class WindowTerminalPortal: NSObject {
 
     private func synchronizeAllHostedViews(excluding hostedIdToSkip: ObjectIdentifier?) {
         guard ensureInstalled() else { return }
+        synchronizeLayoutHierarchy()
         pruneDeadEntries()
         let hostedIds = Array(entriesByHostedId.keys)
         for hostedId in hostedIds {
@@ -879,24 +1112,51 @@ final class WindowTerminalPortal: NSObject {
             return
         }
 
-        let frameInWindow = anchorView.convert(anchorView.bounds, to: nil)
-        let frameInHost = hostView.convert(frameInWindow, from: nil)
+        _ = synchronizeHostFrameToReference()
+        let frameInWindow = effectiveAnchorFrameInWindow(for: anchorView)
+        let frameInHostRaw = hostView.convert(frameInWindow, from: nil)
+        let frameInHost = Self.pixelSnappedRect(frameInHostRaw, in: hostView)
 #if DEBUG
         logBonsplitContainerFrameIfNeeded(anchorView: anchorView, hostedView: hostedView)
 #endif
+        let hostBounds = hostView.bounds
+        let hasFiniteHostBounds =
+            hostBounds.origin.x.isFinite &&
+            hostBounds.origin.y.isFinite &&
+            hostBounds.size.width.isFinite &&
+            hostBounds.size.height.isFinite
+        let hostBoundsReady = hasFiniteHostBounds && hostBounds.width > 1 && hostBounds.height > 1
+        if !hostBoundsReady {
+#if DEBUG
+            dlog(
+                "portal.sync.defer hosted=\(portalDebugToken(hostedView)) " +
+                "reason=hostBoundsNotReady host=\(portalDebugFrame(hostBounds)) " +
+                "anchor=\(portalDebugFrame(frameInHost)) visibleInUI=\(entry.visibleInUI ? 1 : 0)"
+            )
+#endif
+            hostedView.isHidden = true
+            scheduleDeferredFullSynchronizeAll()
+            return
+        }
         let hasFiniteFrame =
             frameInHost.origin.x.isFinite &&
             frameInHost.origin.y.isFinite &&
             frameInHost.size.width.isFinite &&
             frameInHost.size.height.isFinite
+        let clampedFrame = frameInHost.intersection(hostBounds)
+        let hasVisibleIntersection =
+            !clampedFrame.isNull &&
+            clampedFrame.width > 1 &&
+            clampedFrame.height > 1
+        let targetFrame = (hasFiniteFrame && hasVisibleIntersection) ? clampedFrame : frameInHost
         let anchorHidden = Self.isHiddenOrAncestorHidden(anchorView)
         let tinyFrame =
-            frameInHost.width <= Self.tinyHideThreshold ||
-            frameInHost.height <= Self.tinyHideThreshold
+            targetFrame.width <= Self.tinyHideThreshold ||
+            targetFrame.height <= Self.tinyHideThreshold
         let revealReadyForDisplay =
-            frameInHost.width >= Self.minimumRevealWidth &&
-            frameInHost.height >= Self.minimumRevealHeight
-        let outsideHostBounds = !frameInHost.intersects(hostView.bounds)
+            targetFrame.width >= Self.minimumRevealWidth &&
+            targetFrame.height >= Self.minimumRevealHeight
+        let outsideHostBounds = !hasVisibleIntersection
         let shouldHide =
             !entry.visibleInUI ||
             anchorHidden ||
@@ -907,17 +1167,26 @@ final class WindowTerminalPortal: NSObject {
 
         let oldFrame = hostedView.frame
 #if DEBUG
+        let frameWasClamped = hasFiniteFrame && !Self.rectApproximatelyEqual(frameInHost, targetFrame)
+        if frameWasClamped {
+            dlog(
+                "portal.frame.clamp hosted=\(portalDebugToken(hostedView)) " +
+                "anchor=\(portalDebugToken(anchorView)) " +
+                "raw=\(portalDebugFrame(frameInHost)) clamped=\(portalDebugFrame(targetFrame)) " +
+                "host=\(portalDebugFrame(hostBounds))"
+            )
+        }
         let collapsedToTiny = oldFrame.width > 1 && oldFrame.height > 1 && tinyFrame
         let restoredFromTiny = (oldFrame.width <= 1 || oldFrame.height <= 1) && !tinyFrame
         if collapsedToTiny {
             dlog(
                 "portal.frame.collapse hosted=\(portalDebugToken(hostedView)) anchor=\(portalDebugToken(anchorView)) " +
-                "old=\(portalDebugFrame(oldFrame)) new=\(portalDebugFrame(frameInHost))"
+                "old=\(portalDebugFrame(oldFrame)) new=\(portalDebugFrame(targetFrame))"
             )
         } else if restoredFromTiny {
             dlog(
                 "portal.frame.restore hosted=\(portalDebugToken(hostedView)) anchor=\(portalDebugToken(anchorView)) " +
-                "old=\(portalDebugFrame(oldFrame)) new=\(portalDebugFrame(frameInHost))"
+                "old=\(portalDebugFrame(oldFrame)) new=\(portalDebugFrame(targetFrame))"
             )
         }
 #endif
@@ -931,23 +1200,29 @@ final class WindowTerminalPortal: NSObject {
                 "portal.hidden hosted=\(portalDebugToken(hostedView)) value=1 " +
                 "visibleInUI=\(entry.visibleInUI ? 1 : 0) anchorHidden=\(anchorHidden ? 1 : 0) " +
                 "tiny=\(tinyFrame ? 1 : 0) revealReady=\(revealReadyForDisplay ? 1 : 0) finite=\(hasFiniteFrame ? 1 : 0) " +
-                "outside=\(outsideHostBounds ? 1 : 0) frame=\(portalDebugFrame(frameInHost))"
+                "outside=\(outsideHostBounds ? 1 : 0) frame=\(portalDebugFrame(targetFrame)) " +
+                "host=\(portalDebugFrame(hostBounds))"
             )
 #endif
             hostedView.isHidden = true
         }
 
-        if !Self.rectApproximatelyEqual(oldFrame, frameInHost) {
+        if hasFiniteFrame && !Self.rectApproximatelyEqual(oldFrame, targetFrame) {
             CATransaction.begin()
             CATransaction.setDisableActions(true)
-            hostedView.frame = frameInHost
+            hostedView.frame = targetFrame
             CATransaction.commit()
+            hostedView.reconcileGeometryNow()
+            hostedView.refreshSurfaceNow()
+        }
 
-            if abs(oldFrame.size.width - frameInHost.size.width) > 0.5 ||
-                abs(oldFrame.size.height - frameInHost.size.height) > 0.5,
-                !shouldHide,
-                (!hostedView.isHidden || revealReadyForDisplay) {
-                hostedView.reconcileGeometryNow()
+        if hasFiniteFrame {
+            let expectedBounds = NSRect(origin: .zero, size: targetFrame.size)
+            if !Self.rectApproximatelyEqual(hostedView.bounds, expectedBounds) {
+                CATransaction.begin()
+                CATransaction.setDisableActions(true)
+                hostedView.bounds = expectedBounds
+                CATransaction.commit()
             }
         }
 
@@ -968,12 +1243,25 @@ final class WindowTerminalPortal: NSObject {
                 "portal.hidden hosted=\(portalDebugToken(hostedView)) value=0 " +
                 "visibleInUI=\(entry.visibleInUI ? 1 : 0) anchorHidden=\(anchorHidden ? 1 : 0) " +
                 "tiny=\(tinyFrame ? 1 : 0) revealReady=\(revealReadyForDisplay ? 1 : 0) finite=\(hasFiniteFrame ? 1 : 0) " +
-                "outside=\(outsideHostBounds ? 1 : 0) frame=\(portalDebugFrame(frameInHost))"
+                "outside=\(outsideHostBounds ? 1 : 0) frame=\(portalDebugFrame(targetFrame)) " +
+                "host=\(portalDebugFrame(hostBounds))"
             )
 #endif
             hostedView.isHidden = false
         }
 
+#if DEBUG
+        dlog(
+            "portal.sync.result hosted=\(portalDebugToken(hostedView)) " +
+            "anchor=\(portalDebugToken(anchorView)) host=\(portalDebugToken(hostView)) " +
+            "hostWin=\(hostView.window?.windowNumber ?? -1) " +
+            "old=\(portalDebugFrame(oldFrame)) raw=\(portalDebugFrame(frameInHost)) " +
+            "target=\(portalDebugFrame(targetFrame)) hide=\(shouldHide ? 1 : 0) " +
+            "entryVisible=\(entry.visibleInUI ? 1 : 0) hostedHidden=\(hostedView.isHidden ? 1 : 0) " +
+            "hostBounds=\(portalDebugFrame(hostBounds))"
+        )
+#endif
+
         ensureDividerOverlayOnTop()
     }
 
@@ -1007,6 +1295,7 @@ final class WindowTerminalPortal: NSObject {
     }
 
     func tearDown() {
+        removeGeometryObservers()
         for hostedId in Array(entriesByHostedId.keys) {
             detachHostedView(withId: hostedId)
         }

Sources/Workspace.swift

@@ -3,6 +3,58 @@ import SwiftUI
 import AppKit
 import Bonsplit
 import Combine
+import CoreText
+
+func cmuxSurfaceContextName(_ context: ghostty_surface_context_e) -> String {
+    switch context {
+    case GHOSTTY_SURFACE_CONTEXT_WINDOW:
+        return "window"
+    case GHOSTTY_SURFACE_CONTEXT_TAB:
+        return "tab"
+    case GHOSTTY_SURFACE_CONTEXT_SPLIT:
+        return "split"
+    default:
+        return "unknown(\(context))"
+    }
+}
+
+func cmuxCurrentSurfaceFontSizePoints(_ surface: ghostty_surface_t) -> Float? {
+    guard let quicklookFont = ghostty_surface_quicklook_font(surface) else {
+        return nil
+    }
+
+    let ctFont = Unmanaged<CTFont>.fromOpaque(quicklookFont).takeRetainedValue()
+    let points = Float(CTFontGetSize(ctFont))
+    guard points > 0 else { return nil }
+    return points
+}
+
+func cmuxInheritedSurfaceConfig(
+    sourceSurface: ghostty_surface_t,
+    context: ghostty_surface_context_e
+) -> ghostty_surface_config_s {
+    let inherited = ghostty_surface_inherited_config(sourceSurface, context)
+    var config = inherited
+
+    // Make runtime zoom inheritance explicit, even when Ghostty's
+    // inherit-font-size config is disabled.
+    let runtimePoints = cmuxCurrentSurfaceFontSizePoints(sourceSurface)
+    if let points = runtimePoints {
+        config.font_size = points
+    }
+
+#if DEBUG
+    let inheritedText = String(format: "%.2f", inherited.font_size)
+    let runtimeText = runtimePoints.map { String(format: "%.2f", $0) } ?? "nil"
+    let finalText = String(format: "%.2f", config.font_size)
+    dlog(
+        "zoom.inherit context=\(cmuxSurfaceContextName(context)) " +
+        "inherited=\(inheritedText) runtime=\(runtimeText) final=\(finalText)"
+    )
+#endif
+
+    return config
+}
 
 struct SidebarStatusEntry {
     let key: String
@@ -261,6 +313,15 @@ final class Workspace: Identifiable, ObservableObject {
     /// When true, suppresses auto-creation in didSplitPane (programmatic splits handle their own panels)
     private var isProgrammaticSplit = false
 
+    /// Last terminal panel used as an inheritance source (typically last focused terminal).
+    private var lastTerminalConfigInheritancePanelId: UUID?
+    /// Last known terminal font points from inheritance sources. Used as fallback when
+    /// no live terminal surface is currently available.
+    private var lastTerminalConfigInheritanceFontPoints: Float?
+    /// Per-panel inherited zoom lineage. Descendants reuse this root value unless
+    /// a panel is explicitly re-zoomed by the user.
+    private var terminalInheritanceFontPointsByPanelId: [UUID: Float] = [:]
+
     /// Callback used by TabManager to capture recently closed browser panels for Cmd+Shift+T restore.
     var onClosedBrowserPanel: ((ClosedBrowserPanelRestoreSnapshot) -> Void)?
 
@@ -376,7 +437,12 @@ final class Workspace: Identifiable, ObservableObject {
         }
     }
 
-    init(title: String = "Terminal", workingDirectory: String? = nil, portOrdinal: Int = 0) {
+    init(
+        title: String = "Terminal",
+        workingDirectory: String? = nil,
+        portOrdinal: Int = 0,
+        configTemplate: ghostty_surface_config_s? = nil
+    ) {
         self.id = UUID()
         self.portOrdinal = portOrdinal
         self.processTitle = title
@@ -414,11 +480,13 @@ final class Workspace: Identifiable, ObservableObject {
         let terminalPanel = TerminalPanel(
             workspaceId: id,
             context: GHOSTTY_SURFACE_CONTEXT_TAB,
+            configTemplate: configTemplate,
             workingDirectory: hasWorkingDirectory ? trimmedWorkingDirectory : nil,
             portOrdinal: portOrdinal
         )
         panels[terminalPanel.id] = terminalPanel
         panelTitles[terminalPanel.id] = terminalPanel.displayTitle
+        seedTerminalInheritanceFontPoints(panelId: terminalPanel.id, configTemplate: configTemplate)
 
         // Create initial tab in bonsplit and store the mapping
         var initialTabId: TabID?
@@ -919,6 +987,169 @@ final class Workspace: Identifiable, ObservableObject {
 
     // MARK: - Panel Operations
 
+    private func seedTerminalInheritanceFontPoints(
+        panelId: UUID,
+        configTemplate: ghostty_surface_config_s?
+    ) {
+        guard let fontPoints = configTemplate?.font_size, fontPoints > 0 else { return }
+        terminalInheritanceFontPointsByPanelId[panelId] = fontPoints
+        lastTerminalConfigInheritanceFontPoints = fontPoints
+    }
+
+    private func resolvedTerminalInheritanceFontPoints(
+        for terminalPanel: TerminalPanel,
+        sourceSurface: ghostty_surface_t,
+        inheritedConfig: ghostty_surface_config_s
+    ) -> Float? {
+        let runtimePoints = cmuxCurrentSurfaceFontSizePoints(sourceSurface)
+        if let rooted = terminalInheritanceFontPointsByPanelId[terminalPanel.id], rooted > 0 {
+            if let runtimePoints, abs(runtimePoints - rooted) > 0.05 {
+                // Runtime zoom changed after lineage was seeded (manual zoom on descendant);
+                // treat runtime as the new root for future descendants.
+                return runtimePoints
+            }
+            return rooted
+        }
+        if inheritedConfig.font_size > 0 {
+            return inheritedConfig.font_size
+        }
+        return runtimePoints
+    }
+
+    private func rememberTerminalConfigInheritanceSource(_ terminalPanel: TerminalPanel) {
+        lastTerminalConfigInheritancePanelId = terminalPanel.id
+        if let sourceSurface = terminalPanel.surface.surface,
+           let runtimePoints = cmuxCurrentSurfaceFontSizePoints(sourceSurface) {
+            let existing = terminalInheritanceFontPointsByPanelId[terminalPanel.id]
+            if existing == nil || abs((existing ?? runtimePoints) - runtimePoints) > 0.05 {
+                terminalInheritanceFontPointsByPanelId[terminalPanel.id] = runtimePoints
+            }
+            lastTerminalConfigInheritanceFontPoints =
+                terminalInheritanceFontPointsByPanelId[terminalPanel.id] ?? runtimePoints
+        }
+    }
+
+    func lastRememberedTerminalPanelForConfigInheritance() -> TerminalPanel? {
+        guard let panelId = lastTerminalConfigInheritancePanelId else { return nil }
+        return terminalPanel(for: panelId)
+    }
+
+    func lastRememberedTerminalFontPointsForConfigInheritance() -> Float? {
+        lastTerminalConfigInheritanceFontPoints
+    }
+
+    /// Candidate terminal panels used as the source when creating inherited Ghostty config.
+    /// Preference order:
+    /// 1) explicitly preferred terminal panel (when the caller has one),
+    /// 2) selected terminal in the target pane,
+    /// 3) currently focused terminal in the workspace,
+    /// 4) last remembered terminal source,
+    /// 5) first terminal tab in the target pane,
+    /// 6) deterministic workspace fallback.
+    private func terminalPanelConfigInheritanceCandidates(
+        preferredPanelId: UUID? = nil,
+        inPane preferredPaneId: PaneID? = nil
+    ) -> [TerminalPanel] {
+        var candidates: [TerminalPanel] = []
+        var seen: Set<UUID> = []
+
+        func appendCandidate(_ panel: TerminalPanel?) {
+            guard let panel, seen.insert(panel.id).inserted else { return }
+            candidates.append(panel)
+        }
+
+        if let preferredPanelId,
+           let terminalPanel = terminalPanel(for: preferredPanelId) {
+            appendCandidate(terminalPanel)
+        }
+
+        if let preferredPaneId,
+           let selectedSurfaceId = bonsplitController.selectedTab(inPane: preferredPaneId)?.id,
+           let selectedPanelId = panelIdFromSurfaceId(selectedSurfaceId),
+           let selectedTerminalPanel = terminalPanel(for: selectedPanelId) {
+            appendCandidate(selectedTerminalPanel)
+        }
+
+        if let focusedTerminalPanel {
+            appendCandidate(focusedTerminalPanel)
+        }
+
+        if let rememberedTerminalPanel = lastRememberedTerminalPanelForConfigInheritance() {
+            appendCandidate(rememberedTerminalPanel)
+        }
+
+        if let preferredPaneId {
+            for tab in bonsplitController.tabs(inPane: preferredPaneId) {
+                guard let panelId = panelIdFromSurfaceId(tab.id),
+                      let terminalPanel = terminalPanel(for: panelId) else { continue }
+                appendCandidate(terminalPanel)
+            }
+        }
+
+        for terminalPanel in panels.values
+            .compactMap({ $0 as? TerminalPanel })
+            .sorted(by: { $0.id.uuidString < $1.id.uuidString }) {
+            appendCandidate(terminalPanel)
+        }
+
+        return candidates
+    }
+
+    /// Picks the first terminal panel candidate used as the inheritance source.
+    func terminalPanelForConfigInheritance(
+        preferredPanelId: UUID? = nil,
+        inPane preferredPaneId: PaneID? = nil
+    ) -> TerminalPanel? {
+        terminalPanelConfigInheritanceCandidates(
+            preferredPanelId: preferredPanelId,
+            inPane: preferredPaneId
+        ).first
+    }
+
+    private func inheritedTerminalConfig(
+        preferredPanelId: UUID? = nil,
+        inPane preferredPaneId: PaneID? = nil
+    ) -> ghostty_surface_config_s? {
+        // Walk candidates in priority order and use the first panel with a live surface.
+        // This avoids returning nil when the top candidate exists but is not attached yet.
+        for terminalPanel in terminalPanelConfigInheritanceCandidates(
+            preferredPanelId: preferredPanelId,
+            inPane: preferredPaneId
+        ) {
+            guard let sourceSurface = terminalPanel.surface.surface else { continue }
+            var config = cmuxInheritedSurfaceConfig(
+                sourceSurface: sourceSurface,
+                context: GHOSTTY_SURFACE_CONTEXT_SPLIT
+            )
+            if let rootedFontPoints = resolvedTerminalInheritanceFontPoints(
+                for: terminalPanel,
+                sourceSurface: sourceSurface,
+                inheritedConfig: config
+            ), rootedFontPoints > 0 {
+                config.font_size = rootedFontPoints
+                terminalInheritanceFontPointsByPanelId[terminalPanel.id] = rootedFontPoints
+            }
+            rememberTerminalConfigInheritanceSource(terminalPanel)
+            if config.font_size > 0 {
+                lastTerminalConfigInheritanceFontPoints = config.font_size
+            }
+            return config
+        }
+
+        if let fallbackFontPoints = lastTerminalConfigInheritanceFontPoints {
+            var config = ghostty_surface_config_new()
+            config.font_size = fallbackFontPoints
+#if DEBUG
+            dlog(
+                "zoom.inherit fallback=lastKnownFont context=split font=\(String(format: "%.2f", fallbackFontPoints))"
+            )
+#endif
+            return config
+        }
+
+        return nil
+    }
+
     /// Create a new split with a terminal panel
     @discardableResult
     func newTerminalSplit(
@@ -927,22 +1158,6 @@ final class Workspace: Identifiable, ObservableObject {
         insertFirst: Bool = false,
         focus: Bool = true
     ) -> TerminalPanel? {
-        // Get inherited config from the source terminal when possible.
-        // If the split is initiated from a non-terminal panel (for example browser),
-        // fall back to any terminal in the workspace.
-        let inheritedConfig: ghostty_surface_config_s? = {
-            if let sourceTerminal = terminalPanel(for: panelId),
-               let existing = sourceTerminal.surface.surface {
-                return ghostty_surface_inherited_config(existing, GHOSTTY_SURFACE_CONTEXT_SPLIT)
-            }
-            if let fallbackSurface = panels.values
-                .compactMap({ ($0 as? TerminalPanel)?.surface.surface })
-                .first {
-                return ghostty_surface_inherited_config(fallbackSurface, GHOSTTY_SURFACE_CONTEXT_SPLIT)
-            }
-            return nil
-        }()
-
         // Find the pane containing the source panel
         guard let sourceTabId = surfaceIdFromPanelId(panelId) else { return nil }
         var sourcePaneId: PaneID?
@@ -955,6 +1170,7 @@ final class Workspace: Identifiable, ObservableObject {
         }
 
         guard let paneId = sourcePaneId else { return nil }
+        let inheritedConfig = inheritedTerminalConfig(preferredPanelId: panelId, inPane: paneId)
 
         // Create the new terminal panel.
         let newPanel = TerminalPanel(
@@ -965,6 +1181,7 @@ final class Workspace: Identifiable, ObservableObject {
         )
         panels[newPanel.id] = newPanel
         panelTitles[newPanel.id] = newPanel.displayTitle
+        seedTerminalInheritanceFontPoints(panelId: newPanel.id, configTemplate: inheritedConfig)
 
         // Pre-generate the bonsplit tab ID so we can install the panel mapping before bonsplit
         // mutates layout state (avoids transient "Empty Panel" flashes during split).
@@ -989,6 +1206,7 @@ final class Workspace: Identifiable, ObservableObject {
             panels.removeValue(forKey: newPanel.id)
             panelTitles.removeValue(forKey: newPanel.id)
             surfaceIdToPanelId.removeValue(forKey: newTab.id)
+            terminalInheritanceFontPointsByPanelId.removeValue(forKey: newPanel.id)
             return nil
         }
 
@@ -1024,16 +1242,7 @@ final class Workspace: Identifiable, ObservableObject {
     func newTerminalSurface(inPane paneId: PaneID, focus: Bool? = nil) -> TerminalPanel? {
         let shouldFocusNewTab = focus ?? (bonsplitController.focusedPaneId == paneId)
 
-        // Get an existing terminal panel to inherit config from
-        let inheritedConfig: ghostty_surface_config_s? = {
-            for panel in panels.values {
-                if let terminalPanel = panel as? TerminalPanel,
-                   let surface = terminalPanel.surface.surface {
-                    return ghostty_surface_inherited_config(surface, GHOSTTY_SURFACE_CONTEXT_SPLIT)
-                }
-            }
-            return nil
-        }()
+        let inheritedConfig = inheritedTerminalConfig(inPane: paneId)
 
         // Create new terminal panel
         let newPanel = TerminalPanel(
@@ -1044,6 +1253,7 @@ final class Workspace: Identifiable, ObservableObject {
         )
         panels[newPanel.id] = newPanel
         panelTitles[newPanel.id] = newPanel.displayTitle
+        seedTerminalInheritanceFontPoints(panelId: newPanel.id, configTemplate: inheritedConfig)
 
         // Create tab in bonsplit
         guard let newTabId = bonsplitController.createTab(
@@ -1056,6 +1266,7 @@ final class Workspace: Identifiable, ObservableObject {
         ) else {
             panels.removeValue(forKey: newPanel.id)
             panelTitles.removeValue(forKey: newPanel.id)
+            terminalInheritanceFontPointsByPanelId.removeValue(forKey: newPanel.id)
             return nil
         }
 
@@ -1819,14 +2030,19 @@ final class Workspace: Identifiable, ObservableObject {
     /// Create a new terminal panel (used when replacing the last panel)
     @discardableResult
     func createReplacementTerminalPanel() -> TerminalPanel {
+        let inheritedConfig = inheritedTerminalConfig(
+            preferredPanelId: focusedPanelId,
+            inPane: bonsplitController.focusedPaneId
+        )
         let newPanel = TerminalPanel(
             workspaceId: id,
             context: GHOSTTY_SURFACE_CONTEXT_TAB,
-            configTemplate: nil,
+            configTemplate: inheritedConfig,
             portOrdinal: portOrdinal
         )
         panels[newPanel.id] = newPanel
         panelTitles[newPanel.id] = newPanel.displayTitle
+        seedTerminalInheritanceFontPoints(panelId: newPanel.id, configTemplate: inheritedConfig)
 
         // Create tab in bonsplit
         if let newTabId = bonsplitController.createTab(
@@ -2100,6 +2316,9 @@ extension Workspace: BonsplitDelegate {
         }
 
         panel.focus()
+        if let terminalPanel = panel as? TerminalPanel {
+            rememberTerminalConfigInheritanceSource(terminalPanel)
+        }
         let isManuallyUnread = manualUnreadPanelIds.contains(panelId)
         let markedAt = manualUnreadMarkedAt[panelId]
         if Self.shouldClearManualUnread(
@@ -2327,6 +2546,10 @@ extension Workspace: BonsplitDelegate {
         panelSubscriptions.removeValue(forKey: panelId)
         surfaceTTYNames.removeValue(forKey: panelId)
         PortScanner.shared.unregisterPanel(workspaceId: id, panelId: panelId)
+        terminalInheritanceFontPointsByPanelId.removeValue(forKey: panelId)
+        if lastTerminalConfigInheritancePanelId == panelId {
+            lastTerminalConfigInheritancePanelId = nil
+        }
 
         // Keep the workspace invariant: always retain at least one real panel.
         // This prevents runtime close callbacks from ever collapsing into a tabless workspace.
@@ -2519,15 +2742,7 @@ extension Workspace: BonsplitDelegate {
                     // Keep the existing placeholder tab identity and replace only the panel mapping.
                     // This avoids an extra create+close tab churn that can transiently render an
                     // empty pane during drag-to-split of a single-tab pane.
-                    let inheritedConfig: ghostty_surface_config_s? = {
-                        for panel in panels.values {
-                            if let terminalPanel = panel as? TerminalPanel,
-                               let surface = terminalPanel.surface.surface {
-                                return ghostty_surface_inherited_config(surface, GHOSTTY_SURFACE_CONTEXT_SPLIT)
-                            }
-                        }
-                        return nil
-                    }()
+                    let inheritedConfig = inheritedTerminalConfig(inPane: originalPane)
 
                     let replacementPanel = TerminalPanel(
                         workspaceId: id,
@@ -2537,6 +2752,7 @@ extension Workspace: BonsplitDelegate {
                     )
                     panels[replacementPanel.id] = replacementPanel
                     panelTitles[replacementPanel.id] = replacementPanel.displayTitle
+                    seedTerminalInheritanceFontPoints(panelId: replacementPanel.id, configTemplate: inheritedConfig)
                     surfaceIdToPanelId[replacementTab.id] = replacementPanel.id
 
                     bonsplitController.updateTab(
@@ -2579,7 +2795,7 @@ extension Workspace: BonsplitDelegate {
         // Get the focused terminal in the original pane to inherit config from
         guard let sourceTabId = controller.selectedTab(inPane: originalPane)?.id,
               let sourcePanelId = panelIdFromSurfaceId(sourceTabId),
-              let sourcePanel = terminalPanel(for: sourcePanelId) else { return }
+              terminalPanel(for: sourcePanelId) != nil else { return }
 
 #if DEBUG
         dlog(
@@ -2588,11 +2804,10 @@ extension Workspace: BonsplitDelegate {
         )
 #endif
 
-        let inheritedConfig: ghostty_surface_config_s? = if let existing = sourcePanel.surface.surface {
-            ghostty_surface_inherited_config(existing, GHOSTTY_SURFACE_CONTEXT_SPLIT)
-        } else {
-            nil
-        }
+        let inheritedConfig = inheritedTerminalConfig(
+            preferredPanelId: sourcePanelId,
+            inPane: originalPane
+        )
 
         let newPanel = TerminalPanel(
             workspaceId: id,
@@ -2602,6 +2817,7 @@ extension Workspace: BonsplitDelegate {
         )
         panels[newPanel.id] = newPanel
         panelTitles[newPanel.id] = newPanel.displayTitle
+        seedTerminalInheritanceFontPoints(panelId: newPanel.id, configTemplate: inheritedConfig)
 
         guard let newTabId = bonsplitController.createTab(
             title: newPanel.displayTitle,
@@ -2613,6 +2829,7 @@ extension Workspace: BonsplitDelegate {
         ) else {
             panels.removeValue(forKey: newPanel.id)
             panelTitles.removeValue(forKey: newPanel.id)
+            terminalInheritanceFontPointsByPanelId.removeValue(forKey: newPanel.id)
             return
         }
 

Sources/cmuxApp.swift

@@ -357,7 +357,7 @@ struct cmuxApp: App {
                 }
 
                 splitCommandButton(title: "New Workspace", shortcut: newWorkspaceMenuShortcut) {
-                    (AppDelegate.shared?.tabManager ?? tabManager).addTab()
+                    activeTabManager.addTab()
                 }
             }
 
@@ -392,7 +392,7 @@ struct cmuxApp: App {
                 }
 
                 Button("Reopen Closed Browser Panel") {
-                    _ = (AppDelegate.shared?.tabManager ?? tabManager).reopenMostRecentlyClosedBrowserPanel()
+                    _ = activeTabManager.reopenMostRecentlyClosedBrowserPanel()
                 }
                 .keyboardShortcut("t", modifiers: [.command, .shift])
             }
@@ -401,35 +401,35 @@ struct cmuxApp: App {
             CommandGroup(after: .textEditing) {
                 Menu("Find") {
                     Button("Find…") {
-                        (AppDelegate.shared?.tabManager ?? tabManager).startSearch()
+                        activeTabManager.startSearch()
                     }
                     .keyboardShortcut("f", modifiers: .command)
 
                     Button("Find Next") {
-                        (AppDelegate.shared?.tabManager ?? tabManager).findNext()
+                        activeTabManager.findNext()
                     }
                     .keyboardShortcut("g", modifiers: .command)
 
                     Button("Find Previous") {
-                        (AppDelegate.shared?.tabManager ?? tabManager).findPrevious()
+                        activeTabManager.findPrevious()
                     }
                     .keyboardShortcut("g", modifiers: [.command, .shift])
 
                     Divider()
 
                     Button("Hide Find Bar") {
-                        (AppDelegate.shared?.tabManager ?? tabManager).hideFind()
+                        activeTabManager.hideFind()
                     }
                     .keyboardShortcut("f", modifiers: [.command, .shift])
-                    .disabled(!((AppDelegate.shared?.tabManager ?? tabManager).isFindVisible))
+                    .disabled(!(activeTabManager.isFindVisible))
 
                     Divider()
 
                     Button("Use Selection for Find") {
-                        (AppDelegate.shared?.tabManager ?? tabManager).searchSelection()
+                        activeTabManager.searchSelection()
                     }
                     .keyboardShortcut("e", modifiers: .command)
-                    .disabled(!((AppDelegate.shared?.tabManager ?? tabManager).canUseSelectionForFind))
+                    .disabled(!(activeTabManager.canUseSelectionForFind))
                 }
             }
 
@@ -444,54 +444,54 @@ struct cmuxApp: App {
                 Divider()
 
                 splitCommandButton(title: "Next Surface", shortcut: nextSurfaceMenuShortcut) {
-                    (AppDelegate.shared?.tabManager ?? tabManager).selectNextSurface()
+                    activeTabManager.selectNextSurface()
                 }
 
                 splitCommandButton(title: "Previous Surface", shortcut: prevSurfaceMenuShortcut) {
-                    (AppDelegate.shared?.tabManager ?? tabManager).selectPreviousSurface()
+                    activeTabManager.selectPreviousSurface()
                 }
 
                 Button("Back") {
-                    (AppDelegate.shared?.tabManager ?? tabManager).focusedBrowserPanel?.goBack()
+                    activeTabManager.focusedBrowserPanel?.goBack()
                 }
                 .keyboardShortcut("[", modifiers: .command)
 
                 Button("Forward") {
-                    (AppDelegate.shared?.tabManager ?? tabManager).focusedBrowserPanel?.goForward()
+                    activeTabManager.focusedBrowserPanel?.goForward()
                 }
                 .keyboardShortcut("]", modifiers: .command)
 
                 Button("Reload Page") {
-                    (AppDelegate.shared?.tabManager ?? tabManager).focusedBrowserPanel?.reload()
+                    activeTabManager.focusedBrowserPanel?.reload()
                 }
                 .keyboardShortcut("r", modifiers: .command)
 
                 splitCommandButton(title: "Toggle Developer Tools", shortcut: toggleBrowserDeveloperToolsMenuShortcut) {
-                    let manager = (AppDelegate.shared?.tabManager ?? tabManager)
+                    let manager = activeTabManager
                     if !manager.toggleDeveloperToolsFocusedBrowser() {
                         NSSound.beep()
                     }
                 }
 
                 splitCommandButton(title: "Show JavaScript Console", shortcut: showBrowserJavaScriptConsoleMenuShortcut) {
-                    let manager = (AppDelegate.shared?.tabManager ?? tabManager)
+                    let manager = activeTabManager
                     if !manager.showJavaScriptConsoleFocusedBrowser() {
                         NSSound.beep()
                     }
                 }
 
                 Button("Zoom In") {
-                    _ = (AppDelegate.shared?.tabManager ?? tabManager).zoomInFocusedBrowser()
+                    _ = activeTabManager.zoomInFocusedBrowser()
                 }
                 .keyboardShortcut("=", modifiers: .command)
 
                 Button("Zoom Out") {
-                    _ = (AppDelegate.shared?.tabManager ?? tabManager).zoomOutFocusedBrowser()
+                    _ = activeTabManager.zoomOutFocusedBrowser()
                 }
                 .keyboardShortcut("-", modifiers: .command)
 
                 Button("Actual Size") {
-                    _ = (AppDelegate.shared?.tabManager ?? tabManager).resetZoomFocusedBrowser()
+                    _ = activeTabManager.resetZoomFocusedBrowser()
                 }
                 .keyboardShortcut("0", modifiers: .command)
 
@@ -500,11 +500,11 @@ struct cmuxApp: App {
                 }
 
                 splitCommandButton(title: "Next Workspace", shortcut: nextWorkspaceMenuShortcut) {
-                    (AppDelegate.shared?.tabManager ?? tabManager).selectNextTab()
+                    activeTabManager.selectNextTab()
                 }
 
                 splitCommandButton(title: "Previous Workspace", shortcut: prevWorkspaceMenuShortcut) {
-                    (AppDelegate.shared?.tabManager ?? tabManager).selectPreviousTab()
+                    activeTabManager.selectPreviousTab()
                 }
 
                 splitCommandButton(title: "Rename Workspace…", shortcut: renameWorkspaceMenuShortcut) {
@@ -534,7 +534,7 @@ struct cmuxApp: App {
                 // Cmd+1 through Cmd+9 for workspace selection (9 = last workspace)
                 ForEach(1...9, id: \.self) { number in
                     Button("Workspace \(number)") {
-                        let manager = (AppDelegate.shared?.tabManager ?? tabManager)
+                        let manager = activeTabManager
                         if let targetIndex = WorkspaceShortcutMapper.workspaceIndex(forCommandDigit: number, workspaceCount: manager.tabs.count) {
                             manager.selectTab(at: targetIndex)
                         }
@@ -705,6 +705,12 @@ struct cmuxApp: App {
         NotificationMenuSnapshotBuilder.make(notifications: notificationStore.notifications)
     }
 
+    private var activeTabManager: TabManager {
+        AppDelegate.shared?.synchronizeActiveMainWindowContext(
+            preferredWindow: NSApp.keyWindow ?? NSApp.mainWindow
+        ) ?? tabManager
+    }
+
     private func decodeShortcut(from data: Data, fallback: StoredShortcut) -> StoredShortcut {
         guard !data.isEmpty,
               let shortcut = try? JSONDecoder().decode(StoredShortcut.self, from: data) else {
@@ -756,11 +762,11 @@ struct cmuxApp: App {
             window.performClose(nil)
             return
         }
-        (AppDelegate.shared?.tabManager ?? tabManager).closeCurrentPanelWithConfirmation()
+        activeTabManager.closeCurrentPanelWithConfirmation()
     }
 
     private func closeTabOrWindow() {
-        (AppDelegate.shared?.tabManager ?? tabManager).closeCurrentTabWithConfirmation()
+        activeTabManager.closeCurrentTabWithConfirmation()
     }
 
     private func showNotificationsPopover() {

cmuxTests/CmuxWebViewKeyEquivalentTests.swift

@@ -376,6 +376,127 @@ final class CmuxWebViewKeyEquivalentTests: XCTestCase {
     }
 }
 
+@MainActor
+final class AppDelegateWindowContextRoutingTests: XCTestCase {
+    private func makeMainWindow(id: UUID) -> NSWindow {
+        let window = NSWindow(
+            contentRect: NSRect(x: 0, y: 0, width: 500, height: 320),
+            styleMask: [.titled, .closable],
+            backing: .buffered,
+            defer: false
+        )
+        window.identifier = NSUserInterfaceItemIdentifier("cmux.main.\(id.uuidString)")
+        return window
+    }
+
+    func testSynchronizeActiveMainWindowContextPrefersProvidedWindowOverStaleActiveManager() {
+        _ = NSApplication.shared
+        let app = AppDelegate()
+
+        let windowAId = UUID()
+        let windowBId = UUID()
+        let windowA = makeMainWindow(id: windowAId)
+        let windowB = makeMainWindow(id: windowBId)
+        defer {
+            windowA.orderOut(nil)
+            windowB.orderOut(nil)
+        }
+
+        let managerA = TabManager()
+        let managerB = TabManager()
+        app.registerMainWindow(
+            windowA,
+            windowId: windowAId,
+            tabManager: managerA,
+            sidebarState: SidebarState(),
+            sidebarSelectionState: SidebarSelectionState()
+        )
+        app.registerMainWindow(
+            windowB,
+            windowId: windowBId,
+            tabManager: managerB,
+            sidebarState: SidebarState(),
+            sidebarSelectionState: SidebarSelectionState()
+        )
+
+        windowB.makeKeyAndOrderFront(nil)
+        _ = app.synchronizeActiveMainWindowContext(preferredWindow: windowB)
+        XCTAssertTrue(app.tabManager === managerB)
+
+        windowA.makeKeyAndOrderFront(nil)
+        let resolved = app.synchronizeActiveMainWindowContext(preferredWindow: windowA)
+        XCTAssertTrue(resolved === managerA, "Expected provided active window to win over stale active manager")
+        XCTAssertTrue(app.tabManager === managerA)
+    }
+
+    func testSynchronizeActiveMainWindowContextFallsBackToActiveManagerWithoutFocusedWindow() {
+        _ = NSApplication.shared
+        let app = AppDelegate()
+
+        let windowAId = UUID()
+        let windowBId = UUID()
+        let windowA = makeMainWindow(id: windowAId)
+        let windowB = makeMainWindow(id: windowBId)
+        defer {
+            windowA.orderOut(nil)
+            windowB.orderOut(nil)
+        }
+
+        let managerA = TabManager()
+        let managerB = TabManager()
+        app.registerMainWindow(
+            windowA,
+            windowId: windowAId,
+            tabManager: managerA,
+            sidebarState: SidebarState(),
+            sidebarSelectionState: SidebarSelectionState()
+        )
+        app.registerMainWindow(
+            windowB,
+            windowId: windowBId,
+            tabManager: managerB,
+            sidebarState: SidebarState(),
+            sidebarSelectionState: SidebarSelectionState()
+        )
+
+        // Seed active manager and clear focus windows to force fallback routing.
+        windowA.makeKeyAndOrderFront(nil)
+        _ = app.synchronizeActiveMainWindowContext(preferredWindow: windowA)
+        XCTAssertTrue(app.tabManager === managerA)
+        windowA.orderOut(nil)
+        windowB.orderOut(nil)
+
+        let resolved = app.synchronizeActiveMainWindowContext(preferredWindow: nil)
+        XCTAssertTrue(resolved === managerA, "Expected fallback to preserve current active manager instead of arbitrary window")
+        XCTAssertTrue(app.tabManager === managerA)
+    }
+
+    func testSynchronizeActiveMainWindowContextUsesRegisteredWindowEvenIfIdentifierMutates() {
+        _ = NSApplication.shared
+        let app = AppDelegate()
+
+        let windowId = UUID()
+        let window = makeMainWindow(id: windowId)
+        defer { window.orderOut(nil) }
+
+        let manager = TabManager()
+        app.registerMainWindow(
+            window,
+            windowId: windowId,
+            tabManager: manager,
+            sidebarState: SidebarState(),
+            sidebarSelectionState: SidebarSelectionState()
+        )
+
+        // SwiftUI can replace the NSWindow identifier string at runtime.
+        window.identifier = NSUserInterfaceItemIdentifier("SwiftUI.AppWindow.IdentifierChanged")
+
+        let resolved = app.synchronizeActiveMainWindowContext(preferredWindow: window)
+        XCTAssertTrue(resolved === manager, "Expected registered window object identity to win even if identifier string changed")
+        XCTAssertTrue(app.tabManager === manager)
+    }
+}
+
 final class FocusFlashPatternTests: XCTestCase {
     func testFocusFlashPatternMatchesTerminalDoublePulseShape() {
         XCTAssertEqual(FocusFlashPattern.values, [0, 1, 0, 1, 0])
@@ -1048,6 +1169,25 @@ final class BrowserOmnibarCommandNavigationTests: XCTestCase {
         )
     }
 
+    func testArrowNavigationDeltaIgnoresCapsLockModifier() {
+        XCTAssertEqual(
+            browserOmnibarSelectionDeltaForArrowNavigation(
+                hasFocusedAddressBar: true,
+                flags: [.capsLock],
+                keyCode: 126
+            ),
+            -1
+        )
+        XCTAssertEqual(
+            browserOmnibarSelectionDeltaForArrowNavigation(
+                hasFocusedAddressBar: true,
+                flags: [.capsLock],
+                keyCode: 125
+            ),
+            1
+        )
+    }
+
     func testCommandNavigationDeltaRequiresFocusedAddressBarAndCommandOrControlOnly() {
         XCTAssertNil(
             browserOmnibarSelectionDeltaForCommandNavigation(
@@ -1101,6 +1241,33 @@ final class BrowserOmnibarCommandNavigationTests: XCTestCase {
             1
         )
     }
+
+    func testCommandNavigationDeltaIgnoresCapsLockModifier() {
+        XCTAssertEqual(
+            browserOmnibarSelectionDeltaForCommandNavigation(
+                hasFocusedAddressBar: true,
+                flags: [.control, .capsLock],
+                chars: "n"
+            ),
+            1
+        )
+        XCTAssertEqual(
+            browserOmnibarSelectionDeltaForCommandNavigation(
+                hasFocusedAddressBar: true,
+                flags: [.command, .capsLock],
+                chars: "p"
+            ),
+            -1
+        )
+    }
+
+    func testSubmitOnReturnIgnoresCapsLockModifier() {
+        XCTAssertTrue(browserOmnibarShouldSubmitOnReturn(flags: []))
+        XCTAssertTrue(browserOmnibarShouldSubmitOnReturn(flags: [.shift]))
+        XCTAssertTrue(browserOmnibarShouldSubmitOnReturn(flags: [.capsLock]))
+        XCTAssertTrue(browserOmnibarShouldSubmitOnReturn(flags: [.shift, .capsLock]))
+        XCTAssertFalse(browserOmnibarShouldSubmitOnReturn(flags: [.command, .capsLock]))
+    }
 }
 
 final class BrowserZoomShortcutActionTests: XCTestCase {
@@ -1117,6 +1284,10 @@ final class BrowserZoomShortcutActionTests: XCTestCase {
             browserZoomShortcutAction(flags: [.command, .shift], chars: "+", keyCode: 24),
             .zoomIn
         )
+        XCTAssertEqual(
+            browserZoomShortcutAction(flags: [.command], chars: "+", keyCode: 30),
+            .zoomIn
+        )
     }
 
     func testZoomOutSupportsMinusAndUnderscoreVariants() {
@@ -1195,6 +1366,30 @@ final class BrowserZoomShortcutRoutingPolicyTests: XCTestCase {
     }
 }
 
+final class GhosttyResponderResolutionTests: XCTestCase {
+    private final class FocusProbeView: NSView {
+        override var acceptsFirstResponder: Bool { true }
+    }
+
+    func testResolvesGhosttyViewFromDescendantResponder() {
+        let ghosttyView = GhosttyNSView(frame: NSRect(x: 0, y: 0, width: 200, height: 120))
+        let descendant = FocusProbeView(frame: NSRect(x: 0, y: 0, width: 40, height: 40))
+        ghosttyView.addSubview(descendant)
+
+        XCTAssertTrue(cmuxOwningGhosttyView(for: descendant) === ghosttyView)
+    }
+
+    func testResolvesGhosttyViewFromGhosttyResponder() {
+        let ghosttyView = GhosttyNSView(frame: NSRect(x: 0, y: 0, width: 200, height: 120))
+        XCTAssertTrue(cmuxOwningGhosttyView(for: ghosttyView) === ghosttyView)
+    }
+
+    func testReturnsNilForUnrelatedResponder() {
+        let view = FocusProbeView(frame: NSRect(x: 0, y: 0, width: 40, height: 40))
+        XCTAssertNil(cmuxOwningGhosttyView(for: view))
+    }
+}
+
 final class CommandPaletteKeyboardNavigationTests: XCTestCase {
     func testArrowKeysMoveSelectionWithoutModifiers() {
         XCTAssertEqual(
@@ -1342,115 +1537,34 @@ final class CommandPaletteRenameSelectionSettingsTests: XCTestCase {
 }
 
 final class CommandPaletteSelectionScrollBehaviorTests: XCTestCase {
-    func testFirstEntryAlwaysPinsToTopWhenScrollable() {
-        let anchor = ContentView.commandPaletteScrollAnchor(
+    func testFirstEntryPinsToTopAnchor() {
+        let anchor = ContentView.commandPaletteScrollPositionAnchor(
             selectedIndex: 0,
-            previousIndex: 1,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 8, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
+            resultCount: 20
         )
-        XCTAssertEqual(anchor, .top)
+        XCTAssertEqual(anchor, UnitPoint.top)
     }
 
-    func testLastEntryAlwaysPinsToBottomWhenScrollable() {
-        let anchor = ContentView.commandPaletteScrollAnchor(
+    func testLastEntryPinsToBottomAnchor() {
+        let anchor = ContentView.commandPaletteScrollPositionAnchor(
             selectedIndex: 19,
-            previousIndex: 18,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 188, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
+            resultCount: 20
         )
-        XCTAssertEqual(anchor, .bottom)
+        XCTAssertEqual(anchor, UnitPoint.bottom)
     }
 
-    func testFullyVisibleMiddleEntryDoesNotScroll() {
-        let anchor = ContentView.commandPaletteScrollAnchor(
+    func testMiddleEntryUsesNilAnchorForMinimalScroll() {
+        let anchor = ContentView.commandPaletteScrollPositionAnchor(
             selectedIndex: 6,
-            previousIndex: 5,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 120, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
+            resultCount: 20
         )
         XCTAssertNil(anchor)
     }
 
-    func testOutOfViewMiddleEntryUsesDirectionForAnchor() {
-        let downAnchor = ContentView.commandPaletteScrollAnchor(
-            selectedIndex: 9,
-            previousIndex: 8,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 210, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
-        )
-        XCTAssertEqual(downAnchor, .bottom)
-
-        let upAnchor = ContentView.commandPaletteScrollAnchor(
-            selectedIndex: 8,
-            previousIndex: 9,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: -6, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
-        )
-        XCTAssertEqual(upAnchor, .top)
-    }
-}
-
-final class CommandPaletteEdgeVisibilityCorrectionTests: XCTestCase {
-    func testTopEdgeReturnsTopWhenNotPinned() {
-        let anchor = ContentView.commandPaletteEdgeVisibilityCorrectionAnchor(
+    func testEmptyResultsProduceNoAnchor() {
+        let anchor = ContentView.commandPaletteScrollPositionAnchor(
             selectedIndex: 0,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 6, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
-        )
-        XCTAssertEqual(anchor, .top)
-    }
-
-    func testBottomEdgeReturnsBottomWhenNotPinned() {
-        let anchor = ContentView.commandPaletteEdgeVisibilityCorrectionAnchor(
-            selectedIndex: 19,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 170, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
-        )
-        XCTAssertEqual(anchor, .bottom)
-    }
-
-    func testPinnedTopAndBottomReturnNil() {
-        let topAnchor = ContentView.commandPaletteEdgeVisibilityCorrectionAnchor(
-            selectedIndex: 0,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 0, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
-        )
-        XCTAssertNil(topAnchor)
-
-        let bottomAnchor = ContentView.commandPaletteEdgeVisibilityCorrectionAnchor(
-            selectedIndex: 19,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 192, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
-        )
-        XCTAssertNil(bottomAnchor)
-    }
-
-    func testMiddleSelectionNeverForcesCorrection() {
-        let anchor = ContentView.commandPaletteEdgeVisibilityCorrectionAnchor(
-            selectedIndex: 8,
-            resultCount: 20,
-            selectedFrame: CGRect(x: 0, y: 96, width: 200, height: 24),
-            viewportHeight: 216,
-            contentHeight: 480
+            resultCount: 0
         )
         XCTAssertNil(anchor)
     }
@@ -2192,6 +2306,141 @@ final class TabManagerSurfaceCreationTests: XCTestCase {
     }
 }
 
+@MainActor
+final class WorkspaceTerminalConfigInheritanceSelectionTests: XCTestCase {
+    func testPrefersSelectedTerminalInTargetPaneOverFocusedTerminalElsewhere() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let leftPanelId = workspace.focusedPanelId,
+              let rightPanel = workspace.newTerminalSplit(from: leftPanelId, orientation: .horizontal),
+              let leftPaneId = workspace.paneId(forPanelId: leftPanelId) else {
+            XCTFail("Expected workspace split setup to succeed")
+            return
+        }
+
+        // Programmatic split focuses the new right panel by default.
+        XCTAssertEqual(workspace.focusedPanelId, rightPanel.id)
+
+        let sourcePanel = workspace.terminalPanelForConfigInheritance(inPane: leftPaneId)
+        XCTAssertEqual(
+            sourcePanel?.id,
+            leftPanelId,
+            "Expected inheritance to use the selected terminal in the target pane"
+        )
+    }
+
+    func testFallsBackToAnotherTerminalInPaneWhenSelectedTabIsBrowser() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let terminalPanelId = workspace.focusedPanelId,
+              let paneId = workspace.paneId(forPanelId: terminalPanelId),
+              let browserPanel = workspace.newBrowserSurface(inPane: paneId, focus: true) else {
+            XCTFail("Expected workspace browser setup to succeed")
+            return
+        }
+
+        XCTAssertEqual(workspace.focusedPanelId, browserPanel.id)
+
+        let sourcePanel = workspace.terminalPanelForConfigInheritance(inPane: paneId)
+        XCTAssertEqual(
+            sourcePanel?.id,
+            terminalPanelId,
+            "Expected inheritance to fall back to a terminal in the pane when browser is selected"
+        )
+    }
+
+    func testPreferredTerminalPanelWinsWhenProvided() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let terminalPanelId = workspace.focusedPanelId else {
+            XCTFail("Expected selected workspace with a terminal panel")
+            return
+        }
+
+        let sourcePanel = workspace.terminalPanelForConfigInheritance(preferredPanelId: terminalPanelId)
+        XCTAssertEqual(sourcePanel?.id, terminalPanelId)
+    }
+
+    func testPrefersLastFocusedTerminalWhenBrowserFocusedInDifferentPane() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let leftTerminalPanelId = workspace.focusedPanelId,
+              let rightTerminalPanel = workspace.newTerminalSplit(from: leftTerminalPanelId, orientation: .horizontal),
+              let rightPaneId = workspace.paneId(forPanelId: rightTerminalPanel.id) else {
+            XCTFail("Expected split setup to succeed")
+            return
+        }
+
+        workspace.focusPanel(leftTerminalPanelId)
+        _ = workspace.newBrowserSurface(inPane: rightPaneId, focus: true)
+        XCTAssertNotEqual(workspace.focusedPanelId, leftTerminalPanelId)
+
+        let sourcePanel = workspace.terminalPanelForConfigInheritance(inPane: rightPaneId)
+        XCTAssertEqual(
+            sourcePanel?.id,
+            leftTerminalPanelId,
+            "Expected inheritance to prefer last focused terminal when browser is focused in another pane"
+        )
+    }
+}
+
+@MainActor
+final class TabManagerWorkspaceConfigInheritanceSourceTests: XCTestCase {
+    func testUsesFocusedTerminalWhenTerminalIsFocused() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let terminalPanelId = workspace.focusedPanelId else {
+            XCTFail("Expected selected workspace with focused terminal")
+            return
+        }
+
+        let sourcePanel = manager.terminalPanelForWorkspaceConfigInheritanceSource()
+        XCTAssertEqual(sourcePanel?.id, terminalPanelId)
+    }
+
+    func testFallsBackToTerminalWhenBrowserIsFocused() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let terminalPanelId = workspace.focusedPanelId,
+              let paneId = workspace.paneId(forPanelId: terminalPanelId),
+              let browserPanel = workspace.newBrowserSurface(inPane: paneId, focus: true) else {
+            XCTFail("Expected selected workspace setup to succeed")
+            return
+        }
+
+        XCTAssertEqual(workspace.focusedPanelId, browserPanel.id)
+
+        let sourcePanel = manager.terminalPanelForWorkspaceConfigInheritanceSource()
+        XCTAssertEqual(
+            sourcePanel?.id,
+            terminalPanelId,
+            "Expected new workspace inheritance source to resolve to the pane terminal when browser is focused"
+        )
+    }
+
+    func testPrefersLastFocusedTerminalAcrossPanesWhenBrowserIsFocused() {
+        let manager = TabManager()
+        guard let workspace = manager.selectedWorkspace,
+              let leftTerminalPanelId = workspace.focusedPanelId,
+              let rightTerminalPanel = workspace.newTerminalSplit(from: leftTerminalPanelId, orientation: .horizontal),
+              let rightPaneId = workspace.paneId(forPanelId: rightTerminalPanel.id) else {
+            XCTFail("Expected split setup to succeed")
+            return
+        }
+
+        workspace.focusPanel(leftTerminalPanelId)
+        _ = workspace.newBrowserSurface(inPane: rightPaneId, focus: true)
+        XCTAssertNotEqual(workspace.focusedPanelId, leftTerminalPanelId)
+
+        let sourcePanel = manager.terminalPanelForWorkspaceConfigInheritanceSource()
+        XCTAssertEqual(
+            sourcePanel?.id,
+            leftTerminalPanelId,
+            "Expected workspace inheritance source to use last focused terminal across panes"
+        )
+    }
+}
+
 @MainActor
 final class TabManagerReopenClosedBrowserFocusTests: XCTestCase {
     func testReopenFromDifferentWorkspaceFocusesReopenedBrowser() {
@@ -3008,6 +3257,63 @@ final class FinderServicePathResolverTests: XCTestCase {
     }
 }
 
+final class TerminalDirectoryOpenTargetAvailabilityTests: XCTestCase {
+    private func environment(
+        existingPaths: Set<String>,
+        homeDirectoryPath: String = "/Users/tester"
+    ) -> TerminalDirectoryOpenTarget.DetectionEnvironment {
+        TerminalDirectoryOpenTarget.DetectionEnvironment(
+            homeDirectoryPath: homeDirectoryPath,
+            fileExistsAtPath: { existingPaths.contains($0) }
+        )
+    }
+
+    func testAvailableTargetsDetectSystemApplications() {
+        let env = environment(
+            existingPaths: [
+                "/Applications/Visual Studio Code.app",
+                "/System/Library/CoreServices/Finder.app",
+                "/System/Applications/Utilities/Terminal.app",
+                "/Applications/Zed Preview.app",
+            ]
+        )
+
+        let availableTargets = TerminalDirectoryOpenTarget.availableTargets(in: env)
+        XCTAssertTrue(availableTargets.contains(.vscode))
+        XCTAssertTrue(availableTargets.contains(.finder))
+        XCTAssertTrue(availableTargets.contains(.terminal))
+        XCTAssertTrue(availableTargets.contains(.zed))
+        XCTAssertFalse(availableTargets.contains(.cursor))
+    }
+
+    func testAvailableTargetsFallbackToUserApplications() {
+        let env = environment(
+            existingPaths: [
+                "/Users/tester/Applications/Cursor.app",
+                "/Users/tester/Applications/Warp.app",
+                "/Users/tester/Applications/Android Studio.app",
+            ]
+        )
+
+        let availableTargets = TerminalDirectoryOpenTarget.availableTargets(in: env)
+        XCTAssertTrue(availableTargets.contains(.cursor))
+        XCTAssertTrue(availableTargets.contains(.warp))
+        XCTAssertTrue(availableTargets.contains(.androidStudio))
+        XCTAssertFalse(availableTargets.contains(.vscode))
+    }
+
+    func testITerm2DetectsLegacyBundleName() {
+        let env = environment(existingPaths: ["/Applications/iTerm.app"])
+        XCTAssertTrue(TerminalDirectoryOpenTarget.iterm2.isAvailable(in: env))
+    }
+
+    func testCommandPaletteShortcutsExcludeGenericIDEEntry() {
+        let targets = TerminalDirectoryOpenTarget.commandPaletteShortcutTargets
+        XCTAssertFalse(targets.contains(where: { $0.commandPaletteTitle == "Open Current Directory in IDE" }))
+        XCTAssertFalse(targets.contains(where: { $0.commandPaletteCommandId == "palette.terminalOpenDirectory" }))
+    }
+}
+
 final class BrowserSearchEngineTests: XCTestCase {
     func testGoogleSearchURL() throws {
         let url = try XCTUnwrap(BrowserSearchEngine.google.searchURL(query: "hello world"))
@@ -4287,6 +4593,50 @@ final class GhosttySurfaceOverlayTests: XCTestCase {
         XCTAssertTrue(state.isHidden)
     }
 
+    func testWindowResignKeyClearsFocusedTerminalFirstResponder() {
+        let window = NSWindow(
+            contentRect: NSRect(x: 0, y: 0, width: 360, height: 240),
+            styleMask: [.titled, .closable],
+            backing: .buffered,
+            defer: false
+        )
+        defer { window.orderOut(nil) }
+
+        guard let contentView = window.contentView else {
+            XCTFail("Expected content view")
+            return
+        }
+
+        let hostedView = GhosttySurfaceScrollView(
+            surfaceView: GhosttyNSView(frame: NSRect(x: 0, y: 0, width: 160, height: 120))
+        )
+        hostedView.frame = contentView.bounds
+        hostedView.autoresizingMask = [.width, .height]
+        contentView.addSubview(hostedView)
+
+        window.makeKeyAndOrderFront(nil)
+        window.displayIfNeeded()
+        contentView.layoutSubtreeIfNeeded()
+        RunLoop.current.run(until: Date().addingTimeInterval(0.05))
+
+        hostedView.setVisibleInUI(true)
+        hostedView.setActive(true)
+        hostedView.moveFocus()
+        RunLoop.current.run(until: Date().addingTimeInterval(0.05))
+        XCTAssertTrue(
+            hostedView.isSurfaceViewFirstResponder(),
+            "Expected terminal surface to be first responder before window blur"
+        )
+
+        NotificationCenter.default.post(name: NSWindow.didResignKeyNotification, object: window)
+        RunLoop.current.run(until: Date().addingTimeInterval(0.05))
+
+        XCTAssertFalse(
+            hostedView.isSurfaceViewFirstResponder(),
+            "Window blur should force terminal surface to resign first responder"
+        )
+    }
+
     func testSearchOverlayMountsAndUnmountsWithSearchState() {
         let surface = TerminalSurface(
             tabId: UUID(),
@@ -4998,6 +5348,38 @@ final class TerminalOpenURLTargetResolutionTests: XCTestCase {
     }
 }
 
+final class BrowserExternalNavigationSchemeTests: XCTestCase {
+    func testCustomAppSchemesOpenExternally() throws {
+        let discord = try XCTUnwrap(URL(string: "discord://login/one-time?token=abc"))
+        let slack = try XCTUnwrap(URL(string: "slack://open"))
+        let zoom = try XCTUnwrap(URL(string: "zoommtg://zoom.us/join"))
+        let mailto = try XCTUnwrap(URL(string: "mailto:test@example.com"))
+
+        XCTAssertTrue(browserShouldOpenURLExternally(discord))
+        XCTAssertTrue(browserShouldOpenURLExternally(slack))
+        XCTAssertTrue(browserShouldOpenURLExternally(zoom))
+        XCTAssertTrue(browserShouldOpenURLExternally(mailto))
+    }
+
+    func testEmbeddedBrowserSchemesStayInWebView() throws {
+        let https = try XCTUnwrap(URL(string: "https://example.com"))
+        let http = try XCTUnwrap(URL(string: "http://example.com"))
+        let about = try XCTUnwrap(URL(string: "about:blank"))
+        let data = try XCTUnwrap(URL(string: "data:text/plain,hello"))
+        let blob = try XCTUnwrap(URL(string: "blob:https://example.com/550e8400-e29b-41d4-a716-446655440000"))
+        let javascript = try XCTUnwrap(URL(string: "javascript:void(0)"))
+        let webkitInternal = try XCTUnwrap(URL(string: "applewebdata://local/page"))
+
+        XCTAssertFalse(browserShouldOpenURLExternally(https))
+        XCTAssertFalse(browserShouldOpenURLExternally(http))
+        XCTAssertFalse(browserShouldOpenURLExternally(about))
+        XCTAssertFalse(browserShouldOpenURLExternally(data))
+        XCTAssertFalse(browserShouldOpenURLExternally(blob))
+        XCTAssertFalse(browserShouldOpenURLExternally(javascript))
+        XCTAssertFalse(browserShouldOpenURLExternally(webkitInternal))
+    }
+}
+
 final class BrowserHostWhitelistTests: XCTestCase {
     private var suiteName: String!
     private var defaults: UserDefaults!

cmuxUITests/SidebarResizeUITests.swift

@@ -35,4 +35,31 @@ final class SidebarResizeUITests: XCTestCase {
         XCTAssertLessThanOrEqual(leftDelta, -40, "Expected drag-left to move resizer left")
         XCTAssertGreaterThanOrEqual(leftDelta, -122, "Resizer moved farther than requested drag-left offset")
     }
+
+    func testSidebarResizerHasMaximumWidthCap() {
+        let app = XCUIApplication()
+        app.launch()
+
+        let window = app.windows.firstMatch
+        XCTAssertTrue(window.waitForExistence(timeout: 5.0))
+
+        let elements = app.descendants(matching: .any)
+        let resizer = elements["SidebarResizer"]
+        XCTAssertTrue(resizer.waitForExistence(timeout: 5.0))
+
+        let start = resizer.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.5))
+        let farRight = start.withOffset(CGVector(dx: 5000, dy: 0))
+        start.press(forDuration: 0.1, thenDragTo: farRight)
+
+        let windowFrame = window.frame
+        let remainingWidth = max(0, windowFrame.maxX - resizer.frame.maxX)
+        let minimumExpectedRemaining = windowFrame.width * 0.45
+
+        XCTAssertGreaterThanOrEqual(
+            remainingWidth,
+            minimumExpectedRemaining,
+            "Expected sidebar max-width clamp to leave substantial terminal width. " +
+            "remaining=\(remainingWidth), window=\(windowFrame.width)"
+        )
+    }
 }

tests/test_ci_self_hosted_guard.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# Regression test for https://github.com/manaflow-ai/cmux/issues/385.
+# Ensures self-hosted UI tests are never run for fork pull requests.
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+WORKFLOW_FILE="$ROOT_DIR/.github/workflows/ci.yml"
+
+EXPECTED_IF="if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository"
+
+if ! grep -Fq "$EXPECTED_IF" "$WORKFLOW_FILE"; then
+  echo "FAIL: Missing fork pull_request guard for ui-tests in $WORKFLOW_FILE"
+  echo "Expected line:"
+  echo "  $EXPECTED_IF"
+  exit 1
+fi
+
+if ! awk '
+  /^  ui-tests:/ { in_ui_tests=1; next }
+  in_ui_tests && /^  [^[:space:]]/ { in_ui_tests=0 }
+  in_ui_tests && /runs-on: self-hosted/ { saw_self_hosted=1 }
+  in_ui_tests && /github.event.pull_request.head.repo.full_name == github.repository/ { saw_guard=1 }
+  END { exit !(saw_self_hosted && saw_guard) }
+' "$WORKFLOW_FILE"; then
+  echo "FAIL: ui-tests block must keep both self-hosted and fork guard"
+  exit 1
+fi
+
+echo "PASS: ui-tests self-hosted fork guard is present"

tests/test_terminal_resize_portal_regressions.py

@@ -0,0 +1,106 @@
+#!/usr/bin/env python3
+"""Static regression checks for terminal tiny-pane resize/overflow fixes.
+
+Guards the key invariants for issue #348:
+1) Terminal portal sync must stabilize layout and clamp hosted frames to host bounds.
+2) Surface sizing must prefer live bounds over stale pending values when available.
+"""
+
+from __future__ import annotations
+
+import subprocess
+from pathlib import Path
+
+
+def repo_root() -> Path:
+    result = subprocess.run(
+        ["git", "rev-parse", "--show-toplevel"],
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode == 0:
+        return Path(result.stdout.strip())
+    return Path(__file__).resolve().parents[1]
+
+
+def extract_block(source: str, signature: str) -> str:
+    start = source.find(signature)
+    if start < 0:
+        raise ValueError(f"Missing signature: {signature}")
+    brace_start = source.find("{", start)
+    if brace_start < 0:
+        raise ValueError(f"Missing opening brace for: {signature}")
+
+    depth = 0
+    for idx in range(brace_start, len(source)):
+        char = source[idx]
+        if char == "{":
+            depth += 1
+        elif char == "}":
+            depth -= 1
+            if depth == 0:
+                return source[brace_start : idx + 1]
+    raise ValueError(f"Unbalanced braces for: {signature}")
+
+
+def main() -> int:
+    root = repo_root()
+    failures: list[str] = []
+
+    portal_path = root / "Sources" / "TerminalWindowPortal.swift"
+    portal_source = portal_path.read_text(encoding="utf-8")
+
+    if "hostView.layer?.masksToBounds = true" not in portal_source:
+        failures.append("WindowTerminalPortal init no longer enables hostView layer clipping")
+    if "hostView.postsFrameChangedNotifications = true" not in portal_source:
+        failures.append("WindowTerminalPortal init no longer enables hostView frame-change notifications")
+    if "hostView.postsBoundsChangedNotifications = true" not in portal_source:
+        failures.append("WindowTerminalPortal init no longer enables hostView bounds-change notifications")
+
+    if "private func synchronizeLayoutHierarchy()" not in portal_source:
+        failures.append("WindowTerminalPortal missing synchronizeLayoutHierarchy()")
+    if "private func synchronizeHostFrameToReference() -> Bool" not in portal_source:
+        failures.append("WindowTerminalPortal missing synchronizeHostFrameToReference()")
+    if "hostedView.reconcileGeometryNow()" not in extract_block(
+        portal_source,
+        "func bind(hostedView: GhosttySurfaceScrollView, to anchorView: NSView, visibleInUI: Bool, zPriority: Int = 0)",
+    ):
+        failures.append("bind() no longer pre-reconciles hosted geometry before attach")
+
+    sync_block = extract_block(portal_source, "private func synchronizeHostedView(withId hostedId: ObjectIdentifier)")
+    for required in [
+        "let hostBounds = hostView.bounds",
+        "let clampedFrame = frameInHost.intersection(hostBounds)",
+        "let targetFrame = (hasFiniteFrame && hasVisibleIntersection) ? clampedFrame : frameInHost",
+        "scheduleDeferredFullSynchronizeAll()",
+        "hostedView.reconcileGeometryNow()",
+        "hostedView.refreshSurfaceNow()",
+    ]:
+        if required not in sync_block:
+            failures.append(f"terminal portal sync missing: {required}")
+
+    terminal_view_path = root / "Sources" / "GhosttyTerminalView.swift"
+    terminal_view_source = terminal_view_path.read_text(encoding="utf-8")
+
+    resolved_block = extract_block(terminal_view_source, "private func resolvedSurfaceSize(preferred size: CGSize?) -> CGSize")
+    bounds_index = resolved_block.find("let currentBounds = bounds.size")
+    pending_index = resolved_block.find("if let pending = pendingSurfaceSize")
+    if bounds_index < 0 or pending_index < 0 or bounds_index > pending_index:
+        failures.append("resolvedSurfaceSize() no longer prefers bounds before pendingSurfaceSize")
+
+    update_block = extract_block(terminal_view_source, "private func updateSurfaceSize(size: CGSize? = nil)")
+    if "let size = resolvedSurfaceSize(preferred: size)" not in update_block:
+        failures.append("updateSurfaceSize() no longer resolves size via resolvedSurfaceSize()")
+
+    if failures:
+        print("FAIL: terminal resize/portal regression guards failed")
+        for item in failures:
+            print(f" - {item}")
+        return 1
+
+    print("PASS: terminal resize/portal regression guards are in place")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

vendor/bonsplit

@@ -1 +1 @@
-Subproject commit c91868601ef27e673ca884639a724f2d10fcd54d
+Subproject commit 2d0d05aad8e1c2c1c56c290718063f9b53408849