Share browser context with OAuth popups (#1600)

* Add popup browser context regression tests

* Share browser context with OAuth popups

---------

Co-authored-by: Lawrence Chen <lawrencecchen@users.noreply.github.com>

Sources/Panels/BrowserPanel.swift

@@ -2447,33 +2447,9 @@ final class BrowserPanel: Panel, ObservableObject {
         websiteDataStore: WKWebsiteDataStore? = nil
     ) -> CmuxWebView {
         let config = WKWebViewConfiguration()
-        config.processPool = BrowserPanel.sharedProcessPool
-        config.mediaTypesRequiringUserActionForPlayback = []
-        // Ensure browser cookies/storage persist across navigations and launches.
-        // This reduces repeated consent/bot-challenge flows on sites like Google.
-        config.websiteDataStore = websiteDataStore ?? BrowserProfileStore.shared.websiteDataStore(for: profileID)
-
-        // Enable developer extras (DevTools)
-        config.preferences.setValue(true, forKey: "developerExtrasEnabled")
-
-        // Enable JavaScript
-        config.defaultWebpagePreferences.allowsContentJavaScript = true
-        // Keep browser console/error/dialog telemetry active from document start on every navigation.
-        config.userContentController.addUserScript(
-            WKUserScript(
-                source: Self.telemetryHookBootstrapScriptSource,
-                injectionTime: .atDocumentStart,
-                forMainFrameOnly: false
-            )
-        )
-        // Track the last editable focused element continuously so omnibar exit can
-        // restore page input focus even if capture runs after first-responder handoff.
-        config.userContentController.addUserScript(
-            WKUserScript(
-                source: Self.addressBarFocusTrackingBootstrapScript,
-                injectionTime: .atDocumentStart,
-                forMainFrameOnly: false
-            )
+        configureWebViewConfiguration(
+            config,
+            websiteDataStore: websiteDataStore ?? BrowserProfileStore.shared.websiteDataStore(for: profileID)
         )
 
         let webView = CmuxWebView(frame: .zero, configuration: config)
@@ -2489,6 +2465,41 @@ final class BrowserPanel: Panel, ObservableObject {
         return webView
     }
 
+    static func configureWebViewConfiguration(
+        _ configuration: WKWebViewConfiguration,
+        websiteDataStore: WKWebsiteDataStore,
+        processPool: WKProcessPool = BrowserPanel.sharedProcessPool
+    ) {
+        configuration.processPool = processPool
+        configuration.mediaTypesRequiringUserActionForPlayback = []
+        // Ensure browser cookies/storage persist across navigations and launches.
+        // This reduces repeated consent/bot-challenge flows on sites like Google.
+        configuration.websiteDataStore = websiteDataStore
+
+        // Enable developer extras (DevTools)
+        configuration.preferences.setValue(true, forKey: "developerExtrasEnabled")
+
+        // Enable JavaScript
+        configuration.defaultWebpagePreferences.allowsContentJavaScript = true
+        // Keep browser console/error/dialog telemetry active from document start on every navigation.
+        configuration.userContentController.addUserScript(
+            WKUserScript(
+                source: Self.telemetryHookBootstrapScriptSource,
+                injectionTime: .atDocumentStart,
+                forMainFrameOnly: false
+            )
+        )
+        // Track the last editable focused element continuously so omnibar exit can
+        // restore page input focus even if capture runs after first-responder handoff.
+        configuration.userContentController.addUserScript(
+            WKUserScript(
+                source: Self.addressBarFocusTrackingBootstrapScript,
+                injectionTime: .atDocumentStart,
+                forMainFrameOnly: false
+            )
+        )
+    }
+
     private func bindWebView(_ webView: CmuxWebView) {
         webView.onContextMenuDownloadStateChanged = { [weak self] downloading in
             if downloading {

Sources/Panels/BrowserPopupWindowController.swift

@@ -92,13 +92,24 @@ final class BrowserPopupWindowController: NSObject, NSWindowDelegate {
         self.parentPopupController = parentPopupController
         self.nestingDepth = nestingDepth
 
-        // Create popup web view with WebKit's supplied configuration (preserves
-        // internal browsing-context state for opener linkage / postMessage).
+        let browserContextSource = parentPopupController?.webView.configuration ?? openerPanel?.webView.configuration
+        if let browserContextSource {
+            BrowserPanel.configureWebViewConfiguration(
+                configuration,
+                websiteDataStore: browserContextSource.websiteDataStore,
+                processPool: browserContextSource.processPool
+            )
+        }
+
+        // Create popup web view with WebKit's supplied configuration after
+        // overlaying the opener's browser context so OAuth popups keep cmux's
+        // shared cookie/storage scope and opener linkage.
         let webView = CmuxWebView(frame: .zero, configuration: configuration)
         webView.allowsBackForwardNavigationGestures = true
         if #available(macOS 13.3, *) {
             webView.isInspectable = true
         }
+        webView.underPageBackgroundColor = GhosttyBackgroundTheme.currentColor()
         webView.customUserAgent = BrowserUserAgentSettings.safariUserAgent
         self.webView = webView
 

cmuxTests/GhosttyConfigTests.swift

@@ -1003,6 +1003,48 @@ final class GhosttyTerminalStartupEnvironmentTests: XCTestCase {
     }
 }
 
+@MainActor
+final class BrowserPanelPopupContextTests: XCTestCase {
+    func testFloatingPopupInheritsOpenerBrowserContext() throws {
+        let panel = BrowserPanel(workspaceId: UUID(), isRemoteWorkspace: false)
+        let popupWebView = try XCTUnwrap(
+            panel.createFloatingPopup(
+                configuration: WKWebViewConfiguration(),
+                windowFeatures: WKWindowFeatures()
+            )
+        )
+        defer { popupWebView.window?.close() }
+
+        XCTAssertTrue(
+            popupWebView.configuration.processPool === panel.webView.configuration.processPool
+        )
+        XCTAssertTrue(
+            popupWebView.configuration.websiteDataStore === panel.webView.configuration.websiteDataStore
+        )
+    }
+
+    func testFloatingPopupInheritsRemoteWorkspaceWebsiteDataStore() throws {
+        let remoteWorkspaceId = UUID()
+        let panel = BrowserPanel(
+            workspaceId: remoteWorkspaceId,
+            isRemoteWorkspace: true,
+            remoteWebsiteDataStoreIdentifier: remoteWorkspaceId
+        )
+        let popupWebView = try XCTUnwrap(
+            panel.createFloatingPopup(
+                configuration: WKWebViewConfiguration(),
+                windowFeatures: WKWindowFeatures()
+            )
+        )
+        defer { popupWebView.window?.close() }
+
+        XCTAssertTrue(
+            popupWebView.configuration.websiteDataStore === panel.webView.configuration.websiteDataStore
+        )
+        XCTAssertFalse(popupWebView.configuration.websiteDataStore === WKWebsiteDataStore.default())
+    }
+}
+
 @MainActor
 final class BrowserPanelRemoteStoreTests: XCTestCase {
     func testRemoteWorkspacePanelsShareWorkspaceScopedWebsiteDataStore() {