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Skip background glass effect on macOS 26 to fix blank window

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The transparency setup (non-opaque window + clear subview backgrounds)
required for the glass effect breaks SwiftUI content rendering on
macOS 26. Disable background glass when NSGlassEffectView is available
until a proper macOS 26 implementation is found.
This commit is contained in:
Lawrence Chen 2026-02-08 17:40:10 -08:00
parent 09f27d91f1
commit 082aef6a53
1 changed files with 4 additions and 5 deletions
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9
Sources/ContentView.swift
View file

@ -360,23 +360,22 @@ struct ContentView: View {
window.identifier = NSUserInterfaceItemIdentifier("cmux.main")
window.titlebarAppearsTransparent = true
window.styleMask.insert(.fullSizeContentView)
// For behindWindow blur to work, window must be non-opaque with transparent content view
if sidebarBlendMode == SidebarBlendModeOption.behindWindow.rawValue && bgGlassEnabled {
// Background glass: skip on macOS 26+ where NSGlassEffectView causes blank SwiftUI content.
// The transparency setup (non-opaque window + clear subview backgrounds) breaks rendering.
if sidebarBlendMode == SidebarBlendModeOption.behindWindow.rawValue && bgGlassEnabled
&& !WindowGlassEffect.isAvailable {
window.isOpaque = false
window.backgroundColor = .clear
// Configure contentView and all subviews for transparency
if let contentView = window.contentView {
contentView.wantsLayer = true
contentView.layer?.backgroundColor = NSColor.clear.cgColor
contentView.layer?.isOpaque = false
// Make SwiftUI hosting view transparent
for subview in contentView.subviews {
subview.wantsLayer = true
subview.layer?.backgroundColor = NSColor.clear.cgColor
subview.layer?.isOpaque = false
}
}
// Apply liquid glass effect to the window with tint from settings
let tintColor = (NSColor(hex: bgGlassTintHex) ?? .black).withAlphaComponent(bgGlassTintOpacity)
WindowGlassEffect.apply(to: window, tintColor: tintColor)
}