From 082aef6a53fbc5bdd48f45cfa6a273f1332bbf49 Mon Sep 17 00:00:00 2001
From: Lawrence Chen <54008264+lawrencecchen@users.noreply.github.com>
Date: Sun, 8 Feb 2026 17:40:10 -0800
Subject: [PATCH] Skip background glass effect on macOS 26 to fix blank window

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.
---
 Sources/ContentView.swift | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Sources/ContentView.swift b/Sources/ContentView.swift
index 56a2c62b..a1001b1b 100644
--- a/Sources/ContentView.swift
+++ b/Sources/ContentView.swift
@@ -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)
             }