macos: only show confirm quit on focused window

macos/Ghostty.xcodeproj/project.pbxproj

@@ -21,6 +21,7 @@
 		A5CEAFFF29C2410700646FDA /* Backport.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5CEAFFE29C2410700646FDA /* Backport.swift */; };
 		A5D495A2299BEC7E00DD1313 /* GhosttyKit.xcframework in Frameworks */ = {isa = PBXBuildFile; fileRef = A5D495A1299BEC7E00DD1313 /* GhosttyKit.xcframework */; };
 		A5FECBD729D1FC3900022361 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5FECBD629D1FC3900022361 /* ContentView.swift */; };
+		A5FECBD929D2010400022361 /* WindowAccessor.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5FECBD829D2010400022361 /* WindowAccessor.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -40,6 +41,7 @@
 		A5CEAFFE29C2410700646FDA /* Backport.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Backport.swift; sourceTree = "<group>"; };
 		A5D495A1299BEC7E00DD1313 /* GhosttyKit.xcframework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcframework; path = GhosttyKit.xcframework; sourceTree = "<group>"; };
 		A5FECBD629D1FC3900022361 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
+		A5FECBD829D2010400022361 /* WindowAccessor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WindowAccessor.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -66,6 +68,7 @@
 				A59444F629A2ED5200725BBA /* SettingsView.swift */,
 				A5CEAFFE29C2410700646FDA /* Backport.swift */,
 				A5FECBD629D1FC3900022361 /* ContentView.swift */,
+				A5FECBD829D2010400022361 /* WindowAccessor.swift */,
 			);
 			path = Sources;
 			sourceTree = "<group>";
@@ -201,6 +204,7 @@
 				A55B7BB629B6F47F0055DE60 /* AppState.swift in Sources */,
 				A5CEAFDC29B8009000646FDA /* SplitView.swift in Sources */,
 				A55685E029A03A9F004303CE /* AppError.swift in Sources */,
+				A5FECBD929D2010400022361 /* WindowAccessor.swift in Sources */,
 				A535B9DA299C569B0017E2E4 /* ErrorView.swift in Sources */,
 				A5B30535299BEAAA0047F10C /* GhosttyApp.swift in Sources */,
 				A5CEAFFF29C2410700646FDA /* Backport.swift in Sources */,

macos/Sources/ContentView.swift

@@ -4,8 +4,13 @@ import GhosttyKit
 struct ContentView: View {
     let ghostty: Ghostty.AppState
     
+    // We need access to our app delegate to know if we're quitting or not.
     @EnvironmentObject private var appDelegate: AppDelegate
     
+    // We need access to our window to know if we're the key window to determine
+    // if we show the quit confirmation or not.
+    @State private var window: NSWindow?
+    
     var body: some View {
         switch ghostty.readiness {
         case .loading:
@@ -21,11 +26,18 @@ struct ContentView: View {
                     NSApplication.shared.reply(toApplicationShouldTerminate: true)
                 }
         case .ready:
+            let confirmQuitting = Binding<Bool>(get: {
+                self.appDelegate.confirmQuit && (self.window?.isKeyWindow ?? false)
+            }, set: {
+                self.appDelegate.confirmQuit = $0
+            })
+                                                        
             Ghostty.TerminalSplit(onClose: Self.closeWindow)
                 .ghosttyApp(ghostty.app!)
+                .background(WindowAccessor(window: $window))
                 .confirmationDialog(
                     "Quit Ghostty?",
-                    isPresented: $appDelegate.confirmQuit) {
+                    isPresented: confirmQuitting) {
                         Button("Close Ghostty", role: .destructive) {
                             NSApplication.shared.reply(toApplicationShouldTerminate: true)
                         }

macos/Sources/WindowAccessor.swift

@@ -0,0 +1,16 @@
+import SwiftUI
+
+/// Allows accessing the window that this view is a part of.
+struct WindowAccessor: NSViewRepresentable {
+    @Binding var window: NSWindow?
+    
+    func makeNSView(context: Context) -> NSView {
+        let view = NSView()
+        DispatchQueue.main.async {
+            self.window = view.window
+        }
+        return view
+    }
+    
+    func updateNSView(_ nsView: NSView, context: Context) {}
+}