macos: zoomed splits put an emoji in the title bar

macos/Sources/Features/Primary Window/PrimaryView.swift

@@ -26,6 +26,7 @@ struct PrimaryView: View {
     
     @FocusedValue(\.ghosttySurfaceView) private var focusedSurface
     @FocusedValue(\.ghosttySurfaceTitle) private var surfaceTitle
+    @FocusedValue(\.ghosttySurfaceZoomed) private var zoomedSplit
     
     // This is true if this view should be the one to show the quit confirmation.
     var ownsQuitConfirmation: Bool {
@@ -49,6 +50,25 @@ struct PrimaryView: View {
         return window == firstWindow
     }
     
+    // The title for our window
+    private var title: String {
+        var title = "👻"
+        
+        if let surfaceTitle = surfaceTitle {
+            if (surfaceTitle.count > 0) {
+                title = surfaceTitle
+            }
+        }
+        
+        if let zoomedSplit = zoomedSplit {
+            if zoomedSplit {
+                title = "🔍 " + title
+            }
+        }
+        
+        return title
+    }
+    
     var body: some View {
         switch ghostty.readiness {
         case .loading:
@@ -84,12 +104,11 @@ struct PrimaryView: View {
                 .onChange(of: focusedSurface) { newValue in
                     self.focusedSurfaceWrapper.surface = newValue?.surface
                 }
-                .onChange(of: surfaceTitle) { newValue in
+                .onChange(of: title) { newValue in
                     // We need to handle this manually because we are using AppKit lifecycle
                     // so navigationTitle no longer works.
                     guard let window = self.window else { return }
-                    guard let title = newValue else { return }
-                    window.title = title
+                    window.title = newValue
                 }
                 .confirmationDialog(
                     "Quit Ghostty?",

macos/Sources/Ghostty/Ghostty.SplitView.swift

@@ -33,6 +33,7 @@ extension Ghostty {
                         SurfaceWrapper(surfaceView: surfaceView)
                     }
                 }
+                .focusedValue(\.ghosttySurfaceZoomed, zoomedSurface != nil)
             }
         }
     }

macos/Sources/Ghostty/SurfaceView.swift

@@ -710,3 +710,13 @@ extension FocusedValues {
     }
 }
 
+extension FocusedValues {
+    var ghosttySurfaceZoomed: Bool? {
+        get { self[FocusedGhosttySurfaceZoomed.self] }
+        set { self[FocusedGhosttySurfaceZoomed.self] = newValue }
+    }
+    
+    struct FocusedGhosttySurfaceZoomed: FocusedValueKey {
+        typealias Value = Bool
+    }
+}