Add delay before a title change to avoid flicker on macOS

macos/Sources/Features/Terminal/BaseTerminalController.swift

@@ -53,6 +53,10 @@ class BaseTerminalController: NSWindowController,
 
     /// Fullscreen state management.
     private(set) var fullscreenStyle: FullscreenStyle?
+    
+    var titleChangeDelay: TimeInterval = 0.075
+    
+    private var titleChangeTimer: Timer?
 
     /// Event monitor (see individual events for why)
     private var eventMonitor: Any? = nil
@@ -260,9 +264,12 @@ class BaseTerminalController: NSWindowController,
     func titleDidChange(to: String) {
         guard let window else { return }
         
-        // Set the main window title
-        window.title = to
+        titleChangeTimer?.invalidate()
 
+        // Set the main window title after a small delay to prevent flicker
+        titleChangeTimer = Timer.scheduledTimer(withTimeInterval: titleChangeDelay, repeats: false) { _ in
+            window.title = to
+        }
     }
     
     func pwdDidChange(to: URL?) {

macos/Sources/Features/Terminal/TerminalController.swift

@@ -26,6 +26,8 @@ class TerminalController: BaseTerminalController {
 
     /// The notification cancellable for focused surface property changes.
     private var surfaceAppearanceCancellables: Set<AnyCancellable> = []
+    
+    private var toolbarTitleChangeTimer: Timer?
 
     init(_ ghostty: Ghostty.App,
          withBaseConfig base: Ghostty.SurfaceConfiguration? = nil,
@@ -546,7 +548,13 @@ class TerminalController: BaseTerminalController {
                 // a custom view instead, we need to re-hide it.
                 window.titleVisibility = .hidden
             }
-            toolbar.titleText = to
+            
+            toolbarTitleChangeTimer?.invalidate()
+            
+            // Set the toolbar title after a small delay to prevent flicker
+            toolbarTitleChangeTimer = Timer.scheduledTimer(withTimeInterval: titleChangeDelay, repeats: false) { _ in
+                toolbar.titleText = to
+            }
         }
     }