macos: set title of terminal window immediately if configured (#6056)

Fixes #5934 for macOS

If a `title` config is set, this change sets the title immediately on
windowDidLoad to ensure that the window appears with the correct title
right away.

If there is any reason to set another title, the `set_title` apprt
action will come on another event loop tick (due to our usage of
notifications) but that's okay since that's already how it works. This
is just to say that setting this here won't break any shell integration
or anything.

macos/Sources/Features/Terminal/BaseTerminalController.swift

@@ -413,6 +413,14 @@ class BaseTerminalController: NSWindowController,
     override func windowDidLoad() {
         guard let window else { return }
 
+        // If there is a hardcoded title in the configuration, we set that
+        // immediately. Future `set_title` apprt actions will override this
+        // if necessary but this ensures our window loads with the proper
+        // title immediately rather than on another event loop tick (see #5934)
+        if let title = derivedConfig.title {
+            window.title = title
+        }
+
         // We always initialize our fullscreen style to native if we can because
         // initialization sets up some state (i.e. observers). If its set already
         // somehow we don't do this.
@@ -617,17 +625,20 @@ class BaseTerminalController: NSWindowController,
     }
 
     private struct DerivedConfig {
+        let title: String?
         let macosTitlebarProxyIcon: Ghostty.MacOSTitlebarProxyIcon
         let windowStepResize: Bool
         let focusFollowsMouse: Bool
 
         init() {
+            self.title = nil
             self.macosTitlebarProxyIcon = .visible
             self.windowStepResize = false
             self.focusFollowsMouse = false
         }
 
         init(_ config: Ghostty.Config) {
+            self.title = config.title
             self.macosTitlebarProxyIcon = config.macosTitlebarProxyIcon
             self.windowStepResize = config.windowStepResize
             self.focusFollowsMouse = config.focusFollowsMouse

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -132,6 +132,15 @@ extension Ghostty {
             return v
         }
 
+        var title: String? {
+            guard let config = self.config else { return nil }
+            var v: UnsafePointer<Int8>? = nil
+            let key = "title"
+            guard ghostty_config_get(config, &v, key, UInt(key.count)) else { return nil }
+            guard let ptr = v else { return nil }
+            return String(cString: ptr)
+        }
+
         var windowSaveState: String {
             guard let config = self.config else { return "" }
             var v: UnsafePointer<Int8>? = nil