Add an API for setting a window's title

This controls how the window appears in the Window menu.

crates/gpui/src/platform/mac/platform.rs

@@ -202,6 +202,11 @@ impl MacForegroundPlatform {
 
             menu_bar_item.setSubmenu_(menu);
             menu_bar.addItem_(menu_bar_item);
+
+            if menu_name == "Window" {
+                let app: id = msg_send![APP_CLASS, sharedApplication];
+                app.setWindowsMenu_(menu);
+            }
         }
 
         menu_bar

crates/gpui/src/platform/mac/window.rs

@@ -386,8 +386,15 @@ impl platform::Window for Window {
     }
 
     fn activate(&self) {
+        unsafe { msg_send![self.0.borrow().native_window, makeKeyAndOrderFront: nil] }
+    }
+
+    fn set_title(&mut self, title: &str) {
         unsafe {
-            let _: () = msg_send![self.0.borrow().native_window, makeKeyAndOrderFront: nil];
+            let app = NSApplication::sharedApplication(nil);
+            let window = self.0.borrow().native_window;
+            let title = ns_string(title);
+            msg_send![app, changeWindowsItem:window title:title filename:false]
         }
     }
 }

crates/gpui/src/platform/test.rs

@@ -37,6 +37,7 @@ pub struct Window {
     event_handlers: Vec<Box<dyn FnMut(super::Event)>>,
     resize_handlers: Vec<Box<dyn FnMut()>>,
     close_handlers: Vec<Box<dyn FnOnce()>>,
+    pub(crate) title: Option<String>,
     pub(crate) pending_prompts: RefCell<VecDeque<oneshot::Sender<usize>>>,
 }
 
@@ -189,9 +190,14 @@ impl Window {
             close_handlers: Vec::new(),
             scale_factor: 1.0,
             current_scene: None,
+            title: None,
             pending_prompts: Default::default(),
         }
     }
+
+    pub fn title(&self) -> Option<String> {
+        self.title.clone()
+    }
 }
 
 impl super::Dispatcher for Dispatcher {
@@ -248,6 +254,10 @@ impl super::Window for Window {
     }
 
     fn activate(&self) {}
+
+    fn set_title(&mut self, title: &str) {
+        self.title = Some(title.to_string())
+    }
 }
 
 pub fn platform() -> Platform {