Implement default macOS menu items

- `Zed -> Hide`, bound to `cmd-h`
- `Zed -> Hide Others`, bound to `alt-cmd-h`
- `Zed -> Show All`
- `Window -> Minimize`, bound to `cmd-m`
- `Window -> Zoom`

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

@@ -456,6 +456,27 @@ impl platform::Platform for MacPlatform {
         self.fonts.clone()
     }
 
+    fn hide(&self) {
+        unsafe {
+            let app = NSApplication::sharedApplication(nil);
+            let _: () = msg_send![app, hide: nil];
+        }
+    }
+
+    fn hide_other_apps(&self) {
+        unsafe {
+            let app = NSApplication::sharedApplication(nil);
+            let _: () = msg_send![app, hideOtherApplications: nil];
+        }
+    }
+
+    fn unhide_other_apps(&self) {
+        unsafe {
+            let app = NSApplication::sharedApplication(nil);
+            let _: () = msg_send![app, unhideAllApplications: nil];
+        }
+    }
+
     fn quit(&self) {
         // Quitting the app causes us to close windows, which invokes `Window::on_close` callbacks
         // synchronously before this method terminates. If we call `Platform::quit` while holding a

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

@@ -568,6 +568,25 @@ impl platform::Window for Window {
             let _: () = msg_send![app, orderFrontCharacterPalette: window];
         }
     }
+
+    fn minimize(&self) {
+        let window = self.0.borrow().native_window;
+        unsafe {
+            window.miniaturize_(nil);
+        }
+    }
+
+    fn zoom(&self) {
+        let this = self.0.borrow();
+        let window = this.native_window;
+        this.executor
+            .spawn(async move {
+                unsafe {
+                    window.zoom_(nil);
+                }
+            })
+            .detach();
+    }
 }
 
 impl platform::WindowContext for Window {

crates/gpui/src/platform/test.rs

@@ -135,6 +135,12 @@ impl super::Platform for Platform {
         None
     }
 
+    fn hide(&self) {}
+
+    fn hide_other_apps(&self) {}
+
+    fn unhide_other_apps(&self) {}
+
     fn quit(&self) {}
 
     fn write_to_clipboard(&self, item: ClipboardItem) {
@@ -278,6 +284,10 @@ impl super::Window for Window {
     }
 
     fn show_character_palette(&self) {}
+
+    fn minimize(&self) {}
+
+    fn zoom(&self) {}
 }
 
 pub fn platform() -> Platform {