Windows: fix initial active status (#9694)

Separate from #9451

On Windows, a new window may already active immediate after creation.

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/gpui/src/platform/linux/wayland/window.rs

@@ -346,6 +346,11 @@ impl PlatformWindow for WaylandWindow {
         // todo(linux)
     }
 
+    // todo(linux)
+    fn is_active(&self) -> bool {
+        false
+    }
+
     fn set_title(&mut self, title: &str) {
         self.0.toplevel.set_title(title.to_string());
     }

crates/gpui/src/platform/linux/x11/window.rs

@@ -406,6 +406,11 @@ impl PlatformWindow for X11Window {
             .unwrap();
     }
 
+    // todo(linux)
+    fn is_active(&self) -> bool {
+        false
+    }
+
     fn set_title(&mut self, title: &str) {
         self.0
             .xcb_connection

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

@@ -916,6 +916,10 @@ impl PlatformWindow for MacWindow {
             .detach();
     }
 
+    fn is_active(&self) -> bool {
+        unsafe { self.0.lock().native_window.isKeyWindow() == YES }
+    }
+
     fn set_title(&mut self, title: &str) {
         unsafe {
             let app = NSApplication::sharedApplication(nil);

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

@@ -181,6 +181,10 @@ impl PlatformWindow for TestWindow {
             .set_active_window(Some(self.clone()))
     }
 
+    fn is_active(&self) -> bool {
+        false
+    }
+
     fn set_title(&mut self, title: &str) {
         self.0.lock().title = Some(title.to_owned());
     }

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

@@ -1389,6 +1389,10 @@ impl PlatformWindow for WindowsWindow {
         unsafe { SetForegroundWindow(self.inner.hwnd) };
     }
 
+    fn is_active(&self) -> bool {
+        self.inner.hwnd == unsafe { GetActiveWindow() }
+    }
+
     // todo(windows)
     fn set_title(&mut self, title: &str) {
         unsafe { SetWindowTextW(self.inner.hwnd, &HSTRING::from(title)) }