Fix crash when application boots from a URL event in macOS

winit/src/program.rs

@@ -650,7 +650,7 @@ async fn run_instance<P, C>(
  mut runtime: Runtime<P::Executor, Proxy<P::Message>, Action<P::Message>>,
  mut proxy: Proxy<P::Message>,
  mut debug: Debug,
- mut boot: oneshot::Receiver<Boot<C>>,
+ boot: oneshot::Receiver<Boot<C>>,
  mut event_receiver: mpsc::UnboundedReceiver<Event<Action<P::Message>>>,
  mut control_sender: mpsc::UnboundedSender<Control>,
  is_daemon: bool,
@@ -665,7 +665,7 @@ async fn run_instance<P, C>(
  let Boot {
  mut compositor,
  mut clipboard,
- } = boot.try_recv().ok().flatten().expect("Receive boot");
+ } = boot.await.expect("Receive boot");
 
  let mut window_manager = WindowManager::new();
  let mut is_window_opening = !is_daemon;
@@ -679,7 +679,18 @@ async fn run_instance<P, C>(
 
  debug.startup_finished();
 
- while let Some(event) = event_receiver.next().await {
+ loop {
+ // Empty the queue if possible
+ let event = if let Ok(event) = event_receiver.try_next() {
+ event
+ } else {
+ event_receiver.next().await
+ };
+
+ let Some(event) = event else {
+ break;
+ };
+
  match event {
  Event::WindowCreated {
  id,