Desktop: Switch to the latest unreleased version of Winit (#3177)

* Use unstable winit

* Improve

* Remove unnecessary heap indirection

desktop/src/event.rs

@@ -0,0 +1,34 @@
+use graphite_desktop_wrapper::NodeGraphExecutionResult;
+use graphite_desktop_wrapper::messages::DesktopWrapperMessage;
+
+pub(crate) enum AppEvent {
+	UiUpdate(wgpu::Texture),
+	ScheduleBrowserWork(std::time::Instant),
+	WebCommunicationInitialized,
+	DesktopWrapperMessage(DesktopWrapperMessage),
+	NodeGraphExecutionResult(NodeGraphExecutionResult),
+	CloseWindow,
+}
+
+#[derive(Clone)]
+pub(crate) struct AppEventScheduler {
+	pub(crate) proxy: winit::event_loop::EventLoopProxy,
+	pub(crate) sender: std::sync::mpsc::Sender<AppEvent>,
+}
+
+impl AppEventScheduler {
+	pub(crate) fn schedule(&self, event: AppEvent) {
+		let _ = self.sender.send(event);
+		self.proxy.wake_up();
+	}
+}
+
+pub(crate) trait CreateAppEventSchedulerEventLoopExt {
+	fn create_app_event_scheduler(&self, sender: std::sync::mpsc::Sender<AppEvent>) -> AppEventScheduler;
+}
+
+impl CreateAppEventSchedulerEventLoopExt for winit::event_loop::EventLoop {
+	fn create_app_event_scheduler(&self, sender: std::sync::mpsc::Sender<AppEvent>) -> AppEventScheduler {
+		AppEventScheduler { proxy: self.create_proxy(), sender }
+	}
+}