Provide access to Arc<winit:🪟:Window>

This simplifies managing safely accessing the raw window handle,
allowing the window thread to pass a reference back to the app thread
using an app event.

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   This new function properly updates the `inner_size` and `outer_size` when the
   underlying window is resized immediately. Notably, this happens on Wayland but
   may happen on some other platforms as well.
+- `RunningWindow::winit` now returns an `Arc` wrapped winit window.
 
 ### Added
 

src/window.rs

@@ -318,7 +318,7 @@ where
 {
     /// Returns a reference to the underlying window.
     #[must_use]
-    pub fn winit(&self) -> &winit::window::Window {
+    pub fn winit(&self) -> &Arc<winit::window::Window> {
         &self.window
     }