Request a redraw when a window is resized

If we do not request it, macOS does not get any
`RedrawRequested` events. Shouldn't `winit`
[take care of this]? Probably a bug.

[take care of this]: https://docs.rs/winit/0.30.5/winit/event/enum.WindowEvent.html#variant.RedrawRequested

winit/src/program.rs

@@ -995,6 +995,13 @@ async fn run_instance<P, C>(
                             continue;
                         };
 
+                        if matches!(
+                            window_event,
+                            winit::event::WindowEvent::Resized(_)
+                        ) {
+                            window.raw.request_redraw();
+                        }
+
                         if matches!(
                             window_event,
                             winit::event::WindowEvent::CloseRequested