macOS: Drop the closure on exit. (Fixes #1058) (#1063)

CHANGELOG.md

@@ -1,5 +1,5 @@
 # Unreleased
-
+- On macOS, drop the run closure on exit.
 - On Windows, location of `WindowEvent::Touch` are window client coordinates instead of screen coordinates.
 - On X11, fix delayed events after window redraw.
 

src/platform_impl/macos/app_state.rs

@@ -196,6 +196,7 @@ impl AppState {
         HANDLER.set_in_callback(true);
         HANDLER.handle_nonuser_event(Event::LoopDestroyed);
         HANDLER.set_in_callback(false);
+        HANDLER.callback.lock().unwrap().take();
     }
 
     pub fn launched() {