Fix panic when destroying window (#2773)

* Fix crash when destroying window

* Add a comment to draw_rect

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Co-authored-by: Xiaopeng Li <lixiaopeng.jetspark@bytedance.com>

src/platform_impl/macos/view.rs

@@ -243,7 +243,10 @@ declare_class!(
         fn draw_rect(&mut self, rect: NSRect) {
             trace_scope!("drawRect:");
 
-            AppState::handle_redraw(self.window_id());
+            // It's a workaround for https://github.com/rust-windowing/winit/issues/2640, don't replace with `self.window_id()`.
+            if let Some(window) = self._ns_window.load() {
+                AppState::handle_redraw(WindowId(window.id()));
+            }
 
             #[allow(clippy::let_unit_value)]
             unsafe {