Fix visual bell getting stuck on macOS

Fixes alacritty#7325.

alacritty/src/display/window.rs

@@ -235,9 +235,7 @@ impl Window {
 
     #[inline]
     pub fn request_redraw(&mut self) {
-        // No need to request a frame when we don't have one. The next `Frame` event will check the
-        // `dirty` flag on the display and submit a redraw request.
-        if self.has_frame && !self.requested_redraw {
+        if !self.requested_redraw {
             self.requested_redraw = true;
             self.window.request_redraw();
         }

alacritty/src/window_context.rs

@@ -380,7 +380,13 @@ impl WindowContext {
 
         // Request immediate re-draw if visual bell animation is not finished yet.
         if !self.display.visual_bell.completed() {
-            self.display.window.request_redraw();
+            // We can get an OS redraw which by-passes alacritty's _frame_ throttling, thus
+            // mark the window as dirty when we don't have frame yet.
+            if self.display.window.has_frame {
+                self.display.window.request_redraw();
+            } else {
+                self.dirty = true;
+            }
         }
 
         // Redraw the window.
@@ -481,6 +487,7 @@ impl WindowContext {
         // Don't call `request_redraw` when event is `RedrawRequested` since the `dirty` flag
         // represents the current frame, but redraw is for the next frame.
         if self.dirty
+            && self.display.window.has_frame
             && !self.occluded
             && !matches!(event, WinitEvent::WindowEvent { event: WindowEvent::RedrawRequested, .. })
         {