pub fn move_window_to_top(&mut self, window: &Rc<Window>) {
     let window_idx = self
         .windows
         .iter()
         .position(|w| Rc::ptr_eq(w, window))
         .unwrap();
     self.windows.remove(window_idx);
     self.windows.insert(0, Rc::clone(window));
+    self.recompute_drawable_regions_in_rect(window.frame());
 }