try delaying notify signal

src/ui/window.rs

@@ -162,6 +162,10 @@ mod imp {
                 loop {
                     let window = window.upgrade().unwrap();
                     let listener = window.imp().mpv.wakeup_listener();
+
+                    // only send property change notifications after the event queue is drained
+                    let freeze_notify = window.freeze_notify();
+
                     while let Some(event) = window.imp().mpv.wait_event(0.0) {
                         use crate::mpv::Event;
 
@@ -186,6 +190,9 @@ mod imp {
                             _ => event!(Level::DEBUG, "unhandled {event:?}"),
                         }
                     }
+
+                    // send property change notifications now
+                    drop(freeze_notify);
                     drop(window);
                     listener.await;
                 }