work around notification delivery

src/ui/window.rs

@@ -654,6 +654,10 @@ mod imp {
             }
             self.state.set(State::FileLoading);
 
+            // force update the playlist-pos, in case the observed property comes later
+            self.playlist_pos
+                .set(self.mpv.get_property("playlist-pos").unwrap());
+
             // make sure this is reported as 0
             self.obj().notify("time-pos");