Fix hevc decode error "Could not find ref with POC" (#9960)

1. Dropping frames can cause this error, reset encoder when this
   happens.
2. There are some logic error for clear video queue, because video queue
   message is not cleared. This need to be fixed.

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/client/io_loop.rs

@@ -1146,9 +1146,13 @@ impl<T: InvokeUiSession> Remote<T> {
                             .ok();
                     } else {
                         if let Some(video_queue) = video_queue_write.get_mut(&display) {
-                            video_queue.force_push(vf);
+                            if video_queue.force_push(vf).is_some() {
+                                while let Some(_) = video_queue.pop() {}
+                                self.handler.refresh_video(display as _);
+                            } else {
+                                self.video_sender.send(MediaData::VideoQueue(display)).ok();
+                            }
                         }
-                        self.video_sender.send(MediaData::VideoQueue(display)).ok();
                     }
                     self.fps_control
                         .last_active_time