fix(PlayerElement): wait for next tick so element is mounted before setting source (#2549)

Signed-off-by: Fernando Fernández <ferferga@hotmail.com>

Author: ferferga

frontend/src/components/Playback/PlayerElement.vue

@@ -203,11 +203,16 @@ watch(mediaElementRef, async () => {
 });
 
 watch(playbackManager.currentSourceUrl,
-  (newUrl) => {
+  async (newUrl) => {
     if (hls) {
       hls.stopLoad();
     }
 
+    /**
+     * Ensure element is mounted before setting the source.
+     */
+    await nextTick();
+
     if (
       mediaElementRef.value
       && (!newUrl