Merge pull request #2912 from mauriciocolli/fix-wrong-thread-access

Fix for player access out of its creation thread

app/src/main/java/org/schabi/newpipe/player/playback/MediaSourceManager.java

@@ -319,6 +319,7 @@ public class MediaSourceManager {
 
     private Observable<Long> getEdgeIntervalSignal() {
         return Observable.interval(progressUpdateIntervalMillis, TimeUnit.MILLISECONDS)
+                .observeOn(AndroidSchedulers.mainThread())
                 .filter(ignored ->
                         playbackListener.isApproachingPlaybackEdge(playbackNearEndGapMillis));
     }