Refactor notifying method in PlayQueue.

Author: Isira-Seneviratne

app/src/main/java/org/schabi/newpipe/player/playqueue/AbstractInfoPlayQueue.java

@@ -82,7 +82,7 @@ public void onSuccess(@NonNull final T result) {
             public void onError(@NonNull final Throwable e) {
                 Log.e(getTag(), "Error fetching more playlist, marking playlist as complete.", e);
                 isComplete = true;
-                append(); // Notify change
+                notifyChange();
             }
         };
     }
@@ -117,7 +117,7 @@ public void onSuccess(
             public void onError(@NonNull final Throwable e) {
                 Log.e(getTag(), "Error fetching more playlist, marking playlist as complete.", e);
                 isComplete = true;
-                append(); // Notify change
+                notifyChange();
             }
         };
     }

app/src/main/java/org/schabi/newpipe/player/playqueue/PlayQueue.java

@@ -257,13 +257,10 @@ public synchronized void offsetIndex(final int offset) {
     }
 
     /**
-     * Appends the given {@link PlayQueueItem}s to the current play queue.
-     *
-     * @see #append(List items)
-     * @param items {@link PlayQueueItem}s to append
+     * Notifies that a change has occurred.
      */
-    public synchronized void append(@NonNull final PlayQueueItem... items) {
-        append(List.of(items));
+    public synchronized void notifyChange() {
+        broadcast(new AppendEvent(0));
     }
 
     /**