notify ShuffleOrder when media item(s) are moved

Issue: #1932
Issue: #1381

Author: nift4

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayerImpl.java

@@ -697,7 +697,7 @@ public void moveMediaItems(int fromIndex, int toIndex, int newFromIndex) {
     }
     Timeline oldTimeline = getCurrentTimeline();
     pendingOperationAcks++;
-    Util.moveItems(mediaSourceHolderSnapshots, fromIndex, toIndex, newFromIndex);
+    moveMediaSourceHolders(fromIndex, toIndex, newFromIndex);
     Timeline newTimeline = createMaskingTimeline();
     PlaybackInfo newPlaybackInfo =
         maskTimelineAndPosition(
@@ -719,6 +719,11 @@ public void moveMediaItems(int fromIndex, int toIndex, int newFromIndex) {
         /* repeatCurrentMediaItem= */ false);
   }
 
+  private void moveMediaSourceHolders(int fromIndex, int toIndex, int newFromIndex) {
+    Util.moveItems(mediaSourceHolderSnapshots, fromIndex, toIndex, newFromIndex);
+    shuffleOrder = shuffleOrder.cloneAndMove(fromIndex, toIndex, newFromIndex);
+  }
+
   @Override
   public void replaceMediaItems(int fromIndex, int toIndex, List<MediaItem> mediaItems) {
     verifyApplicationThread();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/ShuffleOrder.java

@@ -266,6 +266,22 @@ public ShuffleOrder cloneAndClear() {
    */
   ShuffleOrder cloneAndInsert(int insertionIndex, int insertionCount);
 
+  /**
+   * Returns a copy of the shuffle order with a range of elements moved.
+   *
+   * @param indexFrom The starting index in the unshuffled order of the range to move, from before
+   *     the move occurs.
+   * @param indexToExclusive The smallest index (must be greater or equal to {@code indexFrom}) that
+   *     is not included in the range of elements moved, from before the move occurs.
+   * @param newIndexFrom The starting index in the unshuffled order of the range to move, from after
+   *     the move occurs.
+   * @return A copy of this {@link ShuffleOrder} with the elements moved.
+   */
+  default ShuffleOrder cloneAndMove(int indexFrom, int indexToExclusive, int newIndexFrom) {
+    return cloneAndRemove(indexFrom, indexToExclusive)
+        .cloneAndInsert(newIndexFrom, indexToExclusive - indexFrom);
+  }
+
   /**
    * Returns a copy of the shuffle order with a range of elements removed.
    *