@Override
  public void addListener(@NotNull DiffEditorViewerListener listener, @Nullable Disposable disposable) {
    addListener(new DiffRequestProcessorListener() {
      @Override
      public void onViewerChanged() {
        listener.onActiveFileChanged();
      }
    }, disposable);
  }
@Override
  public void addListener(@NotNull DiffEditorViewerListener listener, @Nullable Disposable disposable)