@Override
    public void onViewerCreated(@NotNull DiffViewer diffViewer, @NotNull DiffContext context, @NotNull DiffRequest request) {
      if (diffViewer instanceof DiffViewerBase viewer) {
        viewer.addListener(new MyDiffViewerListener(viewer));
      }
    }
@Override
    public void onViewerCreated(@NotNull DiffViewer diffViewer, @NotNull DiffContext context, @NotNull DiffRequest request)