@Override
  public boolean canShow(@NotNull DiffContext context, @NotNull DiffRequest request) {
    return SimpleOnesideDiffViewer.canShowRequest(context, request) ||
           SimpleDiffViewer.canShowRequest(context, request) ||
           SimpleThreesideDiffViewer.canShowRequest(context, request);
  }
@Override
  public boolean canShow(@NotNull DiffContext context, @NotNull DiffRequest request)