@Override
  public void showDiff(@Nullable Project project, @NotNull DiffRequestChain requests, @NotNull DiffDialogHints hints) {
    if (ExternalDiffTool.isEnabled()) {
      if (ExternalDiffTool.showIfNeeded(project, requests, hints)) {
        return;
      }
    }

    showDiffBuiltin(project, requests, hints);
  }
@Override
  public void showDiff(@Nullable Project project, @NotNull DiffRequestChain requests, @NotNull DiffDialogHints hints)