@Override
  public @NotNull IntentionPreviewInfo generatePreview(@NotNull Project project, @NotNull Editor editor, @NotNull PsiFile file) {
    GrParameter parameter = getParameter(editor, file);
    if (parameter == null) {
      return IntentionPreviewInfo.EMPTY;
    }
    parameter.delete();
    return IntentionPreviewInfo.DIFF;
  }
@Override
  public @NotNull IntentionPreviewInfo generatePreview(@NotNull Project project, @NotNull Editor editor, @NotNull PsiFile file)