@Override
  public @Nullable FileModifier getFileModifierForPreview(@NotNull PsiFile target) {
    GrTypeDefinition element = myPsiClassPointer.getElement();
    if (element == null) {
      return null;
    }
    GrTypeDefinition copy = PsiTreeUtil.findSameElementInCopy(element, target);
    return new AddClassToExtendsFix(copy, myInterfaceName);
  }
@Override
  public @Nullable FileModifier getFileModifierForPreview(@NotNull PsiFile target)