@Nullable
  private static LocalQuickFix createFixForNonAnnotatedOverridesNotNull(PsiMethod method,
                                                                        PsiMethod superMethod) {
    NullableNotNullManager nullableManager = getNullityManager(method);
    return AnnotationUtil.isAnnotatingApplicable(method, nullableManager.getDefaultNotNull())
                              ? AddAnnotationPsiFix.createAddNotNullFix(method)
                              : createChangeDefaultNotNullFix(nullableManager, superMethod);
  }
@Nullable
  private static LocalQuickFix createFixForNonAnnotatedOverridesNotNull(PsiMethod method,
                                                                        PsiMethod superMethod)