hasUntranslatableFieldsChanges example

// To avoid unintentional reverts and data losses, we forbid changes to     // untranslatable fields in pending revisions for multilingual entities. The     // only case where changes in pending revisions are acceptable is when     // untranslatable fields affect only the default translation, in which case     // a pending revision contains only one affected translation. Even in this     // case, multiple translations would be affected in a single revision, if we     // allowed changes to untranslatable fields while editing non-default     // translations, so that is forbidden too. For the same reason, when changes     // to untranslatable fields affect all translations, we can only allow them     // in default revisions.     if ($this->hasUntranslatableFieldsChanges($entity)) {
      if ($entity->isDefaultTranslationAffectedOnly()) {
        foreach ($entity->getTranslationLanguages(FALSE) as $langcode => $language) {
          if ($entity->getTranslation($langcode)->hasTranslationChanges()) {
            $this->context->addViolation($constraint->defaultTranslationMessage);
            break;
          }
        }
      }
      else {
        $this->context->addViolation($constraint->defaultRevisionMessage);
      }
    }