isAnyRevisionTranslated example

  public function createRevision(RevisionableInterface $entity, $default = TRUE, $keep_untranslatable_fields = NULL) {
    /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
    $new_revision = clone $entity;

    $original_keep_untranslatable_fields = $keep_untranslatable_fields;

    // For translatable entities, create a merged revision of the active     // translation and the other translations in the default revision. This     // permits the creation of pending revisions that can always be saved as the     // new default revision without reverting changes in other languages.     if (!$entity->isNew() && !$entity->isDefaultRevision() && $entity->isTranslatable() && $this->isAnyRevisionTranslated($entity)) {
      $active_langcode = $entity->language()->getId();
      $skipped_field_names = array_flip($this->getRevisionTranslationMergeSkippedFieldNames());

      // By default we copy untranslatable field values from the default       // revision, unless they are configured to affect only the default       // translation. This way we can ensure we always have only one affected       // translation in pending revisions. This constraint is enforced by       // EntityUntranslatableFieldsConstraintValidator.       if (!isset($keep_untranslatable_fields)) {
        $keep_untranslatable_fields = $entity->isDefaultTranslation() && $entity->isDefaultTranslationAffectedOnly();
      }