ContentEntityBase::setNewRevision

public ContentEntityBase::setNewRevision($value = TRUE)

public function setNewRevision($value = TRUE) {
  if (!$this->getEntityType()->hasKey('revision')) {
    throw new \LogicException("Entity type {$this->getEntityTypeId()} does not support revisions.");
  }

  if ($value && !$this->newRevision) {
    // When saving a new revision, set any existing revision ID to NULL so as
    // to ensure that a new revision will actually be created.
    $this->set($this->getEntityType()->getKey('revision'), NULL);

    // Make sure that the flag tracking which translations are affected by the
    // current revision is reset.
    foreach ($this->translations as $langcode => $data) {
      // But skip removed translations.
      if ($this->hasTranslation($langcode)) {
        $this->getTranslation($langcode)->setRevisionTranslationAffected(NULL);
      }
    }
  }

  $this->newRevision = $value;
}