/**
  * Gets a list of node revision IDs for a specific node.
  *
  * @param \Drupal\node\NodeInterface
  *   The node entity.
  * @param \Drupal\node\NodeStorageInterface $node_storage
  *   The node storage handler.
  *
  * @return int[]
  *   Node revision IDs (in descending order).
  */
 protected function _getRevisionIds(NodeInterface $node, NodeStorageInterface $node_storage)
 {
     $result = $node_storage->getQuery()->allRevisions()->condition($node->getEntityType()->getKey('id'), $node->id())->sort($node->getEntityType()->getKey('revision'), 'DESC')->pager(50)->execute();
     return array_keys($result);
 }