/**
* Returns the maximum depth of the possible parents of the menu link.
*
* @param string $id
* The menu link plugin ID or an empty value for a new link.
*
* @return int
* The depth related to the depth of the given menu link.
*/
protected function getParentDepthLimit($id)
{
if ($id) {
$limit = $this->menuLinkTree->maxDepth() - $this->menuLinkTree->getSubtreeHeight($id);
} else {
$limit = $this->menuLinkTree->maxDepth() - 1;
}
return $limit;
}
