Fix node deletion for similar paths

Author: urs-urban

lib/Gedmo/Tree/Strategy/ORM/MaterializedPath.php

@@ -23,12 +23,18 @@ public function removeNode($om, $meta, $config, $node)
         $wrapped = AbstractWrapper::wrap($node, $om);
 
         $path = addcslashes($wrapped->getPropertyValue($config['path']), '%');
+        $lvl = $wrapped->getPropertyValue($config['level']);
 
         // Remove node's children
         $qb = $om->createQueryBuilder();
         $qb->select('e')
             ->from($config['useObjectClass'], 'e')
             ->where($qb->expr()->like('e.'.$config['path'], $qb->expr()->literal($path.'%')));
+        
+        if(!empty($lvl) && $meta->hasField($config['level'])){
+            $qb->andWhere($qb->expr()->gt('e.'.$config['level'], $qb->expr()->literal($lvl)));
+        }
+        
         $results = $qb->getQuery()
             ->execute();