Fixed hierarchy menu

@@ -23,25 +23,35 @@ class HierarchicalMenu implements Countable, Iterator {
     private $target_lookup = Array();
 
     public function __construct(Array $menu, $parent = 0) {
-        $i = 0;
-        $last_id = -1;
+        $last_id = $i = -1;
+        $nest    = Array();
 
-        foreach ($menu as $key => $item) {
+        foreach ($menu as $key => $realitem) {
+            $item = clone $realitem;
             $item->_children = false;
 
             if ($item->menu_item_parent == $parent) {
+                $i++;
+
                 $this->contents[$i] = $item;
                 $this->id_lookup[$item->ID] = $i;
                 $this->target_lookup[$item->object_id] = $i;
 
-                $i++;
                 $last_id = $item->ID;
             } elseif ($item->menu_item_parent == $last_id) {
                 $this->contents[$this->id_lookup[$last_id]]->_children = true;
+                $nest[] = $last_id;
+
+                $last_id = $item->ID;
+            } elseif (count($nest) > 0) {
+                $last_id = array_pop($nest);
+                if (isset($this->id_lookup[$last_id])) {
+                    $this->contents[$this->id_lookup[$last_id]]->_children = true;
+                }
             }
         }
 
-        foreach ($this->contents as $key => $item) {
+        foreach ($this->contents as $key => &$item) {
             if (true === $item->_children) {
                 $item->HierarchicalMenu = new HierarchicalMenu($menu, $item->ID);
             }