fix #1843 (#1844)

* fix #1843
Remove categroy name-exists detecting

* detect category-exists only in the same level

var/Widget/Metas/Category/Edit.php

@@ -56,6 +56,7 @@ class Edit extends Metas implements ActionInterface
 
     /**
      * 判断分类名称是否存在
+     * fix #1843 将重复性判断限制在同一父分类下
      *
      * @param string $name 分类名称
      * @return boolean
@@ -73,6 +74,9 @@ class Edit extends Metas implements ActionInterface
             $select->where('mid <> ?', $this->request->get('mid'));
         }
 
+        // 只在同一父分类下判断重复性
+        $select->where('parent = ?', $this->request->filter('int')->get('parent', 0));
+
         $category = $this->db->fetchRow($select);
         return !$category;
     }