support composite menu-item

packages/menu/src/menu-item.vue

@@ -14,7 +14,7 @@
     tabindex="-1"
   >
     <el-tooltip
-      v-if="$parent === rootMenu && rootMenu.collapse"
+      v-if="parentMenu.$options.componentName === 'ElMenu' && rootMenu.collapse"
       effect="dark"
       placement="right">
       <div slot="content"><slot name="title"></slot></div>