mod: handle dispose

lib/pages/search/view.dart

@@ -25,6 +25,12 @@ class _SearchPageState extends State<SearchPage> with RouteAware {
     _futureBuilderFuture = _searchController.queryHotSearchList();
   }
 
+  @override
+  void dispose() {
+    _searchController.searchFocusNode.dispose();
+    super.dispose();
+  }
+
   @override
   // 返回当前页面时
   void didPopNext() async {