Merge pull request #2225 from 21pages/portable-service

portable-service: enable quick support by rename as xxxqs.exe

flutter/lib/desktop/pages/connection_page.dart

@@ -90,12 +90,15 @@ class _ConnectionPageState extends State<ConnectionPage>
         Get.forceAppUpdate();
       }
       isWindowMinisized = false;
-    } else if (eventName == 'close') {
-      // called more then one time
-      bind.mainOnMainWindowClose();
     }
   }
 
+  @override
+  void onWindowClose() {
+    super.onWindowClose();
+    bind.mainOnMainWindowClose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Column(