Fix Tab destroy error

lib/controller.dart

@@ -236,6 +236,7 @@ class AppController {
   }
 
   healthcheck() {
+    if (globalState.healthcheckLock) return;
     for (final delay in appState.delayMap.entries) {
       setDelay(
         Delay(

lib/fragments/proxies.dart

@@ -83,12 +83,15 @@ class _ProxiesFragmentState extends State<ProxiesFragment>
               groupNames: groupNames,
             );
           },
-          builder: (_, state, __) {
-            if (_tabController != null) {
-              _tabController!.dispose();
-              _tabController = null;
+          shouldRebuild: (prev,next){
+            if(prev.groupNames.length != next.groupNames.length){
+              _tabController?.dispose();
+              _tabController =null;
             }
-            _tabController = TabController(
+            return prev != next;
+          },
+          builder: (_, state, __) {
+            _tabController ??= TabController(
               length: state.groupNames.length,
               vsync: this,
               initialIndex: state.currentIndex,
@@ -118,7 +121,6 @@ class _ProxiesFragmentState extends State<ProxiesFragment>
                     children: [
                       for (final groupName in state.groupNames)
                         KeepContainer(
-                          key: ObjectKey(groupName),
                           child: ProxiesTabView(
                             groupName: groupName,
                           ),

lib/state.dart

@@ -23,6 +23,7 @@ class GlobalState {
   List<Function> updateFunctionLists = [];
   List<NavigationItem> currentNavigationItems = [];
   bool updatePackagesLock = false;
+  bool healthcheckLock = false;
 
   startListenUpdate() {
     if (timer != null && timer!.isActive == true) return;

lib/widgets/clash_message_container.dart

@@ -38,12 +38,15 @@ class _ClashMessageContainerState extends State<ClashMessageContainer>
 
   @override
   void onDelay(Delay delay) {
-    context.appController.setDelay(delay);
+    final appController = context.appController;
+    appController.setDelay(delay);
+    globalState.healthcheckLock = true;
     WidgetsBinding.instance.addPostFrameCallback((_) {
       globalState.updateSortNumDebounce ??= debounce<Function()>(
-        () {
-          context.appController.updateGroups();
-          context.appController.appState.sortNum++;
+        () async {
+          await appController.updateGroups();
+          appController.appState.sortNum++;
+          globalState.healthcheckLock = false;
         },
         milliseconds: 5000,
       );