fix https://github.com/rustdesk/rustdesk/issues/2680

flutter/lib/common.dart

@@ -2674,23 +2674,34 @@ Future<void> start_service(bool is_start) async {
   }
 }
 
+Future<bool> canBeBlocked() async {
+  var access_mode = await bind.mainGetOption(key: kOptionAccessMode);
+  var option = option2bool(kOptionAllowRemoteConfigModification,
+      await bind.mainGetOption(key: kOptionAllowRemoteConfigModification));
+  return access_mode == 'view' || (access_mode.isEmpty && !option);
+}
+
+Future<void> shouldBeBlocked(RxBool block, WhetherUseRemoteBlock? use) async {
+  if (use != null && !await use()) {
+    block.value = false;
+    return;
+  }
+  var time0 = DateTime.now().millisecondsSinceEpoch;
+  await bind.mainCheckMouseTime();
+  Timer(const Duration(milliseconds: 120), () async {
+    var d = time0 - await bind.mainGetMouseTime();
+    if (d < 120) {
+      block.value = true;
+    }
+  });
+}
+
 typedef WhetherUseRemoteBlock = Future<bool> Function();
 Widget buildRemoteBlock({required Widget child, WhetherUseRemoteBlock? use}) {
   var block = false.obs;
   return Obx(() => MouseRegion(
         onEnter: (_) async {
-          if (use != null && !await use()) {
+          await shouldBeBlocked(block, use);
-            block.value = false;
-            return;
-          }
-          var time0 = DateTime.now().millisecondsSinceEpoch;
-          await bind.mainCheckMouseTime();
-          Timer(const Duration(milliseconds: 120), () async {
-            var d = time0 - await bind.mainGetMouseTime();
-            if (d < 120) {
-              block.value = true;
-            }
-          });
         },
         onExit: (event) => block.value = false,
         child: Stack(children: [

flutter/lib/desktop/pages/desktop_tab_page.dart

@@ -36,12 +36,24 @@ class DesktopTabPage extends StatefulWidget {
   }
 }
 
-class _DesktopTabPageState extends State<DesktopTabPage> {
+class _DesktopTabPageState extends State<DesktopTabPage>
+    with WidgetsBindingObserver {
   final tabController = DesktopTabController(tabType: DesktopTabType.main);
 
+  final RxBool _block = false.obs;
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    super.didChangeAppLifecycleState(state);
+    if (state == AppLifecycleState.resumed) {
+      shouldBeBlocked(_block, canBeBlocked);
+    } else if (state == AppLifecycleState.inactive) {}
+  }
+
   @override
   void initState() {
     super.initState();
+    WidgetsBinding.instance.addObserver(this);
     Get.put<DesktopTabController>(tabController);
     RemoteCountState.init();
     tabController.add(TabInfo(
@@ -68,8 +80,10 @@ class _DesktopTabPageState extends State<DesktopTabPage> {
 
   @override
   void dispose() {
-    super.dispose();
+    WidgetsBinding.instance.removeObserver(this);
     Get.delete<DesktopTabController>();
+
+    super.dispose();
   }
 
   @override
@@ -89,12 +103,17 @@ class _DesktopTabPageState extends State<DesktopTabPage> {
                 ),
               ),
             )));
+    widget() => MouseRegion(
+        onEnter: (_) async {
+          await shouldBeBlocked(_block, canBeBlocked);
+        },
+        child: FocusScope(child: tabWidget, canRequestFocus: !_block.value));
     return isMacOS || kUseCompatibleUiMode
-        ? tabWidget
+        ? Obx(() => widget())
         : Obx(
             () => DragToResizeArea(
               resizeEdgeSize: stateGlobal.resizeEdgeSize.value,
-              child: tabWidget,
+              child: widget(),
             ),
           );
   }

flutter/lib/desktop/widgets/tabbar_widget.dart

@@ -320,16 +320,7 @@ class DesktopTab extends StatelessWidget {
     if (tabType != DesktopTabType.main) {
       return child;
     }
-    return buildRemoteBlock(
+    return buildRemoteBlock(child: child, use: canBeBlocked);
-        child: child,
-        use: () async {
-          var access_mode = await bind.mainGetOption(key: kOptionAccessMode);
-          var option = option2bool(
-              kOptionAllowRemoteConfigModification,
-              await bind.mainGetOption(
-                  key: kOptionAllowRemoteConfigModification));
-          return access_mode == 'view' || (access_mode.isEmpty && !option);
-        });
   }
 
   List<Widget> _tabWidgets = [];