fix: set edge size to zero when in fullscreen mode

flutter/lib/desktop/pages/connection_page.dart

@@ -8,6 +8,7 @@ import 'package:auto_size_text/auto_size_text.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hbb/consts.dart';
 import 'package:flutter_hbb/desktop/widgets/scroll_wrapper.dart';
+import 'package:flutter_hbb/models/state_model.dart';
 import 'package:get/get.dart';
 import 'package:url_launcher/url_launcher_string.dart';
 import 'package:window_manager/window_manager.dart';
@@ -92,6 +93,18 @@ class _ConnectionPageState extends State<ConnectionPage>
     }
   }
 
+  @override
+  void onWindowEnterFullScreen() {
+    // Remove edge border by setting the value to zero.
+    stateGlobal.resizeEdgeSize.value = 0;
+  }
+
+  @override
+  void onWindowLeaveFullScreen() {
+    // Restore edge border to default edge size.
+    stateGlobal.resizeEdgeSize.value = kWindowEdgeSize;
+  }
+
   @override
   void onWindowClose() {
     super.onWindowClose();

flutter/lib/desktop/pages/remote_tab_page.dart

@@ -38,8 +38,9 @@ class ConnectionTabPage extends StatefulWidget {
 }
 
 class _ConnectionTabPageState extends State<ConnectionTabPage> {
-  final tabController = Get.put(DesktopTabController(
-      tabType: DesktopTabType.remoteScreen));
+  final tabController =
+      Get.put(DesktopTabController(tabType: DesktopTabType.remoteScreen));
+  final contentKey = UniqueKey();
   static const IconData selectedIcon = Icons.desktop_windows_sharp;
   static const IconData unselectedIcon = Icons.desktop_windows_outlined;
 
@@ -80,7 +81,6 @@ class _ConnectionTabPageState extends State<ConnectionTabPage> {
     super.initState();
 
     tabController.onRemoved = (_, id) => onRemoveId(id);
-   
 
     rustDeskWinManager.setMethodHandler((call, fromWindowId) async {
       print(
@@ -197,11 +197,12 @@ class _ConnectionTabPageState extends State<ConnectionTabPage> {
     );
     return Platform.isMacOS
         ? tabWidget
-        : SubWindowDragToResizeArea(
-            child: tabWidget,
-            resizeEdgeSize: stateGlobal.resizeEdgeSize.value,
-            windowId: stateGlobal.windowId,
-          );
+        : Obx(() => SubWindowDragToResizeArea(
+              key: contentKey,
+              child: tabWidget,
+              resizeEdgeSize: stateGlobal.resizeEdgeSize.value,
+              windowId: stateGlobal.windowId,
+            ));
   }
 
   // Note: Some dup code to ../widgets/remote_menubar