fix: allowing idle scroll events

flutter/lib/common.dart

@@ -1735,6 +1735,7 @@ Future<void> updateSystemWindowTheme() async {
     }
   }
 }
+
 /// macOS only
 ///
 /// Note: not found a general solution for rust based AVFoundation bingding.
@@ -1762,3 +1763,27 @@ Future<PermissionAuthorizeType> osxCanRecordAudio() async {
 Future<bool> osxRequestAudio() async {
   return await kMacOSPermChannel.invokeMethod("requestRecordAudio");
 }
+
+class DraggableNeverScrollableScrollPhysics extends ScrollPhysics {
+  /// Creates scroll physics that does not let the user scroll.
+  const DraggableNeverScrollableScrollPhysics({super.parent});
+
+  @override
+  DraggableNeverScrollableScrollPhysics applyTo(ScrollPhysics? ancestor) {
+    return DraggableNeverScrollableScrollPhysics(parent: buildParent(ancestor));
+  }
+
+  @override
+  bool shouldAcceptUserOffset(ScrollMetrics position) {
+    // TODO: find a better solution to check if the offset change is caused by the scrollbar.
+    // Workaround: when dragging with the scrollbar, it always triggers an [IdleScrollActivity].
+    if (position is ScrollPositionWithSingleContext) {
+      // ignore: invalid_use_of_protected_member, invalid_use_of_visible_for_testing_member
+      return position.activity is IdleScrollActivity;
+    }
+    return false;
+  }
+
+  @override
+  bool get allowImplicitScrolling => false;
+}

flutter/lib/desktop/pages/connection_page.dart

@@ -120,7 +120,7 @@ class _ConnectionPageState extends State<ConnectionPage>
             scrollController: _scrollController,
             child: CustomScrollView(
               controller: _scrollController,
-              physics: NeverScrollableScrollPhysics(),
+              physics: DraggableNeverScrollableScrollPhysics(),
               slivers: [
                 SliverList(
                     delegate: SliverChildListDelegate([

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -75,6 +75,7 @@ class _DesktopHomePageState extends State<DesktopHomePage>
           scrollController: _leftPaneScrollController,
           child: SingleChildScrollView(
             controller: _leftPaneScrollController,
+            physics: DraggableNeverScrollableScrollPhysics(),
             child: Column(
               children: [
                 buildTip(context),

flutter/lib/desktop/pages/desktop_setting_page.dart

@@ -128,7 +128,7 @@ class _DesktopSettingPageState extends State<DesktopSettingPage>
                   scrollController: controller,
                   child: PageView(
                     controller: controller,
-                    physics: NeverScrollableScrollPhysics(),
+                    physics: DraggableNeverScrollableScrollPhysics(),
                     children: const [
                       _General(),
                       _Safety(),
@@ -170,7 +170,7 @@ class _DesktopSettingPageState extends State<DesktopSettingPage>
     return DesktopScrollWrapper(
         scrollController: scrollController,
         child: ListView(
-          physics: NeverScrollableScrollPhysics(),
+          physics: DraggableNeverScrollableScrollPhysics(),
           controller: scrollController,
           children: tabs
               .asMap()
@@ -234,7 +234,7 @@ class _GeneralState extends State<_General> {
     return DesktopScrollWrapper(
         scrollController: scrollController,
         child: ListView(
-          physics: NeverScrollableScrollPhysics(),
+          physics: DraggableNeverScrollableScrollPhysics(),
           controller: scrollController,
           children: [
             theme(),
@@ -456,7 +456,7 @@ class _SafetyState extends State<_Safety> with AutomaticKeepAliveClientMixin {
     return DesktopScrollWrapper(
         scrollController: scrollController,
         child: SingleChildScrollView(
-            physics: NeverScrollableScrollPhysics(),
+            physics: DraggableNeverScrollableScrollPhysics(),
             controller: scrollController,
             child: Column(
               children: [
@@ -908,7 +908,7 @@ class _NetworkState extends State<_Network> with AutomaticKeepAliveClientMixin {
         scrollController: scrollController,
         child: ListView(
             controller: scrollController,
-            physics: NeverScrollableScrollPhysics(),
+            physics: DraggableNeverScrollableScrollPhysics(),
             children: [
               _lock(locked, 'Unlock Network Settings', () {
                 locked = false;
@@ -1094,7 +1094,7 @@ class _DisplayState extends State<_Display> {
         scrollController: scrollController,
         child: ListView(
             controller: scrollController,
-            physics: NeverScrollableScrollPhysics(),
+            physics: DraggableNeverScrollableScrollPhysics(),
             children: [
               viewStyle(context),
               scrollStyle(context),
@@ -1334,7 +1334,7 @@ class _AccountState extends State<_Account> {
     return DesktopScrollWrapper(
         scrollController: scrollController,
         child: ListView(
-          physics: NeverScrollableScrollPhysics(),
+          physics: DraggableNeverScrollableScrollPhysics(),
           controller: scrollController,
           children: [
             _Card(title: 'Account', children: [accountAction()]),
@@ -1378,7 +1378,7 @@ class _AboutState extends State<_About> {
           scrollController: scrollController,
           child: SingleChildScrollView(
             controller: scrollController,
-            physics: NeverScrollableScrollPhysics(),
+            physics: DraggableNeverScrollableScrollPhysics(),
             child: _Card(title: '${translate('About')} RustDesk', children: [
               Column(
                 crossAxisAlignment: CrossAxisAlignment.start,