cm add multi clients scroll controller arrow actions

flutter/lib/desktop/pages/server_page.dart

@@ -125,6 +125,7 @@ class ConnectionManagerState extends State<ConnectionManager> {
             showClose: true,
             controller: serverModel.tabController,
             maxLabelWidth: 100,
+            tail: buildScrollJumper(),
             pageViewBuilder: (pageView) => Row(children: [
                   Expanded(child: pageView),
                   Consumer<ChatModel>(
@@ -159,6 +160,21 @@ class ConnectionManagerState extends State<ConnectionManager> {
       ),
     );
   }
+
+  Widget buildScrollJumper() {
+    final offstage = gFFI.serverModel.clients.length < 2;
+    final sc = gFFI.serverModel.tabController.state.value.scrollController;
+    return Offstage(
+        offstage: offstage,
+        child: Row(
+          children: [
+            ActionIcon(
+                icon: Icons.arrow_left, iconSize: 22, onTap: sc.backward),
+            ActionIcon(
+                icon: Icons.arrow_right, iconSize: 22, onTap: sc.forward),
+          ],
+        ));
+  }
 }
 
 Widget buildConnectionCard(Client client) {

flutter/lib/desktop/widgets/tabbar_widget.dart

@@ -844,7 +844,7 @@ class _CloseButton extends StatelessWidget {
 }
 
 class ActionIcon extends StatelessWidget {
-  final String message;
+  final String? message;
   final IconData icon;
   final Function() onTap;
   final bool isClose;
@@ -852,7 +852,7 @@ class ActionIcon extends StatelessWidget {
   final double boxSize;
   const ActionIcon(
       {Key? key,
-      required this.message,
+      this.message,
       required this.icon,
       required this.onTap,
       this.isClose = false,
@@ -864,7 +864,7 @@ class ActionIcon extends StatelessWidget {
   Widget build(BuildContext context) {
     RxBool hover = false.obs;
     return Obx(() => Tooltip(
-          message: translate(message),
+          message: message != null ? translate(message!) : "",
           waitDuration: const Duration(seconds: 1),
           child: InkWell(
             hoverColor: isClose