dropdown menu for tabs that cannot be displayed (#7918)

* The visibility threshold is 75%
* Used in remote, file transfer, port forward and cm

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/desktop/pages/file_manager_tab_page.dart

@@ -99,7 +99,7 @@ class _FileManagerTabPageState extends State<FileManagerTabPage> {
           body: DesktopTab(
             controller: tabController,
             onWindowCloseButton: handleWindowCloseButton,
-            tail: const AddButton().paddingOnly(left: 10),
+            tail: const AddButton(),
             labelGetter: DesktopTab.tablabelGetter,
           )),
     );

flutter/lib/desktop/pages/port_forward_tab_page.dart

@@ -108,7 +108,7 @@ class _PortForwardTabPageState extends State<PortForwardTabPage> {
               tabController.clear();
               return true;
             },
-            tail: AddButton().paddingOnly(left: 10),
+            tail: AddButton(),
             labelGetter: DesktopTab.tablabelGetter,
           )),
     );

flutter/lib/desktop/pages/remote_tab_page.dart

@@ -143,7 +143,7 @@ class _ConnectionTabPageState extends State<ConnectionTabPage> {
           body: DesktopTab(
             controller: tabController,
             onWindowCloseButton: handleWindowCloseButton,
-            tail: const AddButton().paddingOnly(left: 10),
+            tail: const AddButton(),
             pageViewBuilder: (pageView) => pageView,
             labelGetter: DesktopTab.tablabelGetter,
             tabBuilder: (key, icon, label, themeConf) => Obx(() {

flutter/lib/desktop/pages/server_page.dart

@@ -157,7 +157,7 @@ class ConnectionManagerState extends State<ConnectionManager> {
               controller: serverModel.tabController,
               selectedBorderColor: MyTheme.accent,
               maxLabelWidth: 100,
-              tail: buildScrollJumper(),
+              tail: null, //buildScrollJumper(),
               selectedTabBackgroundColor:
                   Theme.of(context).hintColor.withOpacity(0),
               tabBuilder: (key, icon, label, themeConf) {