feat: windows, custom client, update (#13687)

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/common.dart

@@ -3938,7 +3938,9 @@ void earlyAssert() {
 
 void checkUpdate() {
   if (!isWeb) {
-    if (!bind.isCustomClient()) {
+    final isWindowsInstalled = isWindows && bind.mainIsInstalled();
+    final shouldCheckUpdate = isWindowsInstalled || !bind.isCustomClient();
+    if (shouldCheckUpdate) {
       platformFFI.registerEventHandler(
           kCheckSoftwareUpdateFinish, kCheckSoftwareUpdateFinish,
           (Map<String, dynamic> evt) async {

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -430,10 +430,12 @@ class _DesktopHomePageState extends State<DesktopHomePage>
   }
 
   Widget buildHelpCards(String updateUrl) {
-    if (!bind.isCustomClient() &&
-        updateUrl.isNotEmpty &&
+    final isWindowsInstalled = isWindows && bind.mainIsInstalled();
+    if (updateUrl.isNotEmpty &&
         !isCardClosed &&
-        bind.mainUriPrefixSync().contains('rustdesk')) {
+        (isWindowsInstalled ||
+            (!bind.isCustomClient() &&
+                bind.mainUriPrefixSync().contains('rustdesk')))) {
       final isToUpdate = (isWindows || isMacOS) && bind.mainIsInstalled();
       String btnText = isToUpdate ? 'Update' : 'Download';
       GestureTapCallback onPressed = () async {

flutter/lib/desktop/pages/desktop_setting_page.dart

@@ -473,8 +473,7 @@ class _GeneralState extends State<_General> {
   }
 
   Widget other() {
-    final showAutoUpdate =
-        isWindows && bind.mainIsInstalled() && !bind.isCustomClient();
+    final showAutoUpdate = isWindows && bind.mainIsInstalled();
     final children = <Widget>[
       if (!isWeb && !bind.isIncomingOnly())
         _OptionCheckBox(context, 'Confirm before closing multiple tabs',