Fix multi instance on windows

lib/features/window/notifier/window_notifier.dart

@@ -1,3 +1,4 @@
+import 'dart:io';
 import 'dart:ui';
 
 import 'package:hiddify/core/app_info/app_info_provider.dart';
@@ -7,6 +8,7 @@ import 'package:hiddify/utils/utils.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:tray_manager/tray_manager.dart';
 import 'package:window_manager/window_manager.dart';
+import 'package:windows_single_instance/windows_single_instance.dart';
 
 part 'window_notifier.g.dart';
 
@@ -19,6 +21,11 @@ class WindowNotifier extends _$WindowNotifier with AppLogger {
   Future<void> build() async {
     if (!PlatformUtils.isDesktop) return;
 
+    if (Platform.isWindows) {
+      loggy.debug("ensuring single instance");
+      await WindowsSingleInstance.ensureSingleInstance([], "app.hiddify.com");
+    }
+
     await windowManager.ensureInitialized();
     await windowManager.setMinimumSize(minimumWindowSize);
     await windowManager.setSize(defaultWindowSize);

pubspec.lock

@@ -1682,6 +1682,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.3.7"
+  windows_single_instance:
+    dependency: "direct main"
+    description:
+      name: windows_single_instance
+      sha256: "50d5dcd6bec90b4a5ed588b1822b1aad21b39fc96da843e61c734b3caccfd2fc"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
   xdg_directories:
     dependency: transitive
     description:

pubspec.yaml

@@ -71,6 +71,7 @@ dependencies:
   qr_flutter: ^4.1.0
   native_dio_adapter: ^1.2.0
   flutter_displaymode: ^0.6.0
+  windows_single_instance: ^1.0.1
 
 dev_dependencies:
   flutter_test:

windows/flutter/generated_plugin_registrant.cc

@@ -15,6 +15,7 @@
 #include <url_launcher_windows/url_launcher_windows.h>
 #include <vclibs/vclibs_plugin.h>
 #include <window_manager/window_manager_plugin.h>
+#include <windows_single_instance/windows_single_instance_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   ProtocolHandlerPluginRegisterWithRegistrar(
@@ -35,4 +36,6 @@ void RegisterPlugins(flutter::PluginRegistry* registry) {
       registry->GetRegistrarForPlugin("VclibsPlugin"));
   WindowManagerPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("WindowManagerPlugin"));
+  WindowsSingleInstancePluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("WindowsSingleInstancePlugin"));
 }

windows/flutter/generated_plugins.cmake

@@ -12,6 +12,7 @@ list(APPEND FLUTTER_PLUGIN_LIST
   url_launcher_windows
   vclibs
   window_manager
+  windows_single_instance
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST