chore: 提取UntilIdleAsync函数

src/MaaWpfGui/States/RunningState.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 
 namespace MaaWpfGui.States
 {
@@ -48,5 +49,13 @@ namespace MaaWpfGui.States
         {
             IdleChanged?.Invoke(this, newIdleValue);
         }
+
+        public async Task UntilIdleAsync(int time = 1000)
+        {
+            while (!GetIdle())
+            {
+                await Task.Delay(time);
+            }
+        }
     }
 }

src/MaaWpfGui/ViewModels/UI/VersionUpdateViewModel.cs

@@ -585,22 +585,16 @@ namespace MaaWpfGui.ViewModels.UI
             return checkResult;
         }
 
-        public void AskToRestart()
+        public async void AskToRestart()
         {
             if (Instances.SettingsViewModel.AutoInstallUpdatePackage)
             {
-                _ = Task.Run(async () =>
-                {
-                    while (!runningState.GetIdle())
-                    {
-                        await Task.Delay(60000);
-                    }
+                await runningState.UntilIdleAsync(60000);
 
-                    Application.Current.Dispatcher.Invoke(() =>
-                    {
-                        Application.Current.Shutdown();
-                        Bootstrapper.RestartApplication();
-                    });
+                Application.Current.Dispatcher.Invoke(() =>
+                {
+                    Application.Current.Shutdown();
+                    Bootstrapper.RestartApplication();
                 });
                 return;
             }