Fix restart as administrator issue

Author: Jack251970

Flow.Launcher/SettingPages/ViewModels/SettingsPaneGeneralViewModel.cs

@@ -1,7 +1,10 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO;
 using System.Linq;
+using System.Reflection;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Forms;
@@ -168,19 +171,43 @@ private async Task CheckAdminChangeAndAskForRestartAsync()
                 await ImageLoader.WaitSaveAsync();
 
                 // Restart the app as administrator
-                var startInfo = new ProcessStartInfo
-                {
-                    UseShellExecute = true,
-                    WorkingDirectory = Environment.CurrentDirectory,
-                    FileName = Constant.ExecutablePath,
-                    Verb = "runas"
-                };
-                Process.Start(startInfo);
-                Environment.Exit(0);
+                RestartAppAsAdministrator(Constant.ExecutablePath);
             }
         }  
     }
 
+    private static void RestartAppAsAdministrator(string exeToStart)
+    {
+        var startInfo = new ProcessStartInfo
+        {
+            FileName = getUpdateExe(),
+            Arguments = $"--processStartAndWait {exeToStart}",
+            UseShellExecute = true,
+            Verb = "runas",
+        };
+        Process.Start(startInfo);
+        Thread.Sleep(500);
+        Environment.Exit(0);
+    }
+
+    private static string getUpdateExe()
+    {
+        Assembly entryAssembly = Assembly.GetEntryAssembly();
+        if (entryAssembly != null && Path.GetFileName(entryAssembly.Location).Equals("update.exe", StringComparison.OrdinalIgnoreCase) && entryAssembly.Location.IndexOf("app-", StringComparison.OrdinalIgnoreCase) == -1 && entryAssembly.Location.IndexOf("SquirrelTemp", StringComparison.OrdinalIgnoreCase) == -1)
+        {
+            return Path.GetFullPath(entryAssembly.Location);
+        }
+
+        entryAssembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
+        FileInfo fileInfo = new FileInfo(Path.Combine(Path.GetDirectoryName(entryAssembly.Location), "..\\Update.exe"));
+        if (!fileInfo.Exists)
+        {
+            throw new Exception("Update.exe not found, not a Squirrel-installed app?");
+        }
+
+        return fileInfo.FullName;
+    }
+
     public List<SearchWindowScreenData> SearchWindowScreens { get; } =
         DropdownDataGeneric<SearchWindowScreens>.GetValues<SearchWindowScreenData>("SearchWindowScreen");