feat: Improve UAC prompt handling by focusing the UAC window, useful …

…when UAC set as Do Not Dim.

Fixes #85

src/gsudo/Helpers/ServiceHelper.cs

@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Security;
 using System.Security.Principal;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace gsudo.Helpers
@@ -175,13 +176,21 @@ internal static SafeProcessHandle StartService(int? allowedPid, TimeSpan? cacheD
                 else
                 {
                     if (SecurityHelper.IsMemberOfLocalAdmins() && InputArguments.GetIntegrityLevel() >= IntegrityLevel.High)
+                    {
+                        // UAC Popup doesnt always have focus, so we try to bring it to the front.
+                        new Thread(UACWindowFocusHelper.FocusUacWindow).Start();
+
                         ret = ProcessFactory.StartElevatedDetached(ownExe, commandLine, !InputArguments.Debug).GetSafeProcessHandle();
+                    }
                     else
                         ret = ProcessFactory.StartDetached(ownExe, commandLine, null, !InputArguments.Debug).GetSafeProcessHandle();
                 }
             }
             else
             {
+                // UAC Popup doesnt always have focus, so we try to bring it to the front.
+                new Thread(UACWindowFocusHelper.FocusUacWindow).Start();
+
                 ret = ProcessFactory.StartElevatedDetached(ownExe, commandLine, !InputArguments.Debug).GetSafeProcessHandle();
             }
 

src/gsudo/Helpers/UACWindowFocusHelper.cs

@@ -0,0 +1,38 @@
+using gsudo.Native;
+using System;
+using System.Runtime.InteropServices;
+
+namespace gsudo.Helpers
+{
+    internal class UACWindowFocusHelper
+    {
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
+
+        internal static void FocusUacWindow()
+        {
+            try
+            {
+                for (int i = 0; i < 10; i++)
+                {
+                    // Wait a moment to allow the UAC prompt to appear
+                    System.Threading.Thread.Sleep(100);
+
+                    // Find the UAC window
+                    string classname = "Credential Dialog Xaml Host"; // Found using Visual Studio spyxx_amd64.exe, this is the value for Windows 10 & 11.
+                    IntPtr uacWindow = FindWindow(classname, null);
+                    if (uacWindow != IntPtr.Zero)
+                    {
+                        // Set focus to the UAC window
+                        WindowApi.SetForegroundWindow(uacWindow);
+                        return;
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger.Instance.Log("Error searching for UAC Window: " + ex.ToString(), LogLevel.Debug);
+            }
+        }
+    }
+}