[Peek]Delayed activation of the Peek window (#27444)

src/modules/peek/Peek.UI/App.xaml.cs

@@ -11,7 +11,6 @@ using Microsoft.UI.Xaml;
 using Peek.FilePreviewer;
 using Peek.UI.Telemetry.Events;
 using Peek.UI.Views;
-using WinUIEx;
 
 namespace Peek.UI
 {
@@ -95,9 +94,6 @@ namespace Peek.UI
             }
 
             Window = new MainWindow();
-
-            Window.Activate();
-            Window.Hide();
         }
 
         private void App_UnhandledException(object sender, Microsoft.UI.Xaml.UnhandledExceptionEventArgs e)

src/modules/peek/Peek.UI/MainWindow.xaml.cs

@@ -28,6 +28,7 @@ namespace Peek.UI
         public MainWindowViewModel ViewModel { get; }
 
         private ThemeListener? themeListener;
+        private bool activated;
 
         public MainWindow()
         {
@@ -84,6 +85,15 @@ namespace Peek.UI
         /// </summary>
         private void OnPeekHotkey()
         {
+            // First Peek activation
+            if (!activated)
+            {
+                Activate();
+                Initialize();
+                activated = true;
+                return;
+            }
+
             if (AppWindow.IsVisible)
             {
                 if (IsNewSingleSelectedItem())