Code Quality: Bring back WinUIEx (#16227)

Author: 0x5bfa

src/Files.App/Files.App.csproj

@@ -85,6 +85,7 @@
         <PackageReference Include="CommunityToolkit.WinUI.UI.Controls" Version="7.1.2" />
         <PackageReference Include="TagLibSharp" Version="2.3.0" />
         <PackageReference Include="Tulpep.ActiveDirectoryObjectPicker" Version="3.0.11" />
+        <PackageReference Include="WinUIEx" Version="2.3.4" />
         <PackageReference Include="Vanara.Windows.Extensions" Version="4.0.1" />
         <PackageReference Include="Vanara.Windows.Shell" Version="4.0.1" />
         <PackageReference Include="Microsoft.Management.Infrastructure" Version="3.0.0" />

src/Files.App/MainWindow.xaml

@@ -1,9 +1,10 @@
 <!--  Copyright (c) 2024 Files Community. Licensed under the MIT License. See the LICENSE.  -->
-<items:WindowEx
+<winuiex:WindowEx
 	x:Class="Files.App.MainWindow"
 	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 	xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 	xmlns:items="using:Files.App.Data.Items"
 	xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	xmlns:winuiex="using:WinUIEx"
 	mc:Ignorable="d" />

src/Files.App/MainWindow.xaml.cs

@@ -13,15 +13,20 @@
 
 namespace Files.App
 {
-	public sealed partial class MainWindow : WindowEx
+	public sealed partial class MainWindow : WinUIEx.WindowEx
 	{
 		private static MainWindow? _Instance;
 		public static MainWindow Instance => _Instance ??= new();
 
-		public MainWindow() : base(minWidth: 516, minHeight: 416)
+		public nint WindowHandle { get; }
+
+		public MainWindow()
 		{
 			InitializeComponent();
 
+			WindowHandle = WinUIEx.WindowExtensions.GetWindowHandle(this);
+			MinHeight = 416;
+			MinWidth = 516;
 			ExtendsContentIntoTitleBar = true;
 			Title = "Files";
 			AppWindow.TitleBar.ButtonBackgroundColor = Colors.Transparent;
@@ -188,9 +193,8 @@ public async Task InitializeApplicationAsync(object activatedEventArgs)
 				Win32Helper.BringToForegroundEx(new(WindowHandle));
 			}
 
-			if (Windows.Win32.PInvoke.IsIconic(new(WindowHandle)) &&
-				AppWindow.Presenter is OverlappedPresenter presenter)
-				presenter.Restore(); // Restore window if minimized
+			if (Windows.Win32.PInvoke.IsIconic(new(WindowHandle)))
+				WinUIEx.WindowExtensions.Restore(Instance); // Restore window if minimized
 		}
 
 		private Frame? EnsureWindowIsInitialized()