chore: Align GTK with ContentIsland changes

src/Uno.UI.Runtime.Skia.Gtk/Extensions/UI/Xaml/Controls/NativeWindowFactoryExtension.cs

@@ -17,6 +17,6 @@ internal NativeWindowFactoryExtension()
 	public INativeWindowWrapper CreateWindow(Window window, XamlRoot xamlRoot)
 	{
 		var unoGtkWindow = new UnoGtkWindow(window, xamlRoot);
-		return new GtkWindowWrapper(unoGtkWindow);
+		return new GtkWindowWrapper(unoGtkWindow, xamlRoot);
 	}
 }

src/Uno.UI.Runtime.Skia.Gtk/UI/Controls/GtkWindowWrapper.cs

@@ -4,9 +4,11 @@
 using System.Collections.Generic;
 using Gtk;
 using Microsoft.UI.Windowing;
+using Microsoft.UI.Xaml;
 using Uno.Disposables;
 using Uno.Extensions.Specialized;
 using Uno.Foundation.Logging;
+using Uno.UI.Runtime.Skia.Gtk.Helpers.Dpi;
 using Uno.UI.Xaml.Controls;
 using Windows.Foundation;
 using Windows.UI.Core;
@@ -20,17 +22,22 @@ internal class GtkWindowWrapper : NativeWindowWrapperBase
 	private bool _wasShown;
 	private readonly UnoGtkWindow _gtkWindow;
 	private List<PendingWindowStateChangedInfo>? _pendingWindowStateChanged = new();
+	private DpiHelper _dpiHelper;
 
-	public GtkWindowWrapper(UnoGtkWindow gtkWindow)
+	public GtkWindowWrapper(UnoGtkWindow gtkWindow, XamlRoot xamlRoot) : base(xamlRoot)
 	{
 		_gtkWindow = gtkWindow ?? throw new ArgumentNullException(nameof(gtkWindow));
 		_gtkWindow.Shown += OnWindowShown;
 		_gtkWindow.Host.SizeChanged += OnHostSizeChanged;
 		_gtkWindow.DeleteEvent += OnWindowClosing;
 		_gtkWindow.Destroyed += OnWindowClosed;
 		_gtkWindow.WindowStateEvent += OnWindowStateChanged;
+		_dpiHelper = new DpiHelper(_gtkWindow);
+		_dpiHelper.DpiChanged += OnDpiChanged;
 	}
 
+	private void OnDpiChanged(object? sender, EventArgs e) => RasterizationScale = _dpiHelper.RasterizationScale;
+
 	public override string Title
 	{
 		get => _gtkWindow.Title;