chore: Win32 adjustments

Author: MartinZikmund

src/Uno.UI.Runtime.Skia.MacOS/UI/Xaml/Window/MacOSWindowHost.cs

@@ -219,7 +219,7 @@ void IXamlRootHost.InvalidateRender()
 		var (picture, path) = SkiaRenderHelper.RecordPictureAndReturnPath(
 			(int)_nativeWindowSize.Width,
 			(int)_nativeWindowSize.Height,
-			rootElement.Visual,
+			rootElement,
 			invertPath: false);
 
 		Interlocked.Exchange(ref _picture, picture);

src/Uno.UI.Runtime.Skia.Win32/UI/Xaml/Window/Win32WindowWrapper.cs

@@ -58,8 +58,8 @@ internal partial class Win32WindowWrapper : NativeWindowWrapperBase, IXamlRootHo
 	private SKColor _background;
 	private bool _isFirstEraseBkgnd = true;
 
-	private SKPicture _picture;
-	private SKPath _clipPath;
+	private SKPicture? _picture;
+	private SKPath? _clipPath;
 
 	static unsafe Win32WindowWrapper()
 	{

src/Uno.UI.Runtime.Skia.Wpf/Hosting/IWpfXamlRootHost.cs

@@ -14,7 +14,7 @@ internal interface IWpfXamlRootHost : IXamlRootHost
 
 	RenderSurfaceType? RenderSurfaceType { get; }
 
-	SKPicture? Picture { get; set; }
+	SKPicture? Picture { get; }
 
-	SKPath? ClipPath { get; set; }
+	SKPath? ClipPath { get; }
 }

src/Uno.UI.Runtime.Skia.Wpf/UI/Xaml/Window/UnoWpfWindowHost.cs

@@ -63,8 +63,8 @@ internal class UnoWpfWindowHost : WpfControl, IWpfWindowHost
 
 	private readonly SerialDisposable _backgroundDisposable = new();
 
-	private SKPicture _picture;
-	private SKPath _clipPath;
+	private SKPicture? _picture;
+	private SKPath? _clipPath;
 
 	public UnoWpfWindowHost(UnoWpfWindow wpfWindow, MUX.Window winUIWindow)
 	{
@@ -94,8 +94,8 @@ public UnoWpfWindowHost(UnoWpfWindow wpfWindow, MUX.Window winUIWindow)
 	public WpfControl RenderLayer => _renderLayer;
 	public WpfControl BottomLayer => _renderLayer;
 
-	public SKPicture Picture => _picture;
-	public SKPath ClipPath => _clipPath;
+	SKPicture? IWpfXamlRootHost.Picture => _picture;
+	SKPath? IWpfXamlRootHost.ClipPath => _clipPath;
 
 	internal void InitializeRenderer()
 	{

src/Uno.UI/Helpers/SkiaRenderHelper.skia.cs

@@ -16,9 +16,9 @@ namespace Uno.UI.Helpers;
 internal static class SkiaRenderHelper
 {
 	internal static bool CanRecordPicture([NotNullWhen(true)] UIElement? rootElement) =>
-		rootElement is null ||
-		rootElement.IsArrangeDirtyOrArrangeDirtyPath ||
-		rootElement.IsMeasureDirtyOrMeasureDirtyPath;
+		rootElement is not null &&
+		!rootElement.IsArrangeDirtyOrArrangeDirtyPath &&
+		!rootElement.IsMeasureDirtyOrMeasureDirtyPath;
 
 	internal static (SKPicture, SKPath) RecordPictureAndReturnPath(int width, int height, UIElement rootElement, bool invertPath)
 	{