Fixed matrix multiplication order

src/Avalonia.Base/Rendering/Composition/Server/DrawingContextProxy.cs

@@ -33,7 +33,7 @@ internal class CompositorDrawingContextProxy : IDrawingContextImpl, IDrawingCont
         set => _visualBrushRenderer.VisualBrushDrawList = value;
     }
     
-    public Matrix PreTransform { get; set; } = Matrix.Identity;
+    public Matrix PostTransform { get; set; } = Matrix.Identity;
     
     public void Dispose()
     {
@@ -44,7 +44,7 @@ internal class CompositorDrawingContextProxy : IDrawingContextImpl, IDrawingCont
     public Matrix Transform
     {
         get => _transform;
-        set => _impl.Transform = PreTransform * (_transform = value);
+        set => _impl.Transform = (_transform = value) * PostTransform;
     }
 
     public void Clear(Color color)

src/Avalonia.Base/Rendering/Composition/Server/ServerVisual.cs

@@ -41,7 +41,7 @@ namespace Avalonia.Rendering.Composition.Server
             Root!.RenderedVisuals++;
             
             var transform = GlobalTransformMatrix;
-            canvas.PreTransform = MatrixUtils.ToMatrix(transform);
+            canvas.PostTransform = MatrixUtils.ToMatrix(transform);
             canvas.Transform = Matrix.Identity;
             if (Opacity != 1)
                 canvas.PushOpacity(Opacity);
@@ -56,7 +56,7 @@ namespace Avalonia.Rendering.Composition.Server
             RenderCore(canvas, currentTransformedClip);
             
             // Hack to force invalidation of SKMatrix
-            canvas.PreTransform = MatrixUtils.ToMatrix(transform);
+            canvas.PostTransform = MatrixUtils.ToMatrix(transform);
             canvas.Transform = Matrix.Identity;
 
             if (OpacityMaskBrush != null)