Translate TextNode bounds by offset.

The bounds of `TextNode` must include the offset passed to the constructor.

src/Avalonia.Visuals/Rendering/SceneGraph/TextNode.cs

@@ -27,7 +27,7 @@ namespace Avalonia.Rendering.SceneGraph
             Point origin,
             IFormattedTextImpl text,
             IDictionary<IVisual, Scene> childScenes = null)
-            : base(text.Bounds, transform, null)
+            : base(text.Bounds.Translate(origin), transform, null)
         {
             Transform = transform;
             Foreground = foreground?.ToImmutable();