Merge pull request #9487 from AvaloniaUI/fixes/recalculate-children-for-parent-on-attachment

Recalculate parent's child render nodes on visual tree attachment

src/Avalonia.Base/Visual.cs

@@ -417,6 +417,7 @@ namespace Avalonia
             OnAttachedToVisualTree(e);
             AttachedToVisualTree?.Invoke(this, e);
             InvalidateVisual();
+            _visualRoot.Renderer?.RecalculateChildren(_visualParent!);
 
             if (ZIndex != 0 && VisualParent is Visual parent)
                 parent.HasNonUniformZIndexChildren = true;