ZIndex changes at runtime do not trigger redraw

[maxkatz6]

Describe the bug

Reported on the Telegram RU channel:

Changing ZIndex at runtime does not cause controls to redraw. The visual order only updates after a window resize.

To Reproduce

	<Canvas>
		<DockPanel x:Name="p1" Canvas.Left="100" Canvas.Top="100" ZIndex="2">
			<Rectangle Width="100" Height="100" Fill="Red"/>
		</DockPanel>
		
		<DockPanel x:Name="p2" Canvas.Left="150" Canvas.Top="150" ZIndex="1">
			<Rectangle Width="100" Height="100" Fill="Blue"/>
		</DockPanel>
	</Canvas>

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        p1.PointerPressed += (s, a) =>
        {
            p1.ZIndex = 2;
            p2.ZIndex = 1;
            InvalidateVisual();
        };

        p2.PointerPressed += (s, a) =>
        {
            p1.ZIndex = 1;
            p2.ZIndex = 2;
            InvalidateVisual();
        };
    }
}

Pressing on the DockPanel doesn't change zindex visually, until window is resized. InvalidateVisual doesn't invalidate zindex either.

Expected behavior

No response

Avalonia version

12.0.1

OS

Windows

Additional context

GetStartedApp.zip