Window RenderTransform causes wrong content presentation

[metaone01]

Describe the bug

When RenderTransform specified rotate, its content will become relative and other parts became fully transparent (even if ExtendClientAreaToDecorationsHint="True" ExtendClientAreaChromeHints="NoChrome" ExtendClientAreaTitleBarHeightHint="-1" SystemDecorations="None"are NOT SET)
The white block is the window background, belongs to the window, and remains are not.

To Reproduce

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="Test.MainWindow"
        Title="Test"
        Width="200"
        Height="800"
        RenderTransform="Rotate(90deg)">
    <Border>
        <TextBlock Text="TestRotatedWindow" />
    </Border>
</Window>

Expected behavior

No response

Avalonia version

11.3.0-beta2

OS

Windows

Additional context

I know it is not a good idea to rotate the window. But it actually causes a wrong render and may cause some unintended security problems, like screenshots, like a larger than screen window to capture keyboard and mouse inputs.

[timunie]

You may want to use LayoutTransform instead. Also I'm not sure a Window can even be turned, but it's content for sure. We may need to raise an Exception if anyone tries to do so.

[metaone01]

Yeah, after read some documentations, I understand the difference between LayoutTransform and RenderTransform. I think maybe none of the OSs implemented rotating a window because no one needs it.

And just curious, is that actually a correct render or it does wrong?

[metaone01]

@timunie Should we close this issue as completed?

[timunie]

I agree we can close this issue.