Drag/Dropping Window to Maximized Cuts Taskbar (BorderOnly Deco)

Discussed in https://github.com/AvaloniaUI/Avalonia/discussions/11222

<div type='discussions-op-text'>

^{Originally posted by ArchLeaders May 3, 2023} I’m setting up a custom window chrome for my application, but I’m getting some weird behavior with the drag/drop to fullscreen action in Windows 10.

Setting WindowState to WindowState.Maximized works just fine, but when I drag the window to the top of the screen and drop it cuts out the task bar and about 7 pixels off the side of the window.

https://user-images.githubusercontent.com/80713508/236018412-8c7b7983-62ab-4fbd-b272-6aa63c661e9d.mp4

Is there a way to intercept this behavior and call whatever Avalonia does to fullscreen to the correct bounds instead? Or just another way to fix this?

• Avalonia Version: 11.0.0-preview6 and 11.0.0-r1.1
• OS: Windows 10</div>

[timunie]

Window has a property called OffScreenMargin. Can you try to apply this to your inner Content?

<Window xmlns="https://github.com/avaloniaui"
        ... other namespaces etc ... >
   <Grid Margin="{Binding $parent[Window].OffScreenMargin}">
     ... Content ...
   </Grid>
</Window>

[ApaulMyLittleAirport]

Margin="{Binding $parent[Window].OffScreenMargin} ，This one really works, thank you!!