Window position shifts when size changes with taskbar on left or top

[kirb]

Describe the bug

When the user has moved their Windows taskbar from the default position at the bottom to the left or top, Avalonia windows that use SizeToContent="Width/Height/WidthAndHeight" and CanResize="False", and then experience a change in width or height, shift down or across the screen significantly. The shift appears to equal the width of the taskbar if on the left, or height if on top.

To Reproduce

Test case: AvaloniaCarouselShiftBug.zip

Reproducible on Windows 10, and Windows 11 with ExplorerPatcher or StartAllBack. Not able to reproduce on macOS 14.5 or 15.0b2 (with the dock or menu bar).

1. Build and run the test case
2. With taskbar at the bottom, click "Height++". Observe no position change.
3. Move taskbar to left, click "Height++". Observe window shifts to the right.
4. Move taskbar to top, click "Height++". Observe window shifts down.
5. In AvaloniaCarouselShiftBug.csproj, change AvaloniaVersion to 11.0.11, restore NuGet packages, and then repeat the above steps. Observe no position changes.

Expected behavior

Behavior observed on 11.0.11 - window position remains intact.

Avalonia version

First appeared in 11.1.0-beta1; still in 11.1.0-rc2

OS

Windows

Additional context

No response

[TomEdwardsEnscape]

Probably caused by #14470.