Exception: 'Infinite layout loop detected' when using SharedSizeGroup

[jpmikkers]

Describe the bug

In a ListBox where the ItemTemplate has a Grid containing a SharedSizeGroup (the ListBox itself has IsSharedSizeScope=true), after filling the list with random sized items, resizing the window or scrolling results in a 'Infinite layout loop detected' crash (fails about 50% of the time)

To Reproduce

• Compile and run the following project on Windows 11.
• Press fill list button
• now start resizing the window in a counterclockwise circular motion, or scroll the list content randomly
• now you'll see debug messages like [Layout]Layout cycle detected. Item 'Avalonia.Controls.Grid' was enqueued '10' times.
• eventually it will result in a System.InvalidOperationException: 'Infinite layout loop detected'

layoutlooprepro.zip

repro also available here: https://github.com/jpmikkers/AvaHash/tree/crashrepro

Expected behavior

No crash. Note that Avalonia 11.0.x did not show this issue.

Avalonia version

11.1.0, 11.1.1, 11.1.2, 11.1.3, 11.2.999-cibuild0051600-alpha

OS

Windows, Linux (raspbian on rpi4)

Additional context

https://github.com/user-attachments/assets/a9b840d4-db01-4909-9a58-1474538765a3

[Dmitrii-a11]

Avalonia 11.0.11 also throws the exception.

[timunie]

Could anyone check with nightly builds as well?

[jpmikkers]

@timunie just tried, same crash happens with '11.2.999-cibuild0051600-alpha'