Unit tests crash on PySide6

[kristjanvalur]

Some internal issues with PySide6 cause the test suite to crash at random places.
PR #153 contains an attempted workaround, until PySide6 gets fixed upstream.

To repro:

uv virtualenv --python 3.13
uv pip install pyside6
uv run pytest --verbose

This will randomly crash on windows. If more complex tests are added later in the test suite the likelyhood of crashes increases.

[kristjanvalur]

I've done some further testing and it appers that this behaviour started happening with PySide6==6.8.0. Testing with earlier versions is just fine.
Modify the above code with uv pip install pyside6==6.8.0 to isolate to this particular version, and compare, e.g. , with 6.7.3 which is the previous release.

[kristjanvalur]

I've created an issue on the Qt project for this: https://bugreports.qt.io/browse/PYSIDE-3165