Description of the bug

When specifying an inventory with a base_url that is different from the url, the base_url is ignored after the 0.28.0 rework. The rendered cross-reference URL uses the url value, not the base_url value.

The issue is that the new Inventory dataclass in https://github.com/mkdocstrings/python/blob/main/src/mkdocstrings_handlers/python/_internal/config.py#L963-L992 has a base attribute, which is also returned in the _config property as base, and not base_url. However, the load_inventory method still expects a base_url keyword, but now gets base=... which is put into **kwargs and ignored.

Environment information

python -m mkdocstrings_handlers.python._internal.debug  # | xclip -selection clipboard

• System: Linux-6.11.0-21-generic-x86_64-with-glibc2.39
• Python: cpython 3.12.3 (/home/stefan/salling/ml-utils-pipeline-new/.venv/bin/python)
• Environment variables:
• Installed packages:
  • mkdocstrings-python v1.16.8

Additional context

I'll be happy to make a PR fixing this, but I could use some help in figuring out how to add test(s) 🙂