Make backend_gtk3foo importable on headless environments. #19441
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This should ultimately make it easier to generate apidocs on CI.
The change in value of
cursord
only happens on headless envs, wherethe module was not importable at all before, so that's not an API break.
PR Summary
PR Checklist
pytest
passes).flake8
on changed files to check).flake8-docstrings
and runflake8 --docstring-convention=all
).doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).