Properly set and inherit backend_version. #24197
Merged
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It's not really clear if we really need to keep the backend_version backend attribute, but currently it is getting overridden by _Backend.export to "unknown" (as can be checked e.g. by printing backend_agg.backend_version). Move the definition to within the _Backend class to fix that, and inherit that information where possible.
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PR Checklist
Tests and Styling
pytest
passes).flake8-docstrings
and runflake8 --docstring-convention=all
).Documentation
doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).