Make rcParams.copy() return a new RcParams instance. #21042
Merged
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... so that
rcParams.update(<previously-copied-rcparams-instance>)
doesn't emit DeprecationWarnings even if some entries are deprecated.
(See comment in tests.)
Supersedes #21015.
Closes #13118. Closes #15781. Closes #20249.
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).