Make used tex packages consistent between ps and other backends. #20446
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... by wrapping ps-specific packages in
\@ifpackageloaded
, which makestheir use transparent to the end user (if they already loaded it
themselves, we don't do anything). So don't mention them anymore in the
matplotlibrc docs either.
Also, graphicx doesn't need the dvips option (the graphicx docs
explicitly state "normally you should... allow it to be defaulted
automatically".
(The pgf backend is a completely different beast and has its own custom
preamble anyways.)
Closes #10042.
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).