Prefer warn_deprecated instead of warnings.warn. #11297
Merged
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warn_deprecated has the advantage of always listing the deprecation
version and removal version. Hopefully, in the future it will also be
able to set the stacklevel more systematically.
Redesign the way deprecation of rcParams is done to make it use
warn_deprecated. Merge obsolete_set into deprecated_ignore_map as they
are semantically similar, it's just that there's no alternative rcParam
for obsolete_set. Rename deprecated_set to deprecated_remain_as_none as
the former name really doesn't say anything about the deprecation
semantics.
text.dvipnghack and axes.hold should be completely removed but that'll
be another PR.
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