Backport PR #20403: FIX: if we have already subclassed mixin class ju… #20404
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…st return
Merge pull request #20403 from tacaswell/noop_subplot_class_factory
FIX: if we have already subclassed mixin class just return
Conflicts:
lib/matplotlib/cbook/init.py
- logic is in axes/_subplots.py on this branch