Fix classmethod check for mixin case #618
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I have a case of using a mixin on my test classes that started failing with 3.3.0 in upgrade PR adamchainz/django-mysql#484. It was caused by #598.
It looks like this was actually a latent failure in the way
_classmethod_is_defined_at_leaf
was picking the 'super method' - it would iterate further up the tree despite coming across the next method in the resolution chain. Also by not using__mro__
the order of the base classes wasn't strictly being observed, although I don't think that affects my mixin case.Added a test that fails before and passes after.