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3c68c7c034
Fixed event listening issue where event listeners added to a superclass
would be lost if a subclass were created which then had its own listeners
associated. The practical example is that of the :class:`.sessionmaker`
class created after events have been associated with the
:class:`_orm.Session` class.
Fixes: #8467
Change-Id: I9bdba8769147e30110a09900d4a577e833ac3af9
(cherry picked from commit d3e0b8e750)