[Sqlalchemy-tickets] Issue #3191: Sorting order is messed up with ordering_list (zzzeek/sqlalchemy)

[Aleksandr O. <iss...@bi...>]

New issue 3191: Sorting order is messed up with ordering_list
https://bitbucket.org/zzzeek/sqlalchemy/issue/3191/sorting-order-is-messed-up-with

Aleksandr Osipov:

Sorting order is messed up if we replace existing list with new one with some items removed.
This happens in the function orm.collections.bulk_replace, when removing items missing in new collection from old one in order to fire events.

Calling .remove method of ordering_list cause reordering of items in old collection, but this also affects ordering in new collection.

Changing two loops in orm.collections.bulk_replace seems to solve the problems.