delete-orphan cascade probably doesn't work with dynamic relation

[Mike Bayer]

in test/orm/cascade.py M2MCascadeTest

    @testing.resolve_artifact_names
    def test_delete_orphan_dynamic(self):
        mapper(A, a, properties={
            # if no backref here, delete-orphan failed until #427 was
            # fixed
            'bs': relation(B, secondary=atob, cascade="all, delete-orphan", single_parent=True, lazy="dynamic")
        })
        mapper(B, b)

        sess = create_session()
        b1 = B(data='b1')
        a1 = A(data='a1', bs=[b1](b1))
        sess.add(a1)
        sess.flush()

        a1.bs.remove(b1)
        sess.flush()
        assert atob.count().scalar() ==0
        assert b.count().scalar() == 0
        assert a.count().scalar() == 1

fails

[Mike Bayer]

this test passes with 0.5 and 0.6. Added an 0.6 test in 659ca0c5088b2b6dcd66e33bb9aff79aaffc421a.

[Mike Bayer]

Removing milestone: 0.5.xx (automated comment)