Calling setdefault on a MutableDict does not trigger change

[John Jiang]

I'm using flask-sqlalchemy

class Data(db.Model):
    blob = db.Column(MutableDict.as_mutable(JSON), default={})

data.blob.setdefault('blah', {})
db.session.add(data)
db.session.commit()

blob does not save the changes.

[Mike Bayer]

• Fixed bug in mutable extension where :class:.MutableDict did not report change events for the setdefault() dictionary operation. fixes #3051

→ <<cset aa12fdb40e66>>

[Mike Bayer]

• Fixed bug in mutable extension where :class:.MutableDict did not report change events for the setdefault() dictionary operation. fixes #3051

→ <<cset cf1ba8e10166>>