[FIX] mail: notify parent message on message auto subscribe.

When auto subscribing to a message
(For instance, change the ```user_id``` field on a record,
like an invoice)
The new user is notified of the last message of the thread.
He must be notified of the parent message as well,
to have access to the first message of the thread,
to prevent access rights issues to the thread.

This mechanism is applied in the _notify method
of model ```mail.message``` as well, for the same reasons.

opw-630286

0 files changed, 0 insertions, 0 deletions