Message post should always be called on a record (ensure_one). That way we
ensure posting a message is always done in a record's context with right
values computed (reply_to, followers, ...)
Message_notify can be called on record or on mail_thread and must have
partner_ids. It is based on the recently modified user_notification mechanism
and allow to notify a partner on a record or just to push him a message
(aka, not linked to a record).
Small performance improvement
* browse recipients instead of search in _notify_email_recipients;
* todo in future optimizations: mayybe be improve by searching on ids
and is_blacklist immediately;
Related to task 1943901
Linked to PR #32404
XavierDo
6f43977a4e