Purpose of this commit is to clearly check input of ``message_post`` method
and its main helpers in order to prevent wrong usage of message post API.
Some values used to populate message fields should not be set directly when
posting or logging messages. Indeed they may be part of other process (like
notification process managed by ``_notify_thread``, or could be setup by
custom routes like 'reaction_ids', or custom usage of 'model' and 'res_id'
that could conflicts with record on which methods are called).
We therefore add checks and cleanup in those methods to be sure the API
is used as intended and avoid unwanted side effects.
Task-2710804 (Mail: Clean MailThread Posting API)
Part-of: odoo/odoo#99482
Thibault Delavallée
2175bde607