RATIONALE
Purpose of this commit is to be explicit in subtype chosen when invoking the
message composer / calling message_post. As default value may not always be
clear, better be explicit in case the composer default value changes.
SPECIFICATIONS
Add explicit references to subtype when it is not obvious what will be the
final subtype, notably when using helpers (post_with_view or template which
uses the composer that is not crystal clear in its subtype management).
In this commit we also add support of XMLID-based subtype when invoking the
composer. A ``default_subtype_xmlid`` context key is transformed into a
``default_subtype_id``, to be used notably in JS where we cannot easily
use a ``ref``-like statement. Post API now also supports 'subytpe_xmlid'
argument allowing to give the xml id and ease calling the methods.
Use ``_xmlid_to_res_id`` to get directly the ID of subtypes in order to
avoid useless queries from ``ref`` that does an exists.
Also remove useless values given to post API, notably author_id that is by
default the current users' partner.
Task-2710804 (Mail: Clean MailThread Posting API)
Part-of: odoo/odoo#99482
Thibault Delavallée
418761e344