PURPOSE
Purpose of this task is to cleanup attachment management done in generic mail
models overrides and move it in account as model overrides.
SPECIFICATIONS
Account_edi and various l10n submodules hold some custom code to generate and
handle EDI attachments. It is used to add attachments linked using AccountMove
specific 'edi_document_ids' field when sending emails based on templates.
Currently MailTemplate is overridden in accounting modules to hold code related
to AccountMove and AccountEdiDocument attachments manipulation. This is linked
to EDI and report naming, not mail specific. This should therefore not be
implemented at template level, but in those specific models.
For that purpose we introduce a method in MailThread that allow to handle
attachments when being in a template context. An override in account_edi
allows to implement its specific behavior.
By the way an old docstring in l10n_it_edi that was quite unrelated to the
override is also removed, as it was more confusing than helping.
Task-2792146 (Mail: Move model-dependent code from composer / template)
Task-2710804 (Mail: Clean MailThread API)
Part-of: odoo/odoo#106658
Thibault Delavallée
04c1959456