'email_from' fields are not necessary on 'sale.order.cancel' and 'survey.invite'
as anyway we always use the current user's email and field is not present in
form view. Override of default_get to raise about invalid email_from is not
necessary as anyway it raises when posting the message. Giving author_id to
message_post is sufficient as it computes email_from based on author when given.
Add 'render_model' in views, as it is part of the domain given to 'template_id'
field of composer mixin. When missing, also add 'lang' and 'template_id' that
come from the render mixin.
Use '_render_field' when possible instead of '_render_template' as its API
is simpler and uses field definition for rendering parameters.
Task-2710804 (Mail: Clean MailThread Posting API)
Part-of: odoo/odoo#99482
Thibault Delavallée
95859f6fb5