Fix various use case of HTML encoding / escaping in mail flows. Depending on
functional flow HTML entities could appear as they were not correctly
managed as valid HTML.
Notably when managing attachments in '_process_attachments_for_post' we
should return Markup-ized HTML to be sure it is considered as valid in
other post processing.
Task-3675159 (Mail: correctly escape HTML when updating content)
Task-3619348 (Mail: propagate markup flag when processing attachments)
closesodoo/odoo#148769
X-original-commit: f4bf63077d4129807e00e15b833e47623869491f
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Thibault Delavallée
bc95b89d2d