Before, on the backend if you check the `opt_out` checkbox and saving on a `mailing.contact`, the entire row (`mailing.contact.subscription`) would be unlinked. Combined with `mass_mailing_list_dynamic` this means the contact would just be re-subscribed over and over.
After, check `opt_out` will fill `unsubscription_date` and the row will stay. Tests in `mass_mailing_list_dynamic` pass.
- In DB which use large amounts of records and intesive use of
mass_mailings, not optimized compute records lead to a drastical
decrease of performance
Without this patch, users without access to reading and editing mass mailing contact records are now unable to change a partner's name or email. They'd recieve an exception such as:
AccessError: Sorry, you are not allowed to access this document. Only users with the following access level are currently allowed to do that:
- Mass Mailing/User
(Document model: mail.mass_mailing.contact)
Restrictive ACLs shouldn't restrict normal user operation nor DB consistency, so using sudo mode now and testing behavior.