[FIX] mass_mailing: filter emails to avoid duplicates

When subscribing a user to a mailing list, the `mail.mass_mailing.contact`
created is processed to identify it's name and email from the address (method
`get_name_email` called in `add_to_list` and `name_create`).
For a better consistency, the search of existing contacts should also be done
using the method `get_name_email`.

This avoids that subscribing twice `Example <example@example.com>` fails to
detect duplicates and creates two subscriptions.

Closes #12265

addons/mass_mailing/controllers/main.py

@@ -65,8 +65,12 @@ class MassMailController(http.Controller):
     def subscribe(self, list_id, email, **post):
         cr, uid, context = request.cr, request.uid, request.context
         Contacts = request.registry['mail.mass_mailing.contact']
+        parsed_email = Contacts.get_name_email(email, context=context)[1]
 
-        contact_ids = Contacts.search_read(cr, SUPERUSER_ID, [('list_id', '=', int(list_id)), ('email', '=', email)], ['opt_out'], context=context)
+        contact_ids = Contacts.search_read(
+            cr, SUPERUSER_ID,
+            [('list_id', '=', int(list_id)), ('email', '=', parsed_email)],
+            ['opt_out'], context=context)
         if not contact_ids:
             Contacts.add_to_list(cr, SUPERUSER_ID, email, int(list_id), context=context)
         else: