[IMP] base: reduce ref calls in users write override.

ref() always trigger a database query to verify record still exists.

In frequently used methods, it's best to avoid ref calls if not needed:

* either the records should always exist
* either the record isn't always needed and the ref can be sometimes
avoided.

X-original-commit: c1e05da7b71c8274aff00d67f8d1bc7e209fcaab

odoo/addons/base/models/res_users.py

@@ -1271,8 +1271,10 @@ class UsersView(models.Model):
     def write(self, values):
         values = self._remove_reified_groups(values)
         res = super(UsersView, self).write(values)
+        if 'company_ids' not in values:
+            return res
         group_multi_company = self.env.ref('base.group_multi_company', False)
-        if group_multi_company and 'company_ids' in values:
+        if group_multi_company:
             for user in self:
                 if len(user.company_ids) <= 1 and user.id in group_multi_company.users.ids:
                     user.write({'groups_id': [(3, group_multi_company.id)]})