[IMP] sale_coupon: Allow helpdesk users to send coupon by email

Purpose
=======

Helpdesk users don't have the right to write on a coupon.

When sending a coupon by email, the coupon is marked as 'sent'.

Allow users to send coupons by executing the state change in sudo.

closes odoo/odoo#45091

Taskid: 2179609
Related: odoo/enterprise#8143
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/sale_coupon/models/mail_compose_message.py

@@ -10,5 +10,6 @@ class MailComposeMessage(models.TransientModel):
     def send_mail(self, **kwargs):
         for wizard in self:
             if self._context.get('mark_coupon_as_sent') and wizard.model == 'sale.coupon' and wizard.partner_ids:
-                self.env[wizard.model].browse(wizard.res_id).state = 'sent'
+                # Mark coupon as sent in sudo, as helpdesk users don't have the right to write on coupons
+                self.env[wizard.model].sudo().browse(wizard.res_id).state = 'sent'
         return super().send_mail(**kwargs)