[FIX] mail: create partner from template in right company

Before this commit, when creating a partner automatically when creating
a message with a template, the company on the partner was wrongly set

After this commit, we try to retrieve the company from the model on the template

OPW 1934392

closes odoo/odoo#30893

addons/mail/models/mail_template.py

@@ -385,12 +385,20 @@ class MailTemplate(models.Model):
                 results[res_id].pop('partner_to', None)
                 results[res_id].update(recipients)
 
+        records_company = None
+        if self._context.get('tpl_partners_only') and self.model and results and 'company_id' in self.env[self.model]._fields:
+            records = self.env[self.model].browse(results.keys()).read(['company_id'])
+            records_company = {rec['id']: rec['company_id'][0] for rec in records}
+
         for res_id, values in results.items():
             partner_ids = values.get('partner_ids', list())
             if self._context.get('tpl_partners_only'):
                 mails = tools.email_split(values.pop('email_to', '')) + tools.email_split(values.pop('email_cc', ''))
+                Partner = self.env['res.partner']
+                if records_company:
+                    Partner = Partner.with_context(default_company_id=records_company[res_id])
                 for mail in mails:
-                    partner_id = self.env['res.partner'].find_or_create(mail)
+                    partner_id = Partner.find_or_create(mail)
                     partner_ids.append(partner_id)
             partner_to = values.pop('partner_to', '')
             if partner_to:

addons/test_mail/models/test_mail_models.py

@@ -26,6 +26,7 @@ class MailTestStandard(models.Model):
     email_from = fields.Char()
     user_id = fields.Many2one('res.users', 'Responsible', track_visibility='onchange')
     umbrella_id = fields.Many2one('mail.test', track_visibility='onchange')
+    company_id = fields.Many2one('res.company')
 
 
 class MailTestActivity(models.Model):

addons/test_mail/tests/test_mail_template.py

@@ -3,6 +3,7 @@
 
 import base64
 from datetime import datetime, timedelta
+from unittest.mock import patch
 
 from odoo.addons.test_mail.tests.common import BaseFunctionalTest, MockEmails, TestRecipients
 from odoo.addons.test_mail.tests.common import mail_new_test_user
@@ -202,3 +203,36 @@ class TestMailTemplate(BaseFunctionalTest, MockEmails, TestRecipients):
     #         self.env['mail.mail'].process_email_queue(ids=[mail_in_2_days.id])
     #         self.assertEqual(mail_in_2_days.state, 'outgoing')
     #         self.assertEqual(mail_now.exists() | mail_in_2_days.exists(), mail_in_2_days)
+
+    def test_create_partner_from_tracking_multicompany(self):
+        company1 = self.env['res.company'].create({'name': 'company1'})
+        self.env.user.write({'company_ids': [(4, company1.id, False)]})
+        self.assertNotEqual(self.env.user.company_id, company1)
+
+        email_new_partner = "diamonds@rust.com"
+        Partner = self.env['res.partner']
+        self.assertFalse(Partner.search([('email', '=', email_new_partner)]))
+
+        template = self.env['mail.template'].create({
+            'model_id': self.env['ir.model']._get('mail.test.track').id,
+            'name': 'AutoTemplate',
+            'subject': 'autoresponse',
+            'email_from': self.env.user.email_formatted,
+            'email_to': "${object.email_from}",
+            'body_html': "<div>A nice body</div>",
+        })
+
+        def patched_message_track_post_template(*args, **kwargs):
+            args[0].message_post_with_template(template.id)
+            return True
+
+        with patch('odoo.addons.mail.models.mail_thread.MailThread._message_track_post_template', patched_message_track_post_template):
+            self.env['mail.test.track'].create({
+                'email_from': email_new_partner,
+                'company_id': company1.id,
+                'user_id': self.env.user.id,  # trigger tracking,
+            })
+
+        new_partner = Partner.search([('email', '=', email_new_partner)])
+        self.assertTrue(new_partner)
+        self.assertEqual(new_partner.company_id, company1)