Merge PR #1432 into 16.0

Signed-off-by hbrunn

mail_template_substitute/tests/test_mail_template_substitute.py

@@ -87,7 +87,7 @@ class TestMailTemplateSubstitute(TransactionCase):
         self.smt1.mail_template_substitution_rule_ids.domain = "[]"
         self.mail_compose.with_context(
             active_ids=self.partners.ids
-        ).onchange_template_id_wrapper()
+        )._onchange_template_id_wrapper()
         self.assertEqual(self.mail_compose.template_id, self.smt2)
 
     def test_default_get(self):

mail_template_substitute/wizards/mail_compose_message.py

@@ -32,10 +32,10 @@ class MailComposeMessage(models.TransientModel):
         return result
 
     @api.onchange("template_id")
-    def onchange_template_id_wrapper(self):
+    def _onchange_template_id_wrapper(self):
         substitution_template = self._get_substitution_template(
             self.composition_mode, self.template_id, [self.res_id]
         )
         if substitution_template:
             self.template_id = substitution_template
-        return super().onchange_template_id_wrapper()
+        return super()._onchange_template_id_wrapper()