[FIX] mass_mailing: ease marketing automation inheritance

Purpose of this commit is to add an anchor in mass mailing view in order
to ease some marketing automation fixes.

Also reset the sms composer context when sending sms from an sms mailing
as it may create some issues when sending manually an sms from a marketing
activity (see enteprise). Indeed wrong participant is chosen.

Task ID 2073158 (marketing automation fixes)
PR #37185
PR odoo/enterprise#5693

addons/mass_mailing/views/mailing_mailing_views.xml

@@ -139,7 +139,7 @@
                                 attrs="{'readonly': [('state', 'in', ('sending', 'done'))]}"/>
                             <field name="subject" string="Subject" attrs="{'readonly': [('state', 'in', ('sending', 'done'))]}"/>
                             <label for="mailing_model_id" string="Recipients"/>
-                            <div>
+                            <div name="mailing_model_id_container">
                                 <div class="row">
                                     <div class="col-xs-12 col-md-3" >
                                         <field name="mailing_model_id" widget="selection" required="True"

addons/mass_mailing_sms/models/mailing_mailing.py

@@ -19,7 +19,7 @@ class Mailing(models.Model):
     sms_template_id = fields.Many2one('sms.template', string='SMS Template', ondelete='set null')
     sms_has_insufficient_credit = fields.Boolean(
         'Insufficient IAP credits', compute='_compute_sms_has_insufficient_credit',
-        help='UX Field to propose to buy IAP credits') 
+        help='UX Field to propose to buy IAP credits')
     # opt_out_link
     sms_allow_unsubscribe = fields.Boolean('Include opt-out link', default=True)
 
@@ -182,7 +182,7 @@ class Mailing(models.Model):
             if not res_ids:
                 raise UserError(_('There is no recipients selected.'))
 
-            composer = self.env['sms.composer'].create(mailing._send_sms_get_composer_values(res_ids))
+            composer = self.env['sms.composer'].with_context(active_id=False).create(mailing._send_sms_get_composer_values(res_ids))
             # extra_context = self._get_mass_mailing_context()
 
             # auto-commit except in testing mode