hunk.code_window:     _mail_flat_thread = True  # flatten the discussino history
       _mail_post_access = 'write'  # access required on the document to post on it
       _mail_mass_mailing = False  # enable mass mailing on this model
       message_is_follower = fields.Boolean('Is Follower', compute='_compute_is_follower')
       message_follower_ids = fields.One2many(
           'mail.followers', 'res_id', string='Followers',
           domain=lambda self: [('res_model', '=', self._name)])
  
hunk.labels: keep keep keep keep replace keep keep keep
hunk.after_edit:     message_is_follower = fields.Boolean(
           'Is Follower', compute='_compute_is_follower', search='_search_is_follower')
  
hunk.file_path: addons/mail/models/mail_thread.py
hunk.type: replace
file: <?xml version="1.0"?>
  <openerp>
      <data>
  
          <record model="ir.ui.view" id="view_mail_mass_mailing_test_form">
              <field name="name">mail.mass_mailing.test.form</field>
              <field name="model">mail.mass_mailing.test</field>
              <field name="arch" type="xml">
                  <form string="Send a Sample Mail">
                      <p class="text-muted">
                          Send a sample of this mailing to the above of email addresses for test purpose.
                      </p>
                      <group>
                          <field name="email_to"/>
                      </group>
                      <footer>
                          <button string="Send Sample Mail" name="send_mail_test" type="object" class="btn-primary"/>
                          <button string="Cancel" class="btn-default" special="cancel" />
                      </footer>
                  </form>
              </field>
          </record>
  
          <record id="action_mail_mass_mailing_test" model="ir.actions.act_window">
              <field name="name">Mailing Test</field>
              <field name="res_model">mail.mass_mailing.test</field>
              <field name="view_type">form</field>
              <field name="view_mode">form</field>
              <field name="target">new</field>
          </record>
  
      </data>
  </openerp>
  