[FIX] im_livechat,mail: detach chat on the receiver side

This commit concerns DM and livechat channels. Those channels are now
automatically detached on the receiver side. This allows users to directly
reply to DM's or livechats without coming back to the client action.

Note that they aren't detached if the user previously manually closed the
channel's chat window.

addons/im_livechat/models/im_livechat_channel.py

@@ -173,6 +173,8 @@ class ImLivechatChannel(models.Model):
             'public': 'public',
             'email_send': False,
         })
+        # minimize channel on operator's side
+        mail_channel._minimize([operator_partner_id])
         return mail_channel.sudo().with_context(im_livechat_operator_partner_id=operator_partner_id).channel_info()[0]
 
     @api.model

addons/mail/models/mail_channel.py

@@ -140,6 +140,16 @@ class Channel(models.Model):
         for mail_channel in self:
             mail_channel.write({'channel_partner_ids': [(4, pid) for pid in mail_channel.mapped('group_ids').mapped('users').mapped('partner_id').ids]})
 
+    @api.multi
+    def _minimize(self, partner_ids):
+        self.ensure_one()
+        domain = [('channel_id', '=', self.id), ('partner_id', 'in', tuple(partner_ids))]
+        channel_partners = self.env['mail.channel.partner'].search(domain)
+        channel_partners.write({
+            'is_minimized': True,
+            'fold_state': 'open',
+        })
+
     @api.multi
     def action_follow(self):
         self.ensure_one()
@@ -317,8 +327,8 @@ class Channel(models.Model):
             :rtype : dict
         """
         if partners_to:
-            partners_to.append(self.env.user.partner_id.id)
-            # determine type according to the number of partner in the channel
+            partners = partners_to + [self.env.user.partner_id.id]
+            # determine type according to the number of partners in the channel
             self.env.cr.execute("""
                 SELECT P.channel_id as channel_id
                 FROM mail_channel C, mail_channel_partner P
@@ -328,7 +338,7 @@ class Channel(models.Model):
                     AND channel_type LIKE 'chat'
                 GROUP BY P.channel_id
                 HAVING COUNT(P.partner_id) = %s
-            """, (tuple(partners_to), len(partners_to),))
+            """, (tuple(partners), len(partners),))
             result = self.env.cr.dictfetchall()
             if result:
                 # get the existing channel between the given partners
@@ -339,14 +349,16 @@ class Channel(models.Model):
             else:
                 # create a new one
                 channel = self.create({
-                    'channel_partner_ids': [(4, partner_id) for partner_id in partners_to],
+                    'channel_partner_ids': [(4, partner_id) for partner_id in partners],
                     'public': 'private',
                     'channel_type': 'chat',
                     'email_send': False,
-                    'name': ', '.join(self.env['res.partner'].sudo().browse(partners_to).mapped('name')),
+                    'name': ', '.join(self.env['res.partner'].sudo().browse(partners).mapped('name')),
                 })
-                # broadcast the channel header to the other partner (not me)
-                channel._broadcast(partners_to)
+                # minimize the DM on other partners' side
+                channel._minimize(partners_to)
+                # broadcast the channel header
+                channel._broadcast(partners)
             return channel.channel_info()[0]
         return False