[FIX] unsubscribe and then subscribe to the event, to avoid duplication of new posts in base.js

[FIX] replace "needaction_partner_ids" to "partner_ids" in models.py

mail_base/static/src/js/base.js

@@ -1099,6 +1099,8 @@ function init(){
     var load_menu_id = ir_model.call("xmlid_to_res_id", ["mail.mail_channel_menu_root_chat"], {}, {shadow: true});
     var load_action_id = ir_model.call("xmlid_to_res_id", ["mail.mail_channel_action_client_chat"], {}, {shadow: true});
 
+    // unsubscribe and then subscribe to the event, to avoid duplication of new messages
+    bus.off('notification');
     bus.on('notification', null, chat_manager.mail_tools.on_notification);
 
     return $.when(load_menu_id, load_action_id, load_channels, load_emojis).then(function (menu_id, action_id) {

mail_sent/models.py

@@ -8,13 +8,13 @@ class MailMessage(models.Model):
     sent = fields.Boolean('Sent', compute="_get_sent", help='Was message sent to someone', store=True)
 
     @api.one
-    @api.depends('author_id', 'needaction_partner_ids')
+    @api.depends('author_id', 'partner_ids')
     def _get_sent(self):
         self_sudo = self.sudo()
-        self_sudo.sent = len(self_sudo.needaction_partner_ids) > 1 \
-                         or len(self_sudo.needaction_partner_ids) == 1 \
+        self_sudo.sent = len(self_sudo.partner_ids) > 1 \
+                         or len(self_sudo.partner_ids) == 1 \
                             and self_sudo.author_id \
-                            and self_sudo.needaction_partner_ids[0].id != self_sudo.author_id.id
+                            and self_sudo.partner_ids[0].id != self_sudo.author_id.id
 
     @api.multi
     def message_format(self):