[IMP] "sent" field for mail.message

__init__.py

@@ -0,0 +1 @@
+import models

models.py

@@ -0,0 +1,11 @@
+from openerp import api, models, fields, SUPERUSER_ID
+
+class mail_message(models.Model):
+    _inherit = 'mail.message'
+
+    @api.one
+    @api.depends('author_id', 'notification_ids')
+    def _get_sent(self):
+        self.sent = len(self.notified_partner_ids) > 1 or len(self.notified_partner_ids)==1 and self.notified_partner_ids[0].id != self.author_id.id
+
+    sent = fields.Boolean('Sent', compute=_get_sent, help='Was message sent to someone', store=True)

views.xml

@@ -13,6 +13,7 @@
             <field name="params" eval="&quot;{
                 'domain': [
                     ('author_id.user_ids', 'in', [uid]),
+                    ('sent', '=', True),
                 ],
                 'view_mailbox': True,
                 'show_compose_message': False