[FIX] website_mail: force the copy method not to copy website_message_ids field, we do not want duplicated emails (opw 605975).

bzr revid: mat@openerp.com-20140402123707-r3e38b64zsheq0tn

addons/website_mail/models/mail_thread.py

@@ -21,7 +21,7 @@
 
 from openerp.osv import osv, fields
 
-
+# TODO for trunk, remove me
 class MailThread(osv.Model):
     _inherit = 'mail.thread'
 
@@ -35,3 +35,7 @@ class MailThread(osv.Model):
             help="Website communication history",
         ),
     }
+
+    def copy(self, cr, uid, id, default=None, context=None):
+        default['website_message_ids'] = []
+        return super(MailThread, self).copy(cr, uid, id, default=default, context=context)