odoo/odoo — pull request #3499 by petrus-v (2014-11-06 15:23:21+00:00)
Title: [FIX #1216] Display m2m changes on listview

To find out more information how to reproduce this issue have a look to #1216.

This is a fix, however cleared the __display attribute is need only for m2m fields.
As mentioned in render_cell method this should be done in an other way.

hope it's help!