[trunk]can't able to download attachment via in Inbox

[Twinkle Christian(OpenERP)]

Try with latest trunk any with runbot or localhost,
Go to Messaging > Inbox > click on any attachement , It gives error :

2013-08-19 12:25:08,105 3268 ERROR trnk openerp.addons.web.http: An exception occured during an http request
Traceback (most recent call last):
  File "/home/tch/workspace/rdtools/web/trunk/addons/web/http.py", line 414, in dispatch
    r = self._call_function(**self.params)
  File "/home/tch/workspace/rdtools/web/trunk/addons/web/http.py", line 174, in _call_function
    return self.func(*args, **kwargs)
  File "/home/tch/workspace/rdtools/web/trunk/addons/web/http.py", line 1048, in nfunc
    return func(*args, **kwargs)
  File "/home/tch/workspace/rdtools/web/trunk/addons/web/http.py", line 507, in <lambda>
    return lambda self, *args, **kwargs: nv(self, request, *args, **kwargs)
  File "/home/tch/workspace/rdtools/addons/trunk/mail/controllers/main.py", line 24, in download_attachment
    ('Content-Disposition', content_disposition(filename, req))])
TypeError: content_disposition() takes exactly 1 argument (2 given)
2013-08-19 12:25:08,107 3268 INFO trnk werkzeug: 127.0.0.1 - - [19/Aug/2013 12:25:08] "GET /mail/download_attachment?model=mail.message&id=7&method=download_attachment&attachment_id=3 HTTP/1.1" 500 -

Thank you.