WSOD when forwarding emails

See http://forum.civicrm.org/index.php/topic,19712.0/topicseen.html

Looking at the code for CRM/Mailing/Form/ForwardMailing.php it seems that the API was changed from v2 to v3, but remnants of the v2 code remain (eg, 'mailer' should be 'mailing' on line 38; the API function call is the v2 one on line 150). I tried patching that file, and succeeded in avoiding the WSOD, but the email was not forwarded.