quicksilver/Quicksilver — pull request #534 by pjrobertson (2011-10-27 09:01:41+00:00)
Title: Denied removal of plugins within the QS.app main bundle

Exactly what is says on the tin :)

Pretty simple really. Check the plugin path to see if it contains the path of the mainBundle (QS.app)

If so, remove the *other* one.