fix: Code Intelligence: Improve performing of directory scanning
http://bugs.activestate.com/show_bug.cgi?id=100077
* don't re-add the notification everytime an attribute changes,
  instead, leave that up to the caller
rn=

(integrated from komodo (trunk) change 81462 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13463 b87d16e7-d29f-4ee1-b5ec-817d645d335f