fix: Toolbox: Stop duplication of snippets when dropping snippet text
http://bugs.activestate.com/show_bug.cgi?id=103113
rn=

(integrated from komodo (trunk) change 84955 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14348 b87d16e7-d29f-4ee1-b5ec-817d645d335f