fix: Editor: Improve minimap scrollbar handling
http://bugs.activestate.com/attachment.cgi?id=16287
rn=
a=ericp

(integrated from komodo (trunk) change 81468 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13466 b87d16e7-d29f-4ee1-b5ec-817d645d335f