fix: Editor: Improve editor scroll handling and scrolling performance
http://bugs.activestate.com/show_bug.cgi?id=100956
rn=
r=marky

(integrated from komodo (trunk) change 83249 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14049 b87d16e7-d29f-4ee1-b5ec-817d645d335f