Editor: Revise the way language changes on saveAs so that languages change only when the extension changes.
http://bugs.activestate.com/show_bug.cgi?id=100142
r=toddw

(integrated from komodo (trunk) change 82181 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13699 b87d16e7-d29f-4ee1-b5ec-817d645d335f