Preferences: Ensure document encodings are saved via file preferences
http://bugs.activestate.com/show_bug.cgi?id=101625
r=marky
rn=

(integrated from komodo (trunk) change 83199 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14041 b87d16e7-d29f-4ee1-b5ec-817d645d335f