views: go to defn: don't go if the location has changed
http://bugs.activestate.com/show_bug.cgi?id=99988

(integrated from komodo (trunk) change 81371 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13413 b87d16e7-d29f-4ee1-b5ec-817d645d335f