Editor: After pressing tab, if we either indented/dedented a region, or inserted a tab, update the caretX setting (driven by a pref in Editor/Smart Editing.
http://bugs.activestate.com/show_bug.cgi?id=95409
r=toddw
rn=

(integrated from komodo (trunk) change 81689 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13554 b87d16e7-d29f-4ee1-b5ec-817d645d335f