magnars/expand-region.el — pull request #15 by kidd (2012-02-05 19:52:40+00:00)
Title: non transient mark fixes. 

As explained in http://www.gnu.org/software/emacs/manual/html_node/emacs/Persistent-Mark.html#Persistent-Mark, "When Transient Mark mode is off, the mark is never deactivated" so here's a hack to use disable it manually.