bug#23245: 25.0.92; cua-mode inhibits deactivate-region-hook

["Thomas Frössman" <thomasf@jossystem.se>]

I noticed that https://github.com/fgallina/region-bindings-mode started
to fail to deactive from time to time after I swiched to the emacs-25
branch.

I think I have tracked the problem down to cua-mode being the thing
which causes this.

I have been able to reproduce this problem.  If i use the init.el below
and repeatadly activates and deactivates regions for a while an AM
is logged to the messages buffer without a DM following the
deactivation, after this (region-active-p) evaluates to nil but there
was to deactivation hook fired.

(defun AM ()
  (message "AM"))
(defun DM ()
  (message "DM" ))
(add-hook 'activate-mark-hook 'AM)
(add-hook 'deactivate-mark-hook 'DM)
(cua-mode)



In GNU Emacs 25.0.92.8 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
 of 2016-04-08 built on transwhale
Repository revision: 7ad1d075b940f276adaf3b6bb0c024079c403f80
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:	Ubuntu 15.10

Configured using:
 'configure --with-x-toolkit=gtk3 --with-file-notification=inotify
 --without-pop --without-toolkit-scroll-bars --with-xwidgets'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB GTK3 X11 XWIDGETS

Important settings:
  value of $LC_COLLATE: sv_SE.utf8
  value of $LC_CTYPE: sv_SE.utf8
  value of $LC_MESSAGES: en_US.utf8
  value of $LC_MONETARY: sv_SE.utf8
  value of $LC_NUMERIC: sv_SE.utf8
  value of $LC_TIME: sv_SE.utf8
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8