bug#13027: Activating mark does not run mark activation hook

[Kelly Dean]

In 24.2, from emacs -Q
(add-hook 'deactivate-mark-hook (lambda () (message "Deactivate mark hook 
called.")))
(add-hook 'activate-mark-hook (lambda () (message "Activate mark hook 
called.")))
C-SPC C-SPC C-SPC C-SPC
In *Messages* you get:

Mark set
Activate mark hook called.
Deactivate mark hook called.
Mark deactivated
Mark activated
Deactivate mark hook called.
Mark deactivated

Notice that the second "Activate mark hook called" is missing.

simple.el has:
(defun activate-mark ()
  "Activate the mark."
  (when (mark t)
    (setq mark-active t)
    (unless transient-mark-mode
      (setq transient-mark-mode 'lambda))))

The bug is fixed by changing that to:
(defun activate-mark ()
  "Activate the mark."
  (when (mark t)
    (setq mark-active t)
    (run-hooks 'activate-mark-hook)
    (unless transient-mark-mode
      (setq transient-mark-mode 'lambda))))