bug#22404: 25.1.50; Forcing `window-scroll-functions` to run.

[Keith David Bershatsky]

Attached is the next draft of the `window-start-end-hook`, which applies to the 
master branch as of commit "ea626c72e590aa7a45fd26df42240854e4225cef" on March 
10, 2015.

The primary addition is a new location for the hook to be called when scrolling 
with the mouse-wheel.  A couple of pointers were added to store 
window/start-end values.  Miscellaneous unrelated new/experimental features 
have been removed from the patch.  The usage is as follows:


(defun window-start-end-hook-fn (win start end pbol-start peol-end fully-p)
  (message "win: %s | start: %s | end: %s | pbol-start: %s | peol-end: %s | 
fully-p: %s"
    win start end pbol-start peol-end fully-p))

(add-hook 'window-start-end-hook 'window-start-end-hook-fn nil t)

window_start_end_hook.diff
Description: application/diff