bug#14819: Scrolling page up-page down with scroll bar does not work

[Eli Zaretskii]

> Date: Mon, 08 Jul 2013 15:08:11 +0200
> From: Angelo Graziosi <angelo.graziosi@alice.it>
> 
> To reproduce:

In what version of Emacs?  (Why not use 'report-emacs-bug'?)

> $ emacs -Q &
> C-x C-f A_LONG_TEXT_FILE
> 
> The scroll bar is on the right and it has an UP arrow and a DOWN arrow. 
> Clicking with mouse-1 on these arrows, scrolls the buffer one line at 
> time (up or down), and this is OK.
> 
> Now, clicking just above the DOWN arrow or just below the UP arrow 
> should scroll the buffer a *page* at time (down or up), instead it only 
> moves the scroll bar cursor.. :-(

Works as expected for me in the w32 build of yesterday's trunk.