From: "Juanma Barranquero" <[email-masked]>
Date: Thu, 20 Nov 2008 10:25:03 +0100

Fixed by Chong Yidong with this change:

2008-10-27  Chong Yidong  <[email-masked]>

        * xdisp.c (try_scrolling): When computing the distance from the
        scroll margin to PT, try moving some distance past the window
        bottom before giving up.

http://cvs.savannah.gnu.org/viewvc/emacs/emacs/src/xdisp.c?r1=1.1268&r2=1.1269&pathrev=MAIN