mwheel-scroll causes bogus redisplay with Bitstream Vera Sans

[Eric Hanchrow]

I'm using Debian Sarge, and I've installed the "ttf-bitstream-vera" package.

I start Emacs with 

        emacs -Q /usr/share/dict/words -fn '-*-Bitstream Vera Sans 
Mono-Medium-r-*-*-18-*-*-*-*-*-*-*'

Then I move point to the bottom of the window with M-- M-r.  Now I
roll the mouse wheel away from me, to attempt to scroll backwards.  As
expected, I get an Emacs error: "Beginning of Buffer".  However, the
window has recentered, with point now in the middle of the window --
in other words, the window has scrolled _forwards_ half a screen.

This doesn't happen if I don't pass a font name on the command line.

In GNU Emacs 22.0.50.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2006-01-29 on debian
X server distributor `The XFree86 Project, Inc', version 11.0.40300001
configured using `configure '--enable-maintainer-mode''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  auto-compression-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
<double-mouse-4> <down-mouse-4> <mouse-4> <down-mouse-4> 
<mouse-4> <double-down-mouse-4> <double-mouse-4> <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<down-mouse-4> <mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
M-< C-u C-u C-n C-u C-n C-u C-n C-u C-n C-u C-n C-u 
C-n C-p <down-mouse-4> <mouse-4> <down-mouse-4> <mouse-4> 
<down-mouse-4> <mouse-4> M-< M-- M-r <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <down-mouse-4> <mouse-4> M-< M-- M-r 
<down-mouse-4> <mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <down-mouse-1> 
<mouse-1> <S-down-mouse-1> M-< M-- M-r <down-mouse-4> 
<mouse-4> <double-down-mouse-4> <double-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
M-x r e p o r t - e m <tab> <return>

Recent messages:
mwheel-scroll: Beginning of buffer [3 times]
Mark set
mwheel-scroll: Beginning of buffer [3 times]
Mark set
mwheel-scroll: Beginning of buffer [2 times]
Mark set
mwheel-scroll: Beginning of buffer [4 times]
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