incorrect X11 display update

[Marko Mäkelä]

In GNU Emacs 21.3.2 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2003-04-24 on raven, modified by Debian
 configured using `configure  i386-linux --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes --with-x=yes
 --with-x-toolkit=athena --without-gif'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: C
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: C
  value of $LANG: fi_FI@euro
  locale-coding-system: iso-latin-9
  default-enable-multibyte-characters: nil

Emacs 21 has occasional problems with X11 display updates.  Last night,
I was able to reproduce one bug - alas, I don't know which font Emacs is
using, and this exact bug doesn't seem to appear with other fonts.
To reproduce, type m C-a m on an empty line.  The line should read "mm"
with the cursor above the second "m", but instead, it reads "_m", where
the "_" is a ghost image of the cursor.

A picture is worth 1000 words, or in this case 1000 bytes.
I've attached two screenshots in PNG format.

        Marko

emacs-m.png
Description: PNG image

emacs-mm.png
Description: PNG image