[Bug: 21.4.18] Bigger fonts overwrite the modeline in split windows

[Markus.Grunwald at pruftechnik.com]

Dear Bug Team!

To reproduce the bug:

- M-x split-window-vertically
- Create some enriched text with one line bigger then the rest in the 
lower window
- Scroll down so far that the bigger line leaves the lower screen
- The bigger lines overwrites the modeline

I attached two pictures to show the effect.

Mit freundlichen Grüßen

Markus Grunwald
Softwareentwicklung

PRÜFTECHNIK Condition Monitoring GmbH
Oskar-Messter-Straße 19-21
85737 Ismaning
www.pruftechnik.com
Tel: +49 (0)89 99616177
Fax: +49 (0)89 99616200


================================================================

System Info to help track down your bug:
---------------------------------------

uname -a: Linux penell 2.6.15 #1 Fri Jan 13 21:35:48 JST 2006 i686 
GNU/Linux

./configure  '--with-sound=none,native' '--with-x11' '--extra-verbose' 
'--with-site-lisp' '--with-database=berkdb' '--statedir=/var/lib' 
'--infodir=/usr/share/info/xemacs21' '--infopath=/usr/share/info/xemacs21' 
'--prefix=/usr' '--dynamic' '--error-checking=none' '--debug=no' 
'--with-pop' '--with-file-coding' '--pdump' '--with-system-malloc' 
'--with_menubars=lucid' '--with_scrollbars=lucid' '--with_dialogs=athena' 
'--docdir=/usr/lib/xemacs-21.4.18/i386-debian-linux/mule/' '--with-mule' 
'--with-canna=no' '--with-wnn=no' '--with-xim=xlib' '--with-xfs' 
'--package-path=~/.xemacs:~/.xemacs/packages:~/.xemacs/xemacs-packages::/usr/share/xemacs21/site-packages:/usr/share/xemacs21/mule-packages:/usr/share/xemacs21/xemacs-packages' 
'i386-debian-linux'


XEmacs 21.4.18 "Social Property" configured for `i386-debian-linux'.


Compilation / Installation:
  Source code location: /home/mohura/packages/build-area/xemacs21-21.4.18
  Installation prefix:               /usr
  Operating system description file: `s/linux.h'
  Machine description file:          `m/intel386.h'
  Compiler:                          gcc -g -O3 -Wall -Wno-switch -Winline 
-Wmissing-prototypes -Wsign-compare -fno-strict-aliasing -Wshadow
  Compiler version:                  gcc (GCC) 4.0.3 20060115 (prerelease) 
(Debian 4.0.2-7)
  Compiler specs file:               specs.
  Relocating allocator for buffers:  no
  GNU version of malloc:             no
    - User chose not to use GNU allocators.
Need to guess glibc1/2/etc here

Window System:
  Compiling in support for the X window system:
    - X Windows headers location:                 /usr/X11R6/include
    - X Windows libraries location:               /usr/X11R6/lib
    - Handling WM_COMMAND properly.
  Compiling in support for the Athena widget set:
    - Athena headers location:                    X11/Xaw
    - Athena library to link:                     Xaw
  Using Lucid menubars.
  Using Lucid scrollbars.
  Using Athena dialog boxes.
  Using Athena native widgets.

TTY:
  Compiling in support for ncurses.
  Compiling in support for GPM (General Purpose Mouse).

Images:
  Compiling in support for GIF  images (builtin).
  Compiling in support for XPM  images.
  Compiling in support for PNG  images.
  Compiling in support for JPEG images.
  Compiling in support for TIFF images.
  Compiling in support for X-Face message headers.

Sound:
  Compiling in support for sound (native).

Databases:
  Compiling in support for Berkeley database.
  Compiling in support for LDAP.

Internationalization:
  Compiling in support for Mule (multi-lingual Emacs).
  Compiling in support for file coding.
  Compiling in support for XIM (X11R5+ I18N input method).
    - Using raw Xlib to provide XIM support.
    - Using XFontSet to provide bilingual menubar.

Mail:
  Compiling in support for POP mail retrieval.
  Compiling in support for "dot-locking" mail spool file locking method.

Other Features:

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