bad coloring in shell script mode

[Joe Corneli]

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In GNU Emacs 21.2.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-03-22 on raven, modified by Debian
configured using `configure  i386-debian-linux-gnu --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: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

This line

    grep "<<$SF>>" $HOME/.todo/$TODOLIST > $HOME/p

causes everything after it to be in Sh Heredoc Face....
well, everything until a similar line is encountered
later on in the code, then normal fontlock behaviour begins
again.

Specifically, the line

   grep -v "<\*>" $HOME/.todo/$TODOLIST | grep "<<.*>>" - > $HOME/b

turns font lock back on.

The intervening line

   sed -e "s/^\($SF:\)\(.*<<\)\(.*\)\(>>\)$/\3/"`

doesn't have any effect.

Note that this behaviour is not present in XEmacs 21.5.

Recent input:
RET C-s r a t p o i C-s C-s C-s C-s C-s C-s C-s C-s 
ESC s C-x o C-s C-g ESC O B ESC O B C-s r e p o r t 
C-s C-s C-s C-s C-s ESC O D ESC x r e p o r t - e m 
a c s - b u g RET b a d SPC c o l o r i n g SPC i n 
C-x o C-x C-f C-g C-x C-f t o d o RET ESC x r e p TAB 
o TAB r TAB RET

Recent messages:
Loading rxvt (source)...done
Loading /home/jcorneli/.emacs.elc...done
ratpoison: command not found
isearch-abort: Quit
Mark saved where search started
Loading emacsbug...done
ratpoison: command not found
byte-code: Command attempted to use minibuffer while in minibuffer
keyboard-quit: Quit
Making completion list... [2 times]