LaTeX: fill-paragraph is not stable with \\

[Akim Demaille]

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In GNU Emacs 21.3.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2004-04-07 on raven, modified by Debian
configured using `configure '--build=i386-linux' '--host=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' 'CFLAGS=-DDEBIAN -g -O2' 'build_alias=i386-linux' 
'host_alias=i386-linux''
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: fr_FR
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

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

Hi!

There is a small problem when using M-q (fill-paragraph) for LaTeX
documents: paragraphs with an embedded \\ ``move'' when you refill
them.  Just try a simple

hello\\
world

in LaTeX, and see the added newline before the paragraph each time you
refill it.

       Thanks!


PS/ I'm using AUC-TeX, but I couldn't track the actual code used by
fill-paragraph.


Recent input:
m a c s <tab> s u b <tab> <backspace> <backspace> <backspace> 
<tab> <M-backspace> s u b <tab> <backspace> <backspace> 
<backspace> g n u <tab> <M-backspace> <tab> <help-echo> 
<down-mouse-1> <mouse-movement> <mouse-1> C-s b u g 
C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s - r e p C-s 
C-s C-s C-s C-s C-s C-s C-s C-x 1 <C-home> C-s e m 
a c s C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s <up> 
q <up> C-x k <return> C-x k <return> C-x k <return> 
M-x r e p o r t <tab> e m <tab> <return>

Recent messages:
Ispell process killed
(Next Ispell command will use default dictionary)
Starting new Ispell process...
Making completion list... [2 times]
call-interactively: Buffer is read-only: #<buffer *Completions*>
call-interactively: Command attempted to use minibuffer while in minibuffer
recursive-edit: Buffer is read-only: #<buffer filladapt.el>
Ispell process killed
(Next local Ispell command will use american dictionary)
Starting new Ispell process...