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bug#6738: possible bug in fill-paragraph


From: Eric De Mund
Subject: bug#6738: possible bug in fill-paragraph
Date: Tue, 27 Jul 2010 01:10:37 -0700

Hello,

Here's a possible bug in fill-paragraph. In my twenty years of using
Emacs (and fill-paragraph), I've never come across something like this.

In addition to observing this bug with:
    In GNU Emacs 22.2.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
    of 2008-11-09 on raven, modified by Debian
running under:
    Debian 5.0.5 Lenny
, I've reproduced it with:
    GNU Emacs 23.2.1 (i386-mingw-nt5.1.2600) of 2010-05-08 on G41R2F1
running under:
    Windows XP Professional
    Build 2600.xpsp_sp3_gdr.100216-1514 (Service Pack 3)    

Here are the gory details:

--------CUT HERE----BEGIN SECTION 1 OF 2--------

0. Invoke Emacs with "emacs -nw -q"

1. Start with this 3-line paragraph:

A former executive testified that David H. Brooks misused company
funds to buy a belt buckle encrusted with rubies, pornographic videos
for his son and prostitutes for his workers.

2. Invoke << C-u 20 C-x f >> with cursor positioned on first word "A".

3. Invoke << M-1 M-q >>.

4. Observe paragraph reformatted to this, incorrectly:

A  former  executive
testified that David
H.   Brooks  misused
company funds to buy
a     belt    buckle
encrusted        with
rubies, pornographic
videos  for  his son
and  prostitutes for
his workers.

i.e. with the 6th line ("encrusted        with") taking up 21 columns
rather than 20 columns.

--------CUT HERE----BEGIN SECTION 2 OF 2--------

In GNU Emacs 22.2.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2008-11-09 on raven, modified by Debian
configured using `configure '--build=i486-linux-gnu'
'--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var/lib'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs22:\
/etc/emacs:/usr/local/share/emacs/22.2/site-lisp:\
/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.2/site-lisp:\
/usr/share/emacs/site-lisp:/usr/share/emacs/22.2/leim'
'--with-x=yes' '--with-x-toolkit=athena' '--with-toolkit-scroll-bars'
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu'
'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

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: en_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  encoded-kbd-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
ESC x r e p o r t - e m a c s - b u g RET

Recent messages:
Loading debian-ispell...
Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...done
Loading debian-ispell...done
Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...done
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading emacsbug...
/usr/bin/mail is not an executable.  Setting mail-interactive to t.
Loading regexp-opt...done
Loading emacsbug...done

--------CUT HERE----END SECTION 2 OF 2--------

If you need more information, please don't hesitate to ask.

Regards,
Eric
--
Eric De Mund
address@hidden





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