M-x longlines on RMAIL file destroys format

[Ryan Yeske]

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Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list.

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

If you run M-x longlines while looking at a message in RMAIL and then
save the file all of the newlines will be stripped from the file.

***
DO NOT TEST THIS ON YOUR REAL RMAIL FILE!!!  YOU WILL LOSE MAIL!!!
***

What I did was output a single message with long lines to XMAIL.  Open
that file in rmail-mode, and turn on longlines mode with M-x
longlines.  Add a label or something to mark the buffer as changed,
and save with 's'.

Rmail will continue to operate on this file until you close Emacs and
restart (or kill the buffer and revisit it, probably).  Visit the file
literally and notice all the newlines have been stripped.  Rmail gets
confused looking at this file in subsequent visits.  There is no way I
know of to undo this.  If you know, please let me know, I have several
effectively lost messages in an RMAIL file that is broken in this way.

Perhaps adding hard-newlines to RMAIL files would solve the problem,
and then only the soft ones added by longlines will be removed.

If emacs crashed, and you have the emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/22.0.50/etc/DEBUG for instructions.


In GNU Emacs 22.0.50.6 (i386-unknown-openbsd3.6, X toolkit, Xaw3d scroll bars)
 of 2005-10-20 on cut.bc.hsia.telus.net
X server distributor `The XFree86 Project, Inc', version 11.0.40399902
configured using `configure '--libdir=/usr/local/lib' 
'LDFLAGS=-L/usr/local/lib' 'LD_LIBRARY_PATH=/usr/local/lib''

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: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tool-bar-mode: t
  mouse-wheel-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
C-u M-x r m a i l <return> X M A I L <return> h h h 
q M-x r e p o r t - e m a c s - b u g <return>

Recent messages:
Computing summary lines...done
Computing summary lines...
No preceding message
Computing summary lines...done
Computing summary lines...
No preceding message
Computing summary lines...done
Expunging deleted messages...done
(No changes need to be saved)
Loading emacsbug...done
From: Ryan Yeske <address@hidden>