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Emacs hangs if (display_width = line_width + 499) ...

From: Ulf Klaperski
Subject: Emacs hangs if (display_width = line_width + 499) ...
Date: Sat, 18 Jan 2003 00:08:25 +0100
User-agent: Mutt/1.3.28i

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: t

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


ok, I give up trying to find the bug myself. |-( 

I have a situation that makes emacs hang. I have attached a testcase file
(it's _really_ small!).

If you save the attached file 549.txt and start emacs with:

emacs -geometry 50x20 549.txt

Then press cursor-down twice... emacs hangs... just on leaving the long line.

Sometimes it recovers after a while. The problem seems that the actual
line is 499 chars longer than the visible. I noticed that emacs loops in
xdisp.c:redisplay_internal. Probably it's related to
"MAX_NEWLINE_DISTANCE = 500" in forward_to_next_line_start.

Hm, I think a really important setting is: truncate-lines: t

I saw the problem on Debian, SuSE and HP-sUX with emacs 21.2.



Attachment: 549.txt
Description: Text document

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