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Display problem with unusual tab width

From: Ueli Schl,bd(Bpfer
Subject: Display problem with unusual tab width
Date: Mon, 10 Dec 2001 21:55:23 +0100 (added by address@hidden)

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.1.1 (i586-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-11-12 on linux
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  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: de_CH.ISO-8859-1
  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:

The following actions reproduce the bug in my emacs:

- Loading the included test file (below, close enough to minimal ;-)
- Enable truncating of long lines
- Set the tab width to 32
- Go to the end of the line
- Make the emacs window wider (mine is 86x42 by default -- I think I
  don't have any emacs-related X resources loaded).  120x4 is a size
  that I've verified.
- Use the backspace key to erase a few characters

Deleting characters backwards from the end of the line supresses the
display of several characters near the end of the line.  They can be
displayed again by hitting C-l.

Thanks for the great work anyway!

- Ueli Schl=8e4pfer

---8< Testfile below
Xxxxxxx Xxxxxx  999 / 999 99 99 xx. Xxxxxxxxxx 99       Xxxxxxxx        XX-9999 
        99. Xxxx 9999   Xxxxx xxxx xx XXX
---8< Testfile above

Oh, in case this gets word wrapped: This is basically a line of
tab-separated fields of an adress list, all on one line.

Recent input:
C-x C-f W o <tab> A d r e <tab> - <tab> T e <tab> <return> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <menu-bar> <options> <truncate-lines> M-x 
e d <backspace> <backspace> s e t - v a r i a b l e 
<return> t a b - w i d t h <return> 3 2 <return> C-e 
<backspace> <backspace> C-l C-x u C-x u <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <menu-bar> <help-menu> <report-emacs-b

Recent messages:
(emacs -q -no-site-file)
Loading disp-table...done
Loading tool-bar...done
Loading image...done
Loading tooltip...done
For information about the GNU Project and its goals, type C-h C-p.
Long Line Truncation enabled
Undo! [2 times]
Loading emacsbug...done

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