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tab-width documentation: no mention of special handling of 0


From: Edward Welbourne
Subject: tab-width documentation: no mention of special handling of 0
Date: Wed, 16 Oct 2002 10:50:51 +0200

This bug report will be sent to the Free Software Foundation,
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Please write in English, because the Emacs maintainers do not have
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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:

The help on tab-width says: <quote>

tab-width's value is 0
Local in buffer *grep*; global value is 8

Documentation:
*Distance between tab stops (for display of tab characters), in columns.
Automatically becomes buffer-local when set in any fashion.

</quote> but, when tab-width is set to 0, the default, 8, gets used in
its place (quite sensible in its own way :^) rather than hiding all
tab characters. [I was using it on M-x grep-find's output so I could
read the code found without it mostly being off-screen to my right,
what with the long filenames being added before the often deep
indentation ... a tab-width of 1 does adequately, though.]

The documentation of tab-width should mention the special handling of
0; or 0 should really be handled the way the doc says it will be.

This is not a life-threatening, or even urgent, bug !

Recent input:
M-x M-p <return> M-p <return> 1 <return> M-x M-p <return> 
M-p <return> 0 <return> M-x M-p <return> M-p <return> 
1 <return> C-x 3 C-h v t a b - w i d t h <return> M-x 
M-p <return> M-p <return> 0 <return> C-n C-n C-n C-n 
C-M-f C-M-f C-M-f C-f C-f C-f C-f C-p C-b C-b C-b C-b 
C-b C-b C-b C-b C-n C-b C-f C-f M-x M-p <return> M-p 
<return> 1 <return> M-x M-p <return> M-p <return> 0 
<return> C-h v M-p <return> M-x M-p <return> M-p <return> 
1 <return> M-x r e p o <tab> r <tab> <return>

Recent messages:
Mark set [2 times]
Making completion list...
Mark saved where search started
Mark set
Mark saved where search started
Mark set [2 times]
Loading pp...done
Type C-x 4 b RET to restore the other window.  C-M-v to scroll the help.
Making completion list...
Loading emacsbug...done




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