bug#632: 23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines

bug#632: 23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines

[Lawrence Mitchell]

If a buffer with `truncate-lines' set to t is put in
visual-line-mode and subsequently visual-line-mode is turned off,
the value of truncate-lines is lost (it is set to the default value).

Steps to reproduce:

1) emacs -Q
2) evaluate

(progn
  (switch-to-buffer (generate-new-buffer "bug"))
  (setq truncate-partial-width-windows nil)
  (setq-default truncate-lines nil)
  (setq truncate-lines t)
  (insert (make-string (+ (window-width) 10) ?a))
  (goto-char (point-min))
  (visual-line-mode -1))

Expected result:
truncate-lines is t in the buffer "bug"

Actual result:
truncate-lines is nil (the default value).

In GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-07-24 on lamacq.ph.ed.ac.uk
Windowing system distributor `The X.Org Foundation', version 11.0.60802000
configured using `configure  '-C' '--prefix=/scratch/s0198183/applications/emacs-trunk/' 'CFLAGS=-ggdb3 -O0''

Cheers,
Lawrence

-- 
Lawrence Mitchell <wence@gmx.li>

bug#632: marked as done (23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines)

[Emacs bug Tracking System]

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Your message dated Tue, 12 Aug 2008 15:41:12 -0400
with message-id <87d4ket413.fsf@stupidchicken.com>
and subject line Re: 23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines
has caused the Emacs bug report #632,
regarding 23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

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-- 
632: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=632
Emacs Bug Tracking System
Contact don@donarmstrong.com with problems

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From: Lawrence Mitchell <wence@gmx.li>
To: emacs-pretest-bug@gnu.org
Subject: 23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines
Date: Wed, 30 Jul 2008 16:18:51 +0100
Message-ID: <20080730151851.GB17404@lamacq.ph.ed.ac.uk>

If a buffer with `truncate-lines' set to t is put in
visual-line-mode and subsequently visual-line-mode is turned off,
the value of truncate-lines is lost (it is set to the default value).

Steps to reproduce:

1) emacs -Q
2) evaluate

(progn
  (switch-to-buffer (generate-new-buffer "bug"))
  (setq truncate-partial-width-windows nil)
  (setq-default truncate-lines nil)
  (setq truncate-lines t)
  (insert (make-string (+ (window-width) 10) ?a))
  (goto-char (point-min))
  (visual-line-mode -1))

Expected result:
truncate-lines is t in the buffer "bug"

Actual result:
truncate-lines is nil (the default value).

In GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-07-24 on lamacq.ph.ed.ac.uk
Windowing system distributor `The X.Org Foundation', version 11.0.60802000
configured using `configure  '-C' '--prefix=/scratch/s0198183/applications/emacs-trunk/' 'CFLAGS=-ggdb3 -O0''

Cheers,
Lawrence

-- 
Lawrence Mitchell <wence@gmx.li>



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From: Chong Yidong <cyd@stupidchicken.com>
To: Lawrence Mitchell <wence@gmx.li>
Cc: 632-done@emacsbugs.donarmstrong.com
Subject: Re: 23.0.60; Turning off visual-line-mode ignores previous value of truncate-lines
Date: Tue, 12 Aug 2008 15:41:12 -0400
Message-ID: <87d4ket413.fsf@stupidchicken.com>

> If a buffer with `truncate-lines' set to t is put in visual-line-mode
> and subsequently visual-line-mode is turned off, the value of
> truncate-lines is lost (it is set to the default value).

I've checked in a fix.  Thanks.