GNU bug report logs - #9607
incorrect behavior with "automatic-hscroll-mode nil" in ncurses/vt220 text operation; wrong in 23 but ok in 22.1

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#9607: closed (incorrect behavior with "automatic-hscroll-mode
 nil" in ncurses/vt220 text operation; wrong in 23 but ok in 22.1)
Date: Thu, 29 Sep 2011 13:08:01 +0000

[Message part 1 (text/plain, inline)]

Your message dated Thu, 29 Sep 2011 16:06:13 +0300
with message-id <83oby3ebwa.fsf <at> gnu.org>
and subject line Re: bug#9607: incorrect behavior with "auto-hscroll-mode nil" in	ncurses/vt220 text operation; wrong in 23 but ok in 22.1
has caused the debbugs.gnu.org bug report #9607,
regarding incorrect behavior with "automatic-hscroll-mode nil" in ncurses/vt220 text operation; wrong in 23 but ok in 22.1
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
9607: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9607
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: David Lawless <david_lawless <at> flumedata.com>
To: bug-gnu-emacs <at> gnu.org
Subject: incorrect behavior with "automatic-hscroll-mode nil" in ncurses/vt220
	text operation; wrong in 23 but ok in 22.1
Date: Mon, 26 Sep 2011 17:19:05 -0400

have "(setq automatic-hscroll-mode nil)" in .emacs file

edit wide output of file copied from /proc/interrupts
(machine has 12 cores)

place cursor at around column 12, then scroll out
to left view with "scroll-left" so ends-of-lines
appear in middle of windows, then from mapped
key issue "next-line" twice

first time it behaves correctly, second time
display scrolls horizontally so cursor is visible,
which it should not do

was upgrading from 20.5a to 23.3a when noticed
this; went back to 22.1 and it works ok


In GNU Emacs 22.1.1 (x86_64-unknown-linux-gnu)
 of 2011-09-26 on siobhan
configured using `configure  '--without-x''

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

Major mode: Lisp Interaction

Minor modes in effect:
  file-name-shadow-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
ESC x TAB C-g ESC x r e p TAB o TAB DEL o t TAB DEL 
r TAB C-j

Recent messages:
("emacs")
Loading hi-lock...done
Loading cc-mode...done
Loading make-mode...done
Making completion list...
Loading help-mode...done
Quit [2 times]
Making completion list... [2 times]
Loading emacsbug...done

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From: Eli Zaretskii <eliz <at> gnu.org>
To: rgm <at> gnu.org, 9607-done <at> debbugs.gnu.org, david_lawless <at> flumedata.com
Subject: Re: bug#9607: incorrect behavior with "auto-hscroll-mode nil"
	in	ncurses/vt220 text operation; wrong in 23 but ok in 22.1
Date: Thu, 29 Sep 2011 16:06:13 +0300

> Date: Tue, 27 Sep 2011 02:07:20 -0400
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 9607 <at> debbugs.gnu.org, david_lawless <at> flumedata.com
> 
> The problem is that line-move-visual assumes that the move begins with
> cursor positioned at point, which is false when auto-hscroll-mode is
> turned off and point is scrolled out of view.
> 
> Before I dive into this mess (again), do we even want to support
> auto-hscroll-mode nil _and_ visual line movement?  What if we tell
> line-move to invoke logical line movement instead when
> auto-hscroll-mode is off?  Would someone object?

No one objected, so I fixed this in revision 105959 on the trunk by
disabling visual line movement when auto-hscroll-mode is disable and
the window is hscrolled.

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