GNU bug report logs - #14508
scroll-conservatively==1 not honored for fast line by line navigation up

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Barry OReilly <gundaetiapo <at> gmail.com>
Subject: bug#14508: closed (scroll-conservatively==1 not honored for fast
 line by line navigation up)
Date: Thu, 13 Feb 2014 20:18:03 +0000

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Your bug report

#14508: scroll-conservatively==1 not honored for fast line by line navigation up

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 14508 <at> debbugs.gnu.org.

-- 
14508: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=14508
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Barry OReilly <gundaetiapo <at> gmail.com>
To: 14508-done <at> debbugs.gnu.org
Subject: scroll-conservatively==1 not honored for fast line by line navigation
 up
Date: Thu, 13 Feb 2014 15:17:00 -0500

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I ended up settling on settings:

 '(font-lock-maximum-decoration (quote ((c++-mode . 2))))
 '(scroll-conservatively 101)
 '(scroll-margin 4)

and in the C++ mode hook:

  (setq jit-lock-defer-time 0.01)

So I am able to scroll through C++ buffers with timely redisplays and
without recenterings. Closing.

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From: Barry OReilly <gundaetiapo <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: scroll-conservatively==1 not honored for fast line by line navigation
	up
Date: Wed, 29 May 2013 18:58:33 -0400

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Let /tmp/scroll-conservatively-1.el have this content:

  (setq scroll-conservatively 1)
  (add-hook 'term-setup-hook (lambda () (goto-char (point-max))))

And /tmp/foo.cpp as attached.

Also set the keyboard repitition rate somewhat high.

Start Emacs by: emacs -Q /tmp/foo.cpp --load /tmp/scroll-conservatively-1.el

Hold arrow up key, recentering occurs while scrolling up.

Note: Script goes to EOB because I only witness this for scroll ups, not
scroll downs.

I witness this regularly when navigating C++ source code.

----

In GNU Emacs 24.3.50.6 (x86_64-unknown-linux-gnu, GTK+ Version 2.10.4)
 of 2013-05-23 on redacted
Windowing system distributor `The X.Org Foundation', version 11.0.70101000
System Description:    Red Hat Enterprise Linux Client release 5.4 (Tikanga)

Configured using:
 `configure --prefix=/redacted/user/boreilly/sw/emacs-install-trunk
 --with-gif=no'

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: C++/l

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
M-x r e p o r t - e m a c <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
foo.cpp has auto save data; consider M-x recover-this-file
Loading cc-langs...done

Load-path shadows:
None found.

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[foo.cpp (text/x-c++src, attachment)]

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