From mboxrd@z Thu Jan  1 00:00:00 1970
Path: main.gmane.org!not-for-mail
From: Juanma Barranquero <lektu@terra.es>
Newsgroups: gmane.emacs.devel
Subject: force-mode-line-update in post-command-hook renders scroll-conservatively worthless
Date: Mon, 15 Jul 2002 13:30:53 +0200
Sender: emacs-devel-admin@gnu.org
Message-ID: <20020715132426.69FB.LEKTU@terra.es>
NNTP-Posting-Host: localhost.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
X-Trace: main.gmane.org 1026733699 5384 127.0.0.1 (15 Jul 2002 11:48:19 GMT)
X-Complaints-To: usenet@main.gmane.org
NNTP-Posting-Date: Mon, 15 Jul 2002 11:48:19 +0000 (UTC)
Return-path: <emacs-devel-admin@gnu.org>
Original-Received: from quimby.gnus.org ([80.91.224.244])
	by main.gmane.org with esmtp (Exim 3.33 #1 (Debian))
	id 17U4Kw-0001Oj-00
	for <emacs-devel@main.gmane.org>; Mon, 15 Jul 2002 13:48:18 +0200
Original-Received: from fencepost.gnu.org ([199.232.76.164])
	by quimby.gnus.org with esmtp (Exim 3.12 #1 (Debian))
	id 17U4VN-0005Mf-00
	for <emacs-devel@quimby.gnus.org>; Mon, 15 Jul 2002 13:59:05 +0200
Original-Received: from localhost ([127.0.0.1] helo=fencepost.gnu.org)
	by fencepost.gnu.org with esmtp (Exim 3.35 #1 (Debian))
	id 17U44Y-0001br-00; Mon, 15 Jul 2002 07:31:22 -0400
Original-Received: from [62.22.27.141] (helo=mail.peoplecall.com)
	by fencepost.gnu.org with esmtp (Exim 3.35 #1 (Debian))
	id 17U447-0001bJ-00
	for <emacs-devel@gnu.org>; Mon, 15 Jul 2002 07:30:55 -0400
Original-Received: from [62.22.27.143] (jbarranquero.ofi.peoplecall.com [62.22.27.143])
	by mail.peoplecall.com (8.11.6/8.11.6) with ESMTP id g6FBUrM28370
	for <emacs-devel@gnu.org>; Mon, 15 Jul 2002 13:30:53 +0200
Original-To: emacs-devel@gnu.org
X-Mailer: Becky! ver. 2.05.03
Errors-To: emacs-devel-admin@gnu.org
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.0.11
Precedence: bulk
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Post: <mailto:emacs-devel@gnu.org>
List-Subscribe: <http://mail.gnu.org/mailman/listinfo/emacs-devel>,
	<mailto:emacs-devel-request@gnu.org?subject=subscribe>
List-Id: Emacs development discussions. <emacs-devel.gnu.org>
List-Unsubscribe: <http://mail.gnu.org/mailman/listinfo/emacs-devel>,
	<mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://mail.gnu.org/pipermail/emacs-devel/>
Xref: main.gmane.org gmane.emacs.devel:5758
X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:5758

emacs -q --no-site-file
M-x set-variable scroll-conservatively 1000000
C-x C-n
<down>...                ; Scrolls one line at a time
M-x ruler-mode
<down>...                ; Cursor jumps to the middle of screen
                         ; while scrolling the window

The reason is not ruler-mode, but the fact that it does:

(add-hook 'post-command-hook #'force-mode-line-update nil t)

AFAICS, adding `force-mode-line-update' (or in fact any function that
calls `set-buffer-modified-p') to post-command-hook makes
`scroll-conservatively' useless in all 21.X releases. It worked fine in
20.7.


                                                           /L/e/k/t/u