From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Chad Brown Newsgroups: gmane.emacs.devel Subject: Re: The unwarranted scrolling assumption Date: Tue, 15 Jun 2010 17:29:11 -0700 Message-ID: References: <87ocfcj7r4.fsf@mail.jurta.org> <87631jvpzg.fsf@gmail.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 (Apple Message framework v1078) Content-Type: multipart/alternative; boundary=Apple-Mail-9--159275697 X-Trace: dough.gmane.org 1276648172 877 80.91.229.12 (16 Jun 2010 00:29:32 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 16 Jun 2010 00:29:32 +0000 (UTC) Cc: Juanma Barranquero , Sean Sieger , emacs-devel@gnu.org To: Lennart Borgman Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Jun 16 02:29:30 2010 connect(): No such file or directory Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1OOgVS-0001e0-3R for ged-emacs-devel@m.gmane.org; Wed, 16 Jun 2010 02:29:26 +0200 Original-Received: from localhost ([127.0.0.1]:59820 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OOgVR-0001Iu-C4 for ged-emacs-devel@m.gmane.org; Tue, 15 Jun 2010 20:29:25 -0400 Original-Received: from [140.186.70.92] (port=49501 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OOgVJ-0001IP-9j for emacs-devel@gnu.org; Tue, 15 Jun 2010 20:29:18 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OOgVI-0007oI-2e for emacs-devel@gnu.org; Tue, 15 Jun 2010 20:29:17 -0400 Original-Received: from dmz-mailsec-scanner-7.mit.edu ([18.7.68.36]:51591) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OOgVI-0007o6-0z for emacs-devel@gnu.org; Tue, 15 Jun 2010 20:29:16 -0400 X-AuditID: 12074424-b7c30ae000000a22-4b-4c181adbc5e9 Original-Received: from mailhub-auth-1.mit.edu (MAILHUB-AUTH-1.MIT.EDU [18.9.21.35]) by dmz-mailsec-scanner-7.mit.edu (Symantec Brightmail Gateway) with SMTP id AA.8B.02594.BDA181C4; Tue, 15 Jun 2010 20:29:15 -0400 (EDT) Original-Received: from outgoing.mit.edu (OUTGOING-AUTH.MIT.EDU [18.7.22.103]) by mailhub-auth-1.mit.edu (8.13.8/8.9.2) with ESMTP id o5G0TE5U006367; Tue, 15 Jun 2010 20:29:15 -0400 Original-Received: from [10.0.1.5] (c-98-247-149-76.hsd1.wa.comcast.net [98.247.149.76]) (authenticated bits=0) (User authenticated as yandros@ATHENA.MIT.EDU) by outgoing.mit.edu (8.13.6/8.12.4) with ESMTP id o5G0TBNp029585 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Tue, 15 Jun 2010 20:29:13 -0400 (EDT) In-Reply-To: X-Mailer: Apple Mail (2.1078) X-Brightmail-Tracker: AAAAARS+x8E= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:125983 Archived-At: --Apple-Mail-9--159275697 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Jun 15, 2010, at 4:59 PM, Lennart Borgman wrote: >=20 > All I do to check this is open window.c and then hit/hold down the > down arrow key (or "j" in viper). >=20 > Does this work without "jumping scrolling" for you? (You have to test > for a while, the jumping does not happen always. I is a bit like > playing a computer game.) This can be a function of computer speed -- the settings make emacs try = to keep up the scrolling, but if the cursor motion gets ahead of the = scrolling, it chooses to jump-scroll rather than silently eating the = scrolling. Caveat: this is my `basic' understanding; I haven't tested exactly these = settings. What would you like Emacs to do, conceptually, if you move down lines = faster than the display engine can redraw them? I assume `scroll less' = and `error' are both obvious non-starters, so I'm guessing that you = would want emacs to remain syncronous, even if it meant being = unresponsive in a scroll-redraw-repeat loop; is that correct? *Chad= --Apple-Mail-9--159275697 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii

All I do to = check this is open window.c and then hit/hold down the
down arrow key = (or "j" in viper).

Does this work without "jumping scrolling" for = you? (You have to test
for a while, the jumping does not happen = always. I is a bit like
playing a computer game.)

This= can be a function of computer speed -- the settings make emacs try to = keep up the scrolling, but if the cursor motion gets ahead of the = scrolling, it chooses to jump-scroll rather than silently eating the = scrolling.

Caveat: this is my `basic' = understanding; I haven't tested exactly these = settings.

What would you like Emacs to do, = conceptually, if you move down lines faster than the display engine can = redraw them?  I assume `scroll less' and `error' are both obvious = non-starters, so I'm guessing that you would want emacs to remain = syncronous, even if it meant being unresponsive in a = scroll-redraw-repeat loop; is that = correct?

*Chad
= --Apple-Mail-9--159275697--