From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#23861: 25.1.50; fast-but-imprecise-scrolling: What does "somewhat inaccurate" mean? Date: Tue, 28 Jun 2016 19:14:58 +0300 Message-ID: <8337nxxpbx.fsf@gnu.org> References: <20160615222015.GA4813@acm.fritz.box> <5770C84E.30208@gmx.at> <83h9cey4t3.fsf@gnu.org> <57715AE5.3030109@gmx.at> <83furyxwc1.fsf@gnu.org> <577233F8.3000603@gmx.at> <20160628091811.GA3181@acm.fritz.box> <57727584.3060502@orcon.net.nz> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1467131065 14730 80.91.229.3 (28 Jun 2016 16:24:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 28 Jun 2016 16:24:25 +0000 (UTC) Cc: 23861@debbugs.gnu.org To: Phil Sainty Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Jun 28 18:24:12 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bHvnw-0002io-Jv for geb-bug-gnu-emacs@m.gmane.org; Tue, 28 Jun 2016 18:24:04 +0200 Original-Received: from localhost ([::1]:38038 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bHvns-00088u-Ja for geb-bug-gnu-emacs@m.gmane.org; Tue, 28 Jun 2016 12:24:00 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34165) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bHvgE-0005xh-8X for bug-gnu-emacs@gnu.org; Tue, 28 Jun 2016 12:16:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bHvgA-0004fM-1J for bug-gnu-emacs@gnu.org; Tue, 28 Jun 2016 12:16:05 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:46926) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bHvg9-0004fH-Te for bug-gnu-emacs@gnu.org; Tue, 28 Jun 2016 12:16:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1bHvg9-0001mJ-Q9 for bug-gnu-emacs@gnu.org; Tue, 28 Jun 2016 12:16:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 28 Jun 2016 16:16:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 23861 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 23861-submit@debbugs.gnu.org id=B23861.14671305326795 (code B ref 23861); Tue, 28 Jun 2016 16:16:01 +0000 Original-Received: (at 23861) by debbugs.gnu.org; 28 Jun 2016 16:15:32 +0000 Original-Received: from localhost ([127.0.0.1]:59263 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bHvfg-0001lX-Ex for submit@debbugs.gnu.org; Tue, 28 Jun 2016 12:15:32 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:42832) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bHvff-0001lL-Or for 23861@debbugs.gnu.org; Tue, 28 Jun 2016 12:15:32 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bHvfX-0004TJ-DK for 23861@debbugs.gnu.org; Tue, 28 Jun 2016 12:15:26 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:57311) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bHvfX-0004T4-AR; Tue, 28 Jun 2016 12:15:23 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4386 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1bHvfV-0001BJ-Ek; Tue, 28 Jun 2016 12:15:21 -0400 In-reply-to: <57727584.3060502@orcon.net.nz> (message from Phil Sainty on Wed, 29 Jun 2016 01:03:00 +1200) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:120181 Archived-At: > From: Phil Sainty > Date: Wed, 29 Jun 2016 01:03:00 +1200 > > It's unclear to me what the following excerpt from the docstring > for the `fast-but-imprecise-scrolling' variable actually means: > > > Note that this optimization can cause the portion of the buffer > > displayed after a scrolling operation to be somewhat inaccurate. > > "somewhat inaccurate" is incredibly vague if you don't already > know what it means. It means that what's on the screen might not reflect what's in the buffer. It's hard to tell anything more specific, since which redisplay optimizations will be taken in each case depends on many factors on which the user has no control. > Does it mean that the position scrolled to might be further (or > less far) than it would have been otherwise? It could. > Does it mean that the font-locking may be incomplete or incorrect? It could. > Does it mean that the buffer text may appear corrupted?! It could, if faces change the font size.