From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Slow redisplay with long lines Date: Fri, 16 May 2014 08:40:39 +0300 Message-ID: <83ha4qmgbs.fsf@gnu.org> References: <83mwein6w1.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1400218867 23526 80.91.229.3 (16 May 2014 05:41:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 16 May 2014 05:41:07 +0000 (UTC) Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Stephan Mueller Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri May 16 07:40:58 2014 Return-path: Envelope-to: ged-emacs-devel@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 1WlAt7-0007OS-NO for ged-emacs-devel@m.gmane.org; Fri, 16 May 2014 07:40:57 +0200 Original-Received: from localhost ([::1]:33465 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WlAt7-000278-CO for ged-emacs-devel@m.gmane.org; Fri, 16 May 2014 01:40:57 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:43353) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WlAsx-00025e-Bx for emacs-devel@gnu.org; Fri, 16 May 2014 01:40:54 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WlAsp-0000nQ-TB for emacs-devel@gnu.org; Fri, 16 May 2014 01:40:47 -0400 Original-Received: from mtaout25.012.net.il ([80.179.55.181]:47642) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WlAsp-0000mU-KN for emacs-devel@gnu.org; Fri, 16 May 2014 01:40:39 -0400 Original-Received: from conversion-daemon.mtaout25.012.net.il by mtaout25.012.net.il (HyperSendmail v2007.08) id <0N5N00J00JHF3S00@mtaout25.012.net.il> for emacs-devel@gnu.org; Fri, 16 May 2014 08:37:42 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout25.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N5N00H1GJMTLB20@mtaout25.012.net.il>; Fri, 16 May 2014 08:37:42 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 80.179.55.181 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:171870 Archived-At: > From: Stephan Mueller > Date: Thu, 15 May 2014 20:57:08 +0000 > > " > Long lines slow down redisplay because it needs to scan the entire > " > line to see how tall it will be on display. > " > " Why should it care about the whole line rather than only the part > " of it that's displayed? > > So that the line height doesn't change when scrolling horizontally > and a taller character comes into view? No, horizontal scrolling causes another redisplay, which examines the characters that came into view at that time.