From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Scrolling commands and skipping redisplay, was: Re: emacs rendering comparisson between emacs23 and emacs26.3 Date: Fri, 17 Apr 2020 09:18:12 +0300 Message-ID: <83v9lyd49n.fsf@gnu.org> References: <20200403174757.GA8266@ACM> <83y2r9syby.fsf@gnu.org> <20200405195753.GG5049@ACM> <542b48ba-4dfa-820f-ba50-4b147ab6d8e2@yandex.ru> <0a5f70aa-4985-8f8d-81d6-6ac4a60a94f9@yandex.ru> <838sj8sphk.fsf@gnu.org> <834ktwsmfw.fsf@gnu.org> <83imibqsmm.fsf@gnu.org> <478c2aab-a5fc-61c2-02e2-2d9846b95273@yandex.ru> <83v9m9nltx.fsf@gnu.org> <83tv1rn8fx.fsf@gnu.org> <4f8bb277-b376-97bf-8539-799688d8e66d@yandex.ru> <83eesvmj15.fsf@gnu.org> <6eec7f68-770e-b3b1-4627-6222f3ef7216@yandex.ru> <83ftd9kwlu.fsf@gnu.org> <1de9d24f-eeb7-7d0a-3768-4baba4365066@yandex.ru> <83zhbcdmyi.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="93359"; mail-complaints-to="usenet@ciao.gmane.io" Cc: rms@gnu.org, emacs-devel@gnu.org, rudalics@gmx.at, rrandresf@gmail.com, dgutov@yandex.ru, acm@muc.de To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Apr 17 08:19:12 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jPKLI-000OB6-HP for ged-emacs-devel@m.gmane-mx.org; Fri, 17 Apr 2020 08:19:12 +0200 Original-Received: from localhost ([::1]:42828 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jPKLH-0001XK-HW for ged-emacs-devel@m.gmane-mx.org; Fri, 17 Apr 2020 02:19:11 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59380) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jPKKf-00010V-UE for emacs-devel@gnu.org; Fri, 17 Apr 2020 02:18:34 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:46273) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1jPKKf-0004w1-IB; Fri, 17 Apr 2020 02:18:33 -0400 Original-Received: from [176.228.60.248] (port=1283 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jPKKY-0007JK-3k; Fri, 17 Apr 2020 02:18:26 -0400 In-Reply-To: (message from Stefan Monnier on Thu, 16 Apr 2020 16:20:56 -0400) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:247148 Archived-At: > From: Stefan Monnier > Cc: Dmitry Gutov , acm@muc.de, rrandresf@gmail.com, > emacs-devel@gnu.org, rms@gnu.org, rudalics@gmx.at > Date: Thu, 16 Apr 2020 16:20:56 -0400 > > >> - Implementation-wise, not all commands simulate redisplay during their > >> operation. > > I think you will find that many more do than you seem to assume. Even > > just redisplaying a window does this in many cases (to find the proper > > place for window-start position). C-n and C-p do as well. > > char-based, word-based, and sexp-based motion doesn't. But line and > motion that depends on "visual size" indeed typically does. Also some functions that have nothing to do with movement, like posn-at-point. In a nutshell, any function that needs to consider layout, and any command that uses such functions. > > And when scroll-conservatively is in effect, almost every command that > > moves point does. > > Really? I thought `scroll-conservatively` only affects the redisplay > code and not the execution of "normal" commands (i.e. commands which > don't themselves rely on simulating redisplay). Like I said: redisplay itself calls those functions internally in many situations, and scroll-conservatively > 100 makes it use that much more. When I said above "almost every command", I meant redisplay triggered after commands that move point.