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: Mon, 20 Apr 2020 20:39:43 +0300 Message-ID: <83368ygiow.fsf@gnu.org> References: <20200403174757.GA8266@ACM> <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> <61f565cd-4fee-d48c-a9ef-b78419b3d058@yandex.ru> <83wo6ed4kb.fsf@gnu.org> <464b5639-7790-fdbc-b519-22a6b0e8c016@yandex.ru> <83o8rqaucp.fsf@gnu.org> <551c7634-f614-c5a7-c089-33a0dc56574d@yandex.ru> <83imhyaqyw.fsf@gnu.org> <3ddcec07-079f-18e8-81a7-76eaf9a8187a@yandex.ru> <83a737i9bx.fsf@gnu.org> <83mu76gq03.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="88161"; mail-complaints-to="usenet@ciao.gmane.io" Cc: acm@muc.de, rrandresf@gmail.com, emacs-devel@gnu.org, rms@gnu.org, rudalics@gmx.at To: Dmitry Gutov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Apr 20 19:42:28 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 1jQaR9-000Mn5-0D for ged-emacs-devel@m.gmane-mx.org; Mon, 20 Apr 2020 19:42:27 +0200 Original-Received: from localhost ([::1]:39830 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQaR8-0001Jt-1f for ged-emacs-devel@m.gmane-mx.org; Mon, 20 Apr 2020 13:42:26 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34192 helo=eggs1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQaOj-0007n9-S4 for emacs-devel@gnu.org; Mon, 20 Apr 2020 13:39:58 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:51949) by eggs1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQaOi-0001DV-VK; Mon, 20 Apr 2020 13:39:57 -0400 Original-Received: from [176.228.60.248] (port=2501 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jQaOa-0002qg-7M; Mon, 20 Apr 2020 13:39:48 -0400 In-Reply-To: (message from Dmitry Gutov on Mon, 20 Apr 2020 20:04:06 +0300) 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:247407 Archived-At: > Cc: acm@muc.de, rudalics@gmx.at, rrandresf@gmail.com, rms@gnu.org, > emacs-devel@gnu.org > From: Dmitry Gutov > Date: Mon, 20 Apr 2020 20:04:06 +0300 > > >> The fact that Emacs's behavior can depend on when redisplay happens, and > >> the user cannot reliably control it, is problematic IMHO. > > > > Please be specific: what Emacs's behavior can depend on when redisplay > > happens, apart from whether something was or wasn't updated on > > display? > > The window's scroll position. > > Again: you (setq scroll-conservatively 1) and lean on C-n for a little > while. Depending on whether Emacs manages to redisplay after every > command invocation, the point will, or will not, scroll to the middle of > the window. It could do that several times as well. Yes. because that's what scroll-conservatively = 1 means. > >> Then give up and move point to the middle of the window. > > > > But that's again "not good" according to your opinion, isn't it? > > Why wouldn't my suggestion be good enough? Because you don't want to see recentering, ever: > > Or > > maybe you assume this will solve most of the cases when we currently > > recenter under scroll-conservatively < 101? > > All important ones, yes. See? so set scroll-conservatively to 101, and Bob's your uncle. Yours truly has worked hard and long to have that never recenter, including in some exotic use cases.