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: Sun, 12 Apr 2020 10:01:27 +0300 Message-ID: <83h7xpkx14.fsf@gnu.org> References: <20200403174757.GA8266@ACM> <83a73qt6zs.fsf@gnu.org> <97c4254e-ff43-8402-3645-f713c408c245@gmx.at> <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> <4c5ebff1-39ab-3d63-6118-42befc93b862@yandex.ru> <6914ebb2-2dfa-efdc-1181-c42259219bca@yandex.ru> <83zhbjna0q.fsf@gnu.org> <903b7d31-bd0e-e2dc-a981-d090ed959ccb@yandex.ru> <83pncfmpme.fsf@gnu.org> <94ee576f-ff26-cad9-3e22-b75299ff9cdb@yandex.ru> <83h7xrmjg3.fsf@gnu.org> <2ae375b2-da26-5525-603a-73133fda432d@yandex.ru> <83zhbilamm.fsf@gnu.org> <3a69f36a-a1d0-ea9f-fcce-2c0cc65e2604@yandex.ru> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="47979"; mail-complaints-to="usenet@ciao.gmane.io" Cc: rms@gnu.org, emacs-devel@gnu.org, rudalics@gmx.at, rrandresf@gmail.com, monnier@iro.umontreal.ca, acm@muc.de To: Dmitry Gutov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Apr 12 09:02:38 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 1jNWdZ-000CNo-Oc for ged-emacs-devel@m.gmane-mx.org; Sun, 12 Apr 2020 09:02:37 +0200 Original-Received: from localhost ([::1]:59442 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jNWdY-0007Pl-RT for ged-emacs-devel@m.gmane-mx.org; Sun, 12 Apr 2020 03:02:36 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:33329) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jNWcp-00070K-4u for emacs-devel@gnu.org; Sun, 12 Apr 2020 03:01:52 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:55833) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1jNWcn-0003W1-Pd; Sun, 12 Apr 2020 03:01:49 -0400 Original-Received: from [176.228.60.248] (port=1048 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jNWce-00068C-NU; Sun, 12 Apr 2020 03:01:40 -0400 In-Reply-To: <3a69f36a-a1d0-ea9f-fcce-2c0cc65e2604@yandex.ru> (message from Dmitry Gutov on Sun, 12 Apr 2020 05:51:58 +0300) 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:246858 Archived-At: > Cc: monnier@iro.umontreal.ca, acm@muc.de, rrandresf@gmail.com, > emacs-devel@gnu.org, rms@gnu.org, rudalics@gmx.at > From: Dmitry Gutov > Date: Sun, 12 Apr 2020 05:51:58 +0300 > > On 11.04.2020 10:55, Eli Zaretskii wrote: > > >> Maybe the fact that you see updating the highlighting after the text has > >> been displayed as okay, and I don't. It feels like flickering to me, a > >> visual aggravation. Thus, if I see that during scrolling, it's also > >> "flickering". > > > > That's not flickering, at least not in our accepted terminology. > > Flickering is redrawing of the entire frame, without any changes to > > the contents. > > Allow me to disagree I was talking about our terminology. Disagreeing with accepted terminology will just increase confusion, as happened here. I Only now understand what you mean by that. > IOW, the scrolling speed-up it offers is limited (but could be enough in > optimized builds for most of us, and even for -Og builds of current > master), but the the downside it brings is the smallest among all the > options we've had discussed here. In your opinion; mine differs. > My point above there was rather different: removing features to > compensate for a high keyboard repeat rate just doesn't seem like a good > solution. We do remove features in other similar situations, for example in so-long-mode. > >> If you go back to my last patch and try it, you might see that both the > >> default behavior, as well as the new behavior with f-b-i-s on, *look* > >> more responsive. > > > > Perhaps with optimized builds on your fast machine, they do. But we > > are specifically discussing slow systems here. > > Have you tried them? Do they not look more responsive [while scrolling > continues] than the default behavior? Yes. No. > >> Ideally, > >> Emacs should stop scrolling as soon as I release the 'v' key. No matter > >> how many screenfuls it had managed to scroll through in the meantime. > > > > jit-lock-defer-time satisfies this requirement, at least here, whereas > > fast-but-imprecise-scrolling doesn't. > > (setq jit-lock-defer-time 0) doesn't satisfy that requirement on my > machine with '-Og -g3'. Don't use zero, use something like 0.05 or 0.1.