From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Scrolling commands and skipping redisplay, was: Re: emacs rendering comparisson between emacs23 and emacs26.3 Date: Thu, 09 Apr 2020 15:16:38 -0400 Message-ID: References: <20200403174757.GA8266@ACM> <20200404104553.GA5329@ACM> <07fe3b69-3ab2-3173-0696-cb17809e2b91@gmx.at> <83blo7v68b.fsf@gnu.org> <1845d7aa-9ae4-3d95-6a30-c7b1d8d8adec@gmx.at> <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> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="89322"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: rms@gnu.org, emacs-devel@gnu.org, rudalics@gmx.at, rrandresf@gmail.com, acm@muc.de, Eli Zaretskii To: Dmitry Gutov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Apr 09 21:18:26 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 1jMcgz-000N8H-Fo for ged-emacs-devel@m.gmane-mx.org; Thu, 09 Apr 2020 21:18:25 +0200 Original-Received: from localhost ([::1]:54428 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jMcgx-00015U-HG for ged-emacs-devel@m.gmane-mx.org; Thu, 09 Apr 2020 15:18:23 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57348) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jMcfN-0007zP-0X for emacs-devel@gnu.org; Thu, 09 Apr 2020 15:16:45 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jMcfL-0000aE-KZ for emacs-devel@gnu.org; Thu, 09 Apr 2020 15:16:44 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:37038) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jMcfK-0000Xu-1q; Thu, 09 Apr 2020 15:16:42 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 28F5044FEEA; Thu, 9 Apr 2020 15:16:41 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id E4BF644FEE6; Thu, 9 Apr 2020 15:16:39 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1586459799; bh=BGN2y17x85ftAsjjrEXMrNZXxTnuIZ8T0XgTGFQEMGM=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=FPzV8FzmW5lKHGL+c4jChElG8K3+pGxHry8xHmLluEmjO01Z8cOebHflRAyCRmz/f VPO8RTwiO4vxhJ91cO86FhVlOW0YYYzw/s/3aNFIHTG37yQ10R6iSKnjfxbeyIe7oj kRczw4hy+oroXV9JoarAjRGmos43nZYtfbA7+vOk+0cIri5yUT3CND8ATI7T3NQLZm lumdAy1EbAWCv8rfbGvR8xgMXwT53P3SOFdsVILpKpWOw3K4k5q/2KlDyzabF/xeh4 AUQg/waJOb2C5SlxLFqvaFmmI3z7pY9MQfyN+oYtwMrTsqa8HLZY8UDKREKsZoLz1p 2tIGBbfirdHBQ== Original-Received: from alfajor (unknown [104.247.241.114]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 6DE831204F1; Thu, 9 Apr 2020 15:16:39 -0400 (EDT) In-Reply-To: <4c5ebff1-39ab-3d63-6118-42befc93b862@yandex.ru> (Dmitry Gutov's message of "Thu, 9 Apr 2020 21:37:08 +0300") X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 132.204.25.50 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:246725 Archived-At: > Thanks. I tried it (and mentioned in the parent thread), but it seems like > in addition to the downsides of f-b-i-s (imprecise scrolling, which > apparently makes it a bad candidate for default behavior) it adds some > extra flickering from time to time (I figured because some redisplays > occurred before the idle timer had the chance to run). It's not as > obvious in an 'emacs -Q' session, but with my custom config it's more > apparent. And that flickering occurs the most while I'm flooring C-v. I think the flickering is the direct effect of the defer'd jit-lock: you first see the non-jit-lock'd text and only after that the idle timer runs jit-lock and updates the display accordingly. > Is it possible that the conditions for skipping redisplay might return > false while input-pending-p returns t? Very much so, yes: the tests are sufficiently different and the possible circumstances sufficiently varied that it's almost unavoidable. E.g. usually the redisplay is skipped based on the presence of input at the *beginning* of the command, whereas the `jit-lock-defer-time` thingy samples the input later, when jit-lock is called. Stefan