From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: "N. Jackson" Newsgroups: gmane.emacs.bugs Subject: bug#28652: 26.0.60; Display often "flashes" due to double buffering when switching to Emacs frames Date: Fri, 03 Sep 2021 07:52:32 -0400 Message-ID: <87r1e527wf.fsf@moondust.localdomain> References: <87377573ac.fsf@moondust.localdomain> <87a6ku2isi.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7855"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) Cc: 28652@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Sep 03 14:06:26 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1mM7xh-0001tH-Rq for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 03 Sep 2021 14:06:25 +0200 Original-Received: from localhost ([::1]:60516 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mM7xg-0000oi-PJ for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 03 Sep 2021 08:06:24 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53902) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mM7kk-0008G5-7d for bug-gnu-emacs@gnu.org; Fri, 03 Sep 2021 07:53:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:59874) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mM7kj-00088G-Vr for bug-gnu-emacs@gnu.org; Fri, 03 Sep 2021 07:53:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mM7kj-0001Io-Jo for bug-gnu-emacs@gnu.org; Fri, 03 Sep 2021 07:53:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: "N. 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[174.93.72.167]) by smtp.gmail.com with ESMTPSA id i67sm3650722qkd.90.2021.09.03.04.52.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Sep 2021 04:52:34 -0700 (PDT) In-Reply-To: <87a6ku2isi.fsf@gnus.org> (Lars Ingebrigtsen's message of "Fri, 03 Sep 2021 09:57:17 +0200") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:213358 Archived-At: Hello Lars, At 09:57 +0200 on Friday 2021-09-03, Lars Ingebrigtsen wrote: > > nljlistbox2@gmail.com (N. Jackson) writes: > >> When switching between windows in Gnome using Alt-Tab there is >> often a bright flash just after switching to an Emacs frame. >> >> It seems as if the Emacs frame is displayed and then a window of >> some other application appears for a fraction of a second before >> the display settles down to the showing the Emacs frame. >> >> Because the flash is so quick, I Initially thought the Emacs frame >> was being displayed in white before being painted to it's correct >> display, but this is not the case. By choosing distinctive colours >> or distinctive images in my other applications, I can tell that it >> is the window of another application that is flashing up. >> >> [This flashing might be particularly noticeable on this system as >> I use a dark theme in Emacs (Wheatgrass) and most other >> application windows are predominantly white. Also I keep all my >> Emacs frames and all my other application windows maximised or >> full screen (because I have a small display).] > > (I'm going through old bug reports that unfortunately weren't resolved > at the time.) > > I'm also using Gnome (I'm on Debian bullseye), but I can't see these > flashes (I've tried in Emacs 26.1 and Emacs 28) when Alt-Tab-ing between > something that has a bright background and Emacs (which has a black > background). > > Are you still seeing this in recent Emacs/Gnome versions? No, I haven't seen this problem -- at all -- in quite a few Emacs versions. (Sorry I didn't update the bug report with that information -- I had completely forgotten about the bug.) [The only time I see any "flashing" of any sort in Emacs now is while it starts up and restores my desktop frames and windows. My understanding is that this is expected. (It is also much less frenetic that it was in the past.)] Thank you and best regards, Neil.