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: Ligatures Date: Tue, 19 May 2020 17:26:13 +0300 Message-ID: <83blmk80hm.fsf@gnu.org> References: <20200517165953.000044d2@web.de> <83lflqblp0.fsf@gnu.org> <83ftbybio3.fsf@gnu.org> <83zha69xs2.fsf@gnu.org> <83367x9qeq.fsf@gnu.org> <875zcs32fv.fsf@Otto.invalid> <20200519072250.GA7874@tuxteam.de> <87lflol5oy.fsf@fastmail.fm> <20200519080705.GF7874@tuxteam.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="76046"; mail-complaints-to="usenet@ciao.gmane.io" Cc: joostkremers@fastmail.fm, tomas@tuxteam.de, emacs-devel@gnu.org To: Yuri Khan Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue May 19 16:26:46 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 1jb3Cg-000Jh3-BE for ged-emacs-devel@m.gmane-mx.org; Tue, 19 May 2020 16:26:46 +0200 Original-Received: from localhost ([::1]:60258 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jb3Cf-0002En-Dj for ged-emacs-devel@m.gmane-mx.org; Tue, 19 May 2020 10:26:45 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40400) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jb3CD-0001mO-64 for emacs-devel@gnu.org; Tue, 19 May 2020 10:26:17 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:52075) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jb3CC-0004pa-FR; Tue, 19 May 2020 10:26:16 -0400 Original-Received: from [176.228.60.248] (port=4827 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jb3CB-0006mD-5C; Tue, 19 May 2020 10:26:15 -0400 In-Reply-To: (message from Yuri Khan on Tue, 19 May 2020 17:17:25 +0700) 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:250926 Archived-At: > From: Yuri Khan > Date: Tue, 19 May 2020 17:17:25 +0700 > Cc: Joost Kremers , > Emacs developers > > An example of character combining other than side-by-side stacking is > much closer than that: Combining diacritics. Sure, you can delete an > acute accent from á by pressing Backspace, but you cannot put point > between the ‘a’ and the accent if you want to put a different > diacritic between them. Well, you can (this is Emacs, right?): just disable automatic composition with "M-x auto-composition-mode", and you can do any editing you want. Then re-enable the mode again. > (And putting multiple diacritics over a single base character in > various orders is a thing, it is the subject of the Unicode > Canonical Order subsection in Unicode standard.) Canonical order of diacritics is indeed important for jobs such as comparison, searching, etc. But we are talking about display, and for display there's a requirement that the order should not matter as long as the base character comes first. AFAIR, HarfBuzz supports that requirement, but not every other shaping engine does.