From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Yuri Khan Newsgroups: gmane.emacs.devel Subject: Re: Ligatures Date: Wed, 20 May 2020 02:00:03 +0700 Message-ID: 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> <83blmk80hm.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="7929"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Joost Kremers , tomas@tuxteam.de, Emacs developers To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue May 19 21:01:10 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 1jb7UA-0001pp-Cn for ged-emacs-devel@m.gmane-mx.org; Tue, 19 May 2020 21:01:06 +0200 Original-Received: from localhost ([::1]:39206 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jb7U9-0005E9-CR for ged-emacs-devel@m.gmane-mx.org; Tue, 19 May 2020 15:01:05 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50754) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jb7TO-0004Qt-6K for emacs-devel@gnu.org; Tue, 19 May 2020 15:00:18 -0400 Original-Received: from mail-vs1-xe30.google.com ([2607:f8b0:4864:20::e30]:35130) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jb7TN-0000pC-4v; Tue, 19 May 2020 15:00:17 -0400 Original-Received: by mail-vs1-xe30.google.com with SMTP id 62so267254vsi.2; Tue, 19 May 2020 12:00:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=4RAxjK+DeH4ys5BZH+jC0AJS9Hs1xKXIUm0A1ZFXpnM=; b=T+yz0IkYOpGeEA1H5nFKDRtvo6+T5t5q0IpLEA9RvhS1bC+71FJCOAzqiRdgBnpqkt b5Uo448gUOK2BiqvybG9zQ+1zZjHo1Id9ar+RR3fRw4ZK44xaYSI1vxPbdqyDbGsu1q/ cLpJh45mrcw4iJP5M43xkx/tui9OfyK3t0fuSAzbQsXnwOi3TFS9jXADhDF0beijapK6 mF9fXqOQBb6VUdR6c6Dnkl/RcKw9GwkOMD/4+BcRZJdbeIM4zN30YSkSIruU3LUExaSy ImQ13UAPHTg+eQuo3YLEtAxJYlTCHU80XAGBcDmpDjM0BVvdQq5Uk7oBpjlVPClboxEP serg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=4RAxjK+DeH4ys5BZH+jC0AJS9Hs1xKXIUm0A1ZFXpnM=; b=T2jFGUoAVUwJSEzEyeCqbmCkvHhIj1YKu5xx0b73On/94eGcWSjLnxHmZKsUu23oPC wWOu/36DmBVMzx7zy/HqMmQGFmD4BNLTc3lP9RVIB3hyCABFlUNBjfv3eSzf3T5MQ8NL oABEfa3aoeLz2rniBU/WEtsOIbOEMI2O+pJdWl6SLw1n6BSFH/iWOMbcht8m54fXvudW Qo0FzXu1B6R9hG5vfQ8Mp2f+cX9LBJAzvFwFAm1BQGFKRS2vWRx27irkrOZjWi8clyV3 CKoPIjLiI8FOetiIol2oQZFlieFWQQeqwMPxnD8PZQq9OIqMW9EOzLGzHQXTVSZZkzbg iPjw== X-Gm-Message-State: AOAM531Cv5Ajkxgzasj/IWGiSbK2p7fyL4pLNjIo26gP0o+268DmCNCv EL4RpjPsX0kgOQ5pm4rJfJ3b0/Zbc3wOfQ/fpxs+XNOHsas= X-Google-Smtp-Source: ABdhPJxh/Fv1QzVRf8e+BGIxQaAit1WaSulQXyv0+UpULHlew7MrS/Sopxh00c7GP5S5VNWML+pq/YGaWHChabXPVIw= X-Received: by 2002:a67:6285:: with SMTP id w127mr537803vsb.139.1589914815368; Tue, 19 May 2020 12:00:15 -0700 (PDT) In-Reply-To: <83blmk80hm.fsf@gnu.org> Received-SPF: pass client-ip=2607:f8b0:4864:20::e30; envelope-from=yurivkhan@gmail.com; helo=mail-vs1-xe30.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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:250977 Archived-At: > > (And putting multiple diacritics over a single base character in> > var= ious 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. I meant, the Canonical Order spec could be a lot simpler (=E2=80=9Cjust sor= t all diacritics according to their codepoint value=E2=80=9D rather than =E2= =80=9Ctake great care to only swap two adjacent diacritics if their combining classes differ and ordered wrongly=E2=80=9D) if diacritics order did not matter. But it does; is different from , so the use case of putting point between the base character and its following diacritic in order to insert a different one is somewhat important. Indeed, toggling auto-composition-mode solves that.