From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Axel Svensson Newsgroups: gmane.emacs.bugs Subject: bug#57072: [BUG] update-glyphless-char-display and variation selectors Date: Fri, 12 Aug 2022 08:50:18 +0200 Message-ID: References: <83edxpvec4.fsf@gnu.org> <83leruq3p3.fsf@gnu.org> <83a68apxbm.fsf@gnu.org> <83pmh6nh2f.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21050"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 57072@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Aug 12 08:51:23 2022 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 1oMOVu-0005Ia-9J for geb-bug-gnu-emacs@m.gmane-mx.org; 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc; bh=/Fym6p2zvmHgw4Igy+B+8Je16QOswcGLC9ba1joReoE=; b=rGT0O9K7XZZEmMYv9tLL5mX6AaWs89cNonBoBGgKZnfDrgrvC8OeONpfRoaYxMsG/J CroWQCGSJJfKOzrNX3S7QRhLvUhIxpbW37qA8EDfpv02byfi4Drpbt4P6csZVcfyN/Vy pEdWLM4Fj2x2Z9C3KIDH2wyI/W2wyzdUu9gHQ/oVMY6TjlfvKafbCxBQhBzNahwKfwSO v3+1z8pVVVWHV9wchJY8A/OWPWuoEUxI/KU29bUZke5RdvzaLnVb0lhUNrcvpLhD7N7R hZAOA4w+4EOqrcWlL7MXCvJhsF64KpXpv+90qf98ZZ22qA/syD39pxAALXEw6hShWHhN CwKg== X-Gm-Message-State: ACgBeo39VctwSfF8CCF0NtDiWkI+f7fmCGclAxKWW1XVoPm0FmSRJhDP 4Ql8pjZ02sN9fWbmoJtprOiKq7XuPAVXPvkIJiTQcCxnZUt5DQ== X-Google-Smtp-Source: AA6agR75rCSXdb7dTSD+K/R05672sWw+eghLkUEEgbAP6lCfqcnbchptbpodnZL+zu2CMaBkQDty2k8r8w/2Q23BdVo= X-Received: by 2002:a05:620a:24c3:b0:6ba:dac8:4319 with SMTP id m3-20020a05620a24c300b006badac84319mr90950qkn.52.1660287028968; Thu, 11 Aug 2022 23:50:28 -0700 (PDT) In-Reply-To: <83pmh6nh2f.fsf@gnu.org> 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:239389 Archived-At: > What does Unicode say about the functionality of the variation > selectors beyond VS-16? The code charts divide them into three groups: - VS1 through VS14 are "Variation selectors" [1] - VS15 through VS16 are "Emoji-specific variation selectors" [1] - VS17 through VS256 are "Ideographic-specific variation selectors" [2] The standard itself in chapter 23.4 [3] makes no distinction between them but say that the only sanctioned uses that should have any effect, are the ones defined in: - StandardizedVariants.txt [4] in the Unicode Character Database, which currently uses only VS1 through VS3. Confusingly though, some of them seem to be used for ideographic purposes. - Unicode Technical Standard #51 for emojis [5], which says that VS15 is "used to request a text presentation for an emoji character" while VS16 is "used to request an emoji presentation for an emoji character". - Unicode Technical Standard #37 for ideographic variation [6], which confirms that it only uses VS17 through VS256. In any case, it seems that admin/unidata/blocks.awk needs fixing, since it currently handles only VS1 through VS16 and does so as if they were all for emoji use. [1] https://www.unicode.org/charts/PDF/UFE00.pdf [2] https://www.unicode.org/charts/PDF/UE0100.pdf [3] https://www.unicode.org/versions/Unicode14.0.0/ch23.pdf [4] https://www.unicode.org/Public/14.0.0/ucd/StandardizedVariants.txt [5] https://www.unicode.org/reports/tr51/#Emoji_Variation_Sequences [6] https://www.unicode.org/reports/tr37/