From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#50177: Support U+20DD COMBINING ENCLOSING CIRCLE Date: Tue, 24 Aug 2021 19:38:56 +0300 Message-ID: <8335qyx0f3.fsf@gnu.org> References: <87eeaj21py.8.fsf@jidanni.org> <83bl5nvyzx.fsf@gnu.org> <87k0kaoo6y.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21936"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 50177@debbugs.gnu.org, jidanni@jidanni.org To: Lars Ingebrigtsen , Kenichi Handa Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Aug 24 18:41:21 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 1mIZUG-0005Td-N7 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 24 Aug 2021 18:41:20 +0200 Original-Received: from localhost ([::1]:34846 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mIZUF-0001Q7-Hg for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 24 Aug 2021 12:41:19 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57184) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIZT0-0006cB-6C for bug-gnu-emacs@gnu.org; Tue, 24 Aug 2021 12:40:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:33558) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mIZSz-0005nH-T3 for bug-gnu-emacs@gnu.org; Tue, 24 Aug 2021 12:40:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mIZSz-0002Hq-JK for bug-gnu-emacs@gnu.org; Tue, 24 Aug 2021 12:40:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 24 Aug 2021 16:40:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 50177 X-GNU-PR-Package: emacs Original-Received: via spool by 50177-submit@debbugs.gnu.org id=B50177.16298231528692 (code B ref 50177); Tue, 24 Aug 2021 16:40:01 +0000 Original-Received: (at 50177) by debbugs.gnu.org; 24 Aug 2021 16:39:12 +0000 Original-Received: from localhost ([127.0.0.1]:45104 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mIZSC-0002G8-5h for submit@debbugs.gnu.org; Tue, 24 Aug 2021 12:39:12 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:40944) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mIZSA-0002Fs-CS for 50177@debbugs.gnu.org; Tue, 24 Aug 2021 12:39:11 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:43342) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mIZS4-0005C1-It; Tue, 24 Aug 2021 12:39:04 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4209 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIZS4-0006w6-5F; Tue, 24 Aug 2021 12:39:04 -0400 In-Reply-To: <87k0kaoo6y.fsf@gnus.org> (message from Lars Ingebrigtsen on Tue, 24 Aug 2021 17:30:13 +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:212557 Archived-At: > From: Lars Ingebrigtsen > Cc: 積丹尼 Dan Jacobson , > 50177@debbugs.gnu.org > Date: Tue, 24 Aug 2021 17:30:13 +0200 > > We have a number of open bug reports in this area. At least 44784, > 23292, 17739, which may or may not be the same underlying problem. > (Probably different issues, really.) 44784 and 23292 are due to a problematic font (DejaVu Sans Mono). 17739 -- not clear. > I haven't looked at the machinery here at all -- is there a fundamental > reason why Emacs can't combine glyphs from different fonts? The basic reason is that glyphs from different fonts cannot combine well because they were designed to look differently, and so offsets don't match. That is almost certainly the reason when we use our fallback composition code in composite.el. I'm less sure about modern shaping engines like HarfBuzz -- we should ask their developers to be sure; feel free to open an issue/question on their GitHub. CC'ing Handa-san, in the hope that he could explain better why we disallow character composition from different fonts.