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.bugs Subject: bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts Date: Mon, 01 Jun 2020 19:14:52 +0300 Message-ID: <83wo4qepab.fsf@gnu.org> References: <83zh9merd4.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="65965"; mail-complaints-to="usenet@ciao.gmane.io" Cc: dfussner@googlemail.com, 41645@debbugs.gnu.org To: Pip Cet Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jun 01 18:24:37 2020 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 1jfnEr-000H3l-Pt for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Jun 2020 18:24:37 +0200 Original-Received: from localhost ([::1]:53152 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jfnEq-0000RU-PA for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Jun 2020 12:24:36 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50960) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jfn5a-0005Xy-VD for bug-gnu-emacs@gnu.org; Mon, 01 Jun 2020 12:15:04 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:53522) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jfn5a-0001Z5-Kh for bug-gnu-emacs@gnu.org; Mon, 01 Jun 2020 12:15:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jfn5a-0000gn-Eu for bug-gnu-emacs@gnu.org; Mon, 01 Jun 2020 12:15:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 01 Jun 2020 16:15:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 41645 X-GNU-PR-Package: emacs Original-Received: via spool by 41645-submit@debbugs.gnu.org id=B41645.15910280992625 (code B ref 41645); Mon, 01 Jun 2020 16:15:02 +0000 Original-Received: (at 41645) by debbugs.gnu.org; 1 Jun 2020 16:14:59 +0000 Original-Received: from localhost ([127.0.0.1]:36835 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jfn5W-0000gH-NZ for submit@debbugs.gnu.org; Mon, 01 Jun 2020 12:14:59 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:43486) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jfn5U-0000g4-MJ for 41645@debbugs.gnu.org; Mon, 01 Jun 2020 12:14:57 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:51893) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jfn5P-0001WH-DQ; Mon, 01 Jun 2020 12:14:51 -0400 Original-Received: from [176.228.60.248] (port=3562 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jfn5O-0003eF-La; Mon, 01 Jun 2020 12:14:51 -0400 In-Reply-To: (message from Pip Cet on Mon, 1 Jun 2020 15:50:16 +0000) 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:181348 Archived-At: > From: Pip Cet > Date: Mon, 1 Jun 2020 15:50:16 +0000 > Cc: David Fussner , 41645@debbugs.gnu.org > > > I cannot reproduce this on my system, FWIW. Very strange. > > I can reproduce this, but it depends on which font it uses. I have only 2 fonts that cover that codepoint, and both produce correct display. When I try a font that doesn't support it, I see a box with hex code, which, of course, causes no problems. When you do reproduce the problem, do the characters around CGJ use the same font as the CGJ itself, or do they use a different font? If the latter, the composition won't work, and maybe that is when the problem happens? > Is it possible it's bug 41454? I'm attaching that patch in case it > does anything and people feel like testing it. I'm guessing you already tested, and it doesn't fix the problem for you (when you use the fonts which do reproduce the problem)? I think that bug is unlikely to be the culprit: symptoms such as those described here usually mean that Emacs becomes confused about the metrics of the character's glyph on display. So to find the root cause, one should step through the code which draws the character and then the code which draws the cursor on that character, and see what's going on there with the metrics.