From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Robert Pluim Newsgroups: gmane.emacs.bugs Subject: bug#45557: 27.1; Incorrect rendering of COMBINING OVERLINE Date: Thu, 07 Jan 2021 16:28:42 +0100 Message-ID: <874kjs22c5.fsf@gmail.com> References: <83k0sq2j9m.fsf@gnu.org> <20210106.213051.1927113775620623865.enometh@meer.net> <83turu11xm.fsf@gnu.org> <20210107.114031.1253265759097486788.enometh@meer.net> <83pn2gltm7.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="blaine.gmane.org:116.202.254.214"; logging-data="15308"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Madhu , 45557@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jan 07 16:29:09 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 1kxXDp-0003r9-8k for geb-bug-gnu-emacs@m.gmane-mx.org; 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Thu, 07 Jan 2021 07:28:43 -0800 (PST) In-Reply-To: <83pn2gltm7.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 07 Jan 2021 16:16:48 +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:197489 Archived-At: Eli Zaretskii writes: >> Date: Thu, 07 Jan 2021 11:40:31 +0530 (IST) >> Cc: 45557@debbugs.gnu.org >> From: Madhu >>=20 >> * Eli Zaretskii <83turu11xm.fsf@gnu.org> >> Wrote on Wed, 06 Jan 2021 18:10:29 +0200 >> >> From: Madhu >> >> > Anyway, I see no Emacs problems in your description, only font >> >> > problems. The text you sent is displayed correctly on my system, b= oth >> >> > of its lines. >> Can you try using a font with emacs which does not compose the x and >> overbar? > > I already did. The results are as I'd expect: the characters are > rendered separately. > >> >> I assume the mswindows and applemac systems dont pull in harfbuzz? >> > No, the Windows build does use HarfBuzz. >> Whatever is doing the visual composition of x + overbar (when emacs is >> explicitly asked not to do it by turning auto-composition-mode off) - >> it isn't harfbuzz. It happens on an emacs (--without-all) which links >> to freetype without harfbuzz/cairo (and even when emacs isn't using m17n= -lib) >> Very puzzling. > > Indeed. I can reproduce this behaviour using Bitstream Vera Mono and Julia Mono. The display may show the two characters as composed, but they actually aren't: after the 'x' there=CA=BCs what is visually a space, but 'C-x =3D' says it=CA=BCs a COMBINING OVERLINE. If you then toggle auto-composition again that visual space gets redrawn as an OVERLINE. (and if I play with it some more, sometimes the OVERLINE over the 'x' does not get cleared). I can reproduce with a pgtk build as well. Robert