From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings Newsgroups: gmane.emacs.devel Subject: Re: Unicode confusables and reordering characters considered harmful, a simple solution Date: Wed, 03 Nov 2021 20:21:50 +0000 Message-ID: <11d5fecb446ff1ae06b6@heytings.org> References: <875ytag0hb.fsf@yahoo.com> <87zgqmd5np.fsf@mat.ucm.es> <83wnlqk3rn.fsf@gnu.org> <72dd5c2a-42c7-b12e-05ed-e93adbd89727@gmail.com> <83ilxajyhw.fsf@gnu.org> <83fssejxf8.fsf@gnu.org> <835ytajsv2.fsf@gnu.org> <831r3yjqo9.fsf@gnu.org> <83v91aibe7.fsf@gnu.org> <87o872s0wf.fsf_-_@db48x.net> <83lf25gm1j.fsf@gnu.org> <86h7ctyupr.fsf@mail.linkov.net> <11d5fecb44ffbf6b7dd1@heytings.org> <838ry5ggy9.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30689"; mail-complaints-to="usenet@ciao.gmane.io" Cc: cpitclaudel@gmail.com, yuri.v.khan@gmail.com, stefan@marxist.se, emacs-devel@gnu.org, db48x@db48x.net, monnier@iro.umontreal.ca, juri@linkov.net To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Nov 03 21:22:51 2021 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 1miMmY-0007om-UN for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Nov 2021 21:22:51 +0100 Original-Received: from localhost ([::1]:59772 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1miMmX-0007d2-UU for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Nov 2021 16:22:49 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:60474) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miMlg-0006Wr-6P for emacs-devel@gnu.org; Wed, 03 Nov 2021 16:21:56 -0400 Original-Received: from heytings.org ([95.142.160.155]:51694) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miMle-0007O7-Aq; Wed, 03 Nov 2021 16:21:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20210101; t=1635970911; bh=12eN46MOyZNwCBvFLk4ErK3BTB9O9RGaaE2nusBUVtk=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=L0tznk45lf0+UYe/EIPbtyhrHSb+AU7eWoV+ZWNL1GXSszbHIJPULcLqWowR/WaXp 4t7HXLqU9g6amiHDltRSmkfMEYc04kuD40DiYOrBiFpVgBWuxhUIeKC281lrhTawy2 6b9sjMN1RzOtuLjCu0/AHXS1pUeSi0kdOAcp6J9zjtYV4w2xch2O5XtD+uioY6Bgsi nDI5+IZ5EduO+BTtsG6/OtYOVAlBo/Z4sYE+HOsA+7TF/W1/AcvbdiZYiumgABLXtv rOK2M4aLvym91EyZjkXO1QOZLUOJ2WfLsLboU/UBrOzSLuxakDpPePxin7BWPU4BBI FiHj6mfcTNJ2w== In-Reply-To: <838ry5ggy9.fsf@gnu.org> Received-SPF: pass client-ip=95.142.160.155; envelope-from=gregory@heytings.org; helo=heytings.org 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, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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:278626 Archived-At: >>>> Anyway, if one wants to be able to highlight certain characters on >>>> display, one could also use highlight-regexp, I think. >>> >>> Or markchars.el with markchars-what customized to >>> markchars-confusables. >> >> Neither would work AFAICS, because these characters are glyphless. >> Highlighting a glyphless character will not make it more visible. > > ??? Of course, it will make it more visible: if the face has a distinct > background. The "thin space" display looks like whitespace, and > whitespace can have background color to make it stand out. > I tried various of the predefined colors with highlight-regexp, of course those with a distinct background, and none make any of those characters more visible. Not even with a single pixel wide bar.