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: Thu, 04 Nov 2021 09:06:10 +0000 Message-ID: <7699dbfaffbaf1aa8655@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> <11d5fecb446ff1ae06b6@heytings.org> <83zgqlf0c2.fsf@gnu.org> <11d5fecb4494b19a9730@heytings.org> <83pmrgfl13.fsf@gnu.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="cO6cbfvYgV" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37939"; mail-complaints-to="usenet@ciao.gmane.io" Cc: juri@linkov.net, cpitclaudel@gmail.com, stefan@marxist.se, emacs-devel@gnu.org, db48x@db48x.net, monnier@iro.umontreal.ca, yuri.v.khan@gmail.com To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Nov 04 10:07:10 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 1miYiD-0009eM-MK for ged-emacs-devel@m.gmane-mx.org; Thu, 04 Nov 2021 10:07:09 +0100 Original-Received: from localhost ([::1]:39522 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1miYiC-0007Rn-1v for ged-emacs-devel@m.gmane-mx.org; Thu, 04 Nov 2021 05:07:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57164) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miYhK-0006Rs-RE for emacs-devel@gnu.org; Thu, 04 Nov 2021 05:06:14 -0400 Original-Received: from heytings.org ([95.142.160.155]:52438) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miYhI-0004XC-Qv; Thu, 04 Nov 2021 05:06:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20210101; t=1636016770; bh=mSr8Q+X6LRcVWg4t9sVwH0YIko3JS6syj7naA3TH3Vo=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=PRXNkQi6z9Hx3mWmkTf99hR5ACnl3xLRfi0ZvZT2Cta2LKz5K0HrRdKUaFQP7n9Ac fcl54b/Gd/4s1NlBco2mWd+S8jH+DaNFlvADUqTED6dijAZjfezNWIe31wYShs0Eu6 wgj2/DO14cqPptIV/RGJulgsNpTTY9TQMZFyIUMxh1okncCe4ZM8kojJL/EBfiQPoI 0T0QqHsQOoVhiFKb9xuqJ4j0vOuFPgVprn419H6PxYZ6m7J1tfpQVub807JIU7a2NL B1aE21Xp5li9Rj8pA74t4+0qc9CxDI9NEzRW8NPZ+tyfB4/CCnVIl2SQZfyhKmfqw4 J57K1HkJiCbkQ== In-Reply-To: <83pmrgfl13.fsf@gnu.org> Content-ID: <7699dbfaff6273ca9932@heytings.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:278661 Archived-At: --cO6cbfvYgV Content-Type: text/plain; charset=us-ascii; format=flowed Content-ID: <7699dbfaffabd27736ff@heytings.org> >> Here's a screenshot with emacs -Q (current trunk). I did M-x >> highlight-regexp RET y RET hi-green RET M-x highlight-regexp > with all reordering characters> RET hi-green RET. There's one >> reordering character between each of the "abcdefghij" string. I zoomed >> that picture, I see absolutely nothing. > > If you configured highlight-regexp to highlight only the formatting > controls, how come 'y' is highlighted in green on the image you sent? Is > 'y' one of the characters that are supposed to be highlighted? > As explained above, I first did a highlight-regexp on 'y' to show what the chosen highlighting option does on non-glyphless characters. > > If you shift-highlight one of these formatting control characters, and > only one such character, don't you see a thin whitespace shown in the > background color of the region face? > If you look very close, yes, you see see something in that case. In the attached screenshot, there's a one-pixel light gray bar on the left of the cursor. That's not what I'd consider "visible". --cO6cbfvYgV Content-Type: image/png; name=highlight.png Content-Transfer-Encoding: base64 Content-ID: <7699dbfaff89530aa369@heytings.org> Content-Description: Content-Disposition: attachment; filename=highlight.png iVBORw0KGgoAAAANSUhEUgAAAEYAAAAoCAMAAAB0DnycAAAB4FBMVEX////2 9fQAAAC7u7unp6cnJyc/Pz/7+/ulpaVNTU0WFhYGBgYYGBg+Pj6Li4vz8/P+ /v6ZmZkuLi4JCQlQUFC+vr6AgIDFxcXq6ur6+vrk5OSbm5skJCQsLCwKCgpW VlbZ2dm4uLgjIyMaGhrKyspnZ2dpaWn39/dsbGzg4OAhISESEhLR0dELCwsR ERHj4+NcXFypqalycnIICAgtLS01NTUmJiYHBwdjY2O2trbp6ent7e26uro4 ODhzc3MBAQGioqLIyMhBQUEdHR38/PwrKytUVFQFBQVTU1PJycmXl5cMDAyU lJTo6Oj4+PhVVVVYWFjv7+8VFRUwMDADAwPMzMz5+fkvLy+5ubmgoKCrq6sE BASIiIg2NjawsLBOTk5LS0ujo6N9fX3r6+v29vYpKSnW1tZ0dHQTExPf399X V1cfHx/S0tJlZWX9/f1/f3+hoaFHR0czMzONjY3CwsIgICCcnJxISEiMjIzD w8N+fn5iYmJaWlrT09NdXV2BgYH09PQqKirNzc0xMTGysrKFhYXd3d0CAgLu 7u5DQ0MXFxeYmJiWlpZxcXFbW1s3Nzc6OjpfX19mZmaHh4dwcHDU1NSQkJAo KCh5eXlRUVEZGRnGxsbl5eWfn5/y8vLa2tpKxLLhAAACO0lEQVRIx+3V+VPT QBQH8PUrGInVRqGVoBZUtEIBD1C0iEG0QgUq1ljUQhUryqWgglpFihfe933/ qya7m01IGccZZ/wBu7808/bNJ7v73qaE/J9jEdwjz/wtsxgo+GOmEEvyzD9j pKVF8jLP8hVem1FWriqWS3wOxuNfXaqWrVnLGa9/XUAur3Aw6zfwt2ysFMwm FvELZnOQJatbKFNVTaOhGpupFaut28qZbVZkO2d22NuoNxi1gc/v3GUzjbv3 hKWmvc3APs5ocktTcH8rcOAgZSISIZWHPG1ye5Qyh4GOzq5YzRFogukuY79H 4zjGGf24+ZDoAU5Q5iQhp5L09Vpvo8H0ASkzQylCbqVOo44zZ1igHzhrMlqa eEOOSp3TMcAyog7m/IXmwTaakORML5sYAoZNZoSQlLPgo8BFlnEpIJgxfW5L GMw4m4kBl03mCiFXncyEuUo2Ji3mmruzDKaFTSWA65y54UzKADfdTCFwyxdW jacpwfBNVQHd823qdu6mvMA0lxsEYx9xlh/xjPOIg0nccR1xWsjj9qb0u7Rj 7wE+V8GRNQtutNj9uQVXQtAfzMa6MlMPawWjyf2PYtHHQLUi2i/a/iQZL8nQ 9ntqtN+zcGK03G6/59Zae14IZtqKpea/DJJ1GV6KyzDzikVGKl4LpuANa9m3 OVdTekeThiZpdPC9fTXVD30dxR8/lRIHo3RG6uXPE44PxZfs17T67fsAP8Af Y5FAfPjnbz5brrEw/u7yzAIevwCo8FxZvD254QAAAABJRU5ErkJggg== --cO6cbfvYgV--