From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Phil Sainty Newsgroups: gmane.emacs.devel Subject: Re: Can watermarking Unicode text using invisible differences sneak through Emacs, or can Emacs detect =?UTF-8?Q?it=3F?= Date: Wed, 19 Jan 2022 23:05:51 +1300 Message-ID: References: <87sftk49ih.fsf@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="5441"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Orcon Webmail Cc: Richard Stallman , emacs-devel@gnu.org To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jan 19 11:08:32 2022 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 1nA7tH-0001Id-Vd for ged-emacs-devel@m.gmane-mx.org; Wed, 19 Jan 2022 11:08:31 +0100 Original-Received: from localhost ([::1]:35564 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nA7tG-0001LA-Se for ged-emacs-devel@m.gmane-mx.org; Wed, 19 Jan 2022 05:08:30 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:55666) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nA7rQ-0007jB-BJ for emacs-devel@gnu.org; Wed, 19 Jan 2022 05:06:36 -0500 Original-Received: from smtp-1.orcon.net.nz ([60.234.4.34]:46553) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nA7qx-0001mp-Cj; Wed, 19 Jan 2022 05:06:35 -0500 Original-Received: from [10.253.37.70] (port=26250 helo=webmail.orcon.net.nz) by smtp-1.orcon.net.nz with esmtpa (Exim 4.90_1) (envelope-from ) id 1nA7qh-0000XU-Lh; Wed, 19 Jan 2022 23:05:52 +1300 Original-Received: from ip-139-180-65-103.kinect.net.nz ([139.180.65.103]) via [10.253.37.253] by webmail.orcon.net.nz with HTTP (HTTP/1.1 POST); Wed, 19 Jan 2022 23:05:51 +1300 In-Reply-To: <87sftk49ih.fsf@yahoo.com> X-Sender: psainty@orcon.net.nz X-GeoIP: -- Received-SPF: pass client-ip=60.234.4.34; envelope-from=psainty@orcon.net.nz; helo=smtp-1.orcon.net.nz X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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:284969 Archived-At: On 2022-01-19 17:47, Po Lu wrote: > I think the "zero width characters" alluded to are displayed > by Emacs as 1 pixel wide spaces You can highlight them like so: (set-face-background 'glyphless-char "red") I've had that configured ever since https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31194#40 If you're not expecting zero-width characters in text in general, I think it's a good setting. -Phil