From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Can watermarking Unicode text using invisible differences sneak through Emacs, or can Emacs detect it? Date: Thu, 20 Jan 2022 10:20:56 +0200 Message-ID: <83fspirf6f.fsf@gnu.org> References: <87sftk49ih.fsf@yahoo.com> <87sfti51ii.fsf@gmail.com> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30947"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Tim Cross Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Jan 20 10:09:22 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 1nATRa-0007t6-AQ for ged-emacs-devel@m.gmane-mx.org; Thu, 20 Jan 2022 10:09:22 +0100 Original-Received: from localhost ([::1]:36782 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nATRY-0003bW-Gi for ged-emacs-devel@m.gmane-mx.org; Thu, 20 Jan 2022 04:09:20 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:55960) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nASgs-0002bn-EM for emacs-devel@gnu.org; Thu, 20 Jan 2022 03:21:06 -0500 Original-Received: from [2001:470:142:3::e] (port=36548 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nASgm-0007zi-4E; Thu, 20 Jan 2022 03:21:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=yvwC1Nx0SM8bVjqQaGFEDyadm6IzIILUKFcm7is3Du0=; b=czPT7w+uSoey S2IOjAkn/P1lTQ+30gOBM6XvNGJX1ZsKxELfGXcqf3cu1OZ3ywy+1GW4vMnLgH6ENAxjhXW0qeE9S RH2aAjx8NQBbVaLhbtn7Tgbr6PJY1uIygzB/mFsSJCY3knPEsTiopUNuzYEQ4nD7cDTpUfu0tIGPs RjfCRmX7Pzt4ex2enwRUd0lN8iIVR86jQDqO0TcNsPB3Livf7JT6xIGaDyQ8z+QGSSnOrOQCAx8df 07ii6FDJjCWmMXZ3uzcWX3uR4/Uo15vHzAnTvLD/dycKsazAyPnWgZukVSkO4ZbtnvEhkxsohUTqG Tem/KEdrrnRgy9ASRB7Q5w==; Original-Received: from [87.69.77.57] (port=1149 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nASgk-0004v8-UC; Thu, 20 Jan 2022 03:21:00 -0500 In-Reply-To: <87sfti51ii.fsf@gmail.com> (message from Tim Cross on Thu, 20 Jan 2022 17:35:23 +1100) 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:285018 Archived-At: > From: Tim Cross > Date: Thu, 20 Jan 2022 17:35:23 +1100 > > It is a big challenge to find out a way to alert users to this possible > unwanted 'tagging', but at the same time, allow legitimate use. For > exmaple, in org-mode, it can sometimes be difficult to combine different > markup and other syntax - often it is because of a corner case which is > difficult to address with font-locking regexp. Adding a zero-width space > is sometimes sufficient to work around the ambiguity in tghe regexp. A single zero-width character should never be flagged, at least not by default, because its uses are mostly legitimate and important.