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: Sat, 22 Jan 2022 08:58:04 +0200 Message-ID: <837dasntoj.fsf@gnu.org> References: <87sftk49ih.fsf@yahoo.com> <837dawt0h4.fsf@gnu.org> <838rv9plyf.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="10677"; mail-complaints-to="usenet@ciao.gmane.io" Cc: psainty@orcon.net.nz, luangruo@yahoo.com, emacs-devel@gnu.org To: rms@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Jan 22 08:01:41 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 1nBAP7-0002fL-AQ for ged-emacs-devel@m.gmane-mx.org; Sat, 22 Jan 2022 08:01:41 +0100 Original-Received: from localhost ([::1]:36724 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nBAP6-0003V3-2H for ged-emacs-devel@m.gmane-mx.org; Sat, 22 Jan 2022 02:01:40 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:36814) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nBAM5-0002NX-Tz for emacs-devel@gnu.org; Sat, 22 Jan 2022 01:58:33 -0500 Original-Received: from [2001:470:142:3::e] (port=46532 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 1nBAM5-00057M-BQ; Sat, 22 Jan 2022 01:58:33 -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=d7TRPzHeYsZpKCREsM+hQbD/xhQQelCLxGJbGzCMQHs=; b=ii4ygm7ezmlv xe+5ZImIACl8tukUWgDP4jUamdIUCps2KVk86ppjUJJow8qH6+vOfmrfoHUCETKjuv2KJPHuxwUu7 yDp3jLvWlTd9fujDhqXs4LQp/EIgBMGzYm1dDwmbE3JrfkTbv8jcWli2nL/uRebhggqDOGJIwuS// 1VKU013h7JgBFO88yumLGRwnGVOnmKDFT7iuX6bQWOpVlEFWStC46qwD2JsuYP/cQSK5rlQuCFCcM 5aJRjLOJ6IFS6QRzrSGgAn2QxvW1jBZ7rhmSSSpusp9amf9RFhcYszLe07E3wlrdjZDIq5ptNhcJ0 jXx0PEVo1CZ7T+Xi64AQ1g==; Original-Received: from [87.69.77.57] (port=2210 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 1nBALv-0005Yq-LS; Sat, 22 Jan 2022 01:58:23 -0500 In-Reply-To: (message from Richard Stallman on Fri, 21 Jan 2022 23:37:59 -0500) 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:285172 Archived-At: > From: Richard Stallman > Cc: psainty@orcon.net.nz, luangruo@yahoo.com, emacs-devel@gnu.org > Date: Fri, 21 Jan 2022 23:37:59 -0500 > > I'm asking about a feature whereby a user can direct Emacs not to use > ligatures in display on a certain terminal. The idea is, when using a > terminal that can't display ligatures, Emacs should always display > multiple letters instead of a ligature. We don't have a way of determining whether a terminal can display ligatures. Increasingly, terminal emulators acquire these capabilities, and we have already a couple that display ligatures and Emoji sequences. But there are no methods known to us to query the terminal whether such support exists and/or which ligatures are supported. The user can disable auto-composition-mode or customize composition-function-table to disable some or all of the text-shaping features. > I doubt any user wants to see a diamond instead of `fi'. Is this what really happens for you, on your terminal?