From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#18441: whitespace-mode sometimes adds column to tab character Date: Sat, 04 Sep 2021 09:57:33 +0200 Message-ID: <87y28crcwi.fsf_-_@gnus.org> References: <87a8myz9fq.fsf@mbork.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6453"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Mario Valencia , 18441@debbugs.gnu.org To: Marcin Borkowski Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Sep 04 09:58:09 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1mMQYy-0001Uk-V3 for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 04 Sep 2021 09:58:08 +0200 Original-Received: from localhost ([::1]:56728 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMQYx-0003BR-SA for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 04 Sep 2021 03:58:07 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:38992) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mMQYs-0003B3-1R for bug-gnu-emacs@gnu.org; Sat, 04 Sep 2021 03:58:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:34986) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mMQYr-0003oo-Q9 for bug-gnu-emacs@gnu.org; Sat, 04 Sep 2021 03:58:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mMQYr-0007yi-Nx for bug-gnu-emacs@gnu.org; Sat, 04 Sep 2021 03:58:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Lars Ingebrigtsen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 04 Sep 2021 07:58:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18441 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: confirmed Original-Received: via spool by 18441-submit@debbugs.gnu.org id=B18441.163074226830645 (code B ref 18441); Sat, 04 Sep 2021 07:58:01 +0000 Original-Received: (at 18441) by debbugs.gnu.org; 4 Sep 2021 07:57:48 +0000 Original-Received: from localhost ([127.0.0.1]:46532 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mMQYd-0007yD-Sk for submit@debbugs.gnu.org; Sat, 04 Sep 2021 03:57:48 -0400 Original-Received: from quimby.gnus.org ([95.216.78.240]:38772) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mMQYc-0007y0-4Z for 18441@debbugs.gnu.org; Sat, 04 Sep 2021 03:57:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID :In-Reply-To:Date:References:Subject:Cc:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=wU+JHv4u990LCaq2lwrMA1RaT0urX6YnY0P3/y5AIYk=; b=tJ7OtHr3TllGPrO1lrucBI00QI /E+zN3mx84wXP9Sf9MUiX1IOlGa0+/Gb5WscekZ+IC/sWSGr92AQajouOOHhGMruGI/Sa1N/z5ceo 4qo7rpw8tQALd8sfIP8ezXQMRCF8LQXzTQSh3zOYACk3FLMn67CtcOXaXb3chbCryfnE=; Original-Received: from [84.212.220.105] (helo=elva) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mMQYP-0006wH-Kd; Sat, 04 Sep 2021 09:57:36 +0200 In-Reply-To: <87a8myz9fq.fsf@mbork.pl> (Marcin Borkowski's message of "Thu, 18 Feb 2016 09:53:13 +0100") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:213398 Archived-At: Marcin Borkowski writes: >> well it appears to be a known problem, as commented in the source of >> whitespace-mode. I can confirm that this bug is still present in Emacs 28. > To be more precise, the comment Mario meant is probably this part of > definition of `whitespace-display-mappings': > > ;; WARNING: the mapping below has a problem. > ;; When a TAB occupies exactly one column, it will display the > ;; character ?\xBB at that column followed by a TAB which goes to > ;; the next TAB column. > ;; If this is a problem for you, please, comment the line below. > (tab-mark ?\t [?=C2=BB ?\t] [?\\ ?\t]) ; tab - right guillemet > > Does anyone know why the workaround given there is not turned on by > default? Or maybe it should be made a user option? If that mark is removed, then tabs won't be marked specially at all -- only with a background colour, which is presumably not what people want here... Looking at the whitespace code, I don't really see any easy way to fix this -- the buffer display table and tab actions don't match? --=20 (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no