From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.help Subject: Re: changing the display of formfeed characters Date: Sat, 01 Sep 2018 16:51:51 +0300 Message-ID: <83tvn91g20.fsf@gnu.org> References: NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1535809829 23693 195.159.176.226 (1 Sep 2018 13:50:29 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 1 Sep 2018 13:50:29 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Sep 01 15:50:25 2018 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fw6IC-00063Z-QJ for geh-help-gnu-emacs@m.gmane.org; Sat, 01 Sep 2018 15:50:24 +0200 Original-Received: from localhost ([::1]:37261 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fw6KJ-0004AR-92 for geh-help-gnu-emacs@m.gmane.org; Sat, 01 Sep 2018 09:52:35 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48438) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fw6Js-00048E-6d for help-gnu-emacs@gnu.org; Sat, 01 Sep 2018 09:52:10 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fw6Jo-0004HZ-4x for help-gnu-emacs@gnu.org; Sat, 01 Sep 2018 09:52:08 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:59532) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fw6Jo-0004HT-0y for help-gnu-emacs@gnu.org; Sat, 01 Sep 2018 09:52:04 -0400 Original-Received: from [176.228.60.248] (port=3858 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1fw6Jn-0002ht-Ha for help-gnu-emacs@gnu.org; Sat, 01 Sep 2018 09:52:04 -0400 In-reply-to: (message from Javier on Fri, 31 Aug 2018 11:22:59 +0000 (UTC)) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:117805 Archived-At: > From: Javier > Date: Fri, 31 Aug 2018 11:22:59 +0000 (UTC) > > There are several suggested ways to display form feed (^L) > > http://www.emacswiki.org/emacs/PageBreaks > http://www.emacswiki.org/emacs/PrettyControlL > https://www.emacswiki.org/emacs/pp-c-l.el > http://ergoemacs.org/emacs/modernization_formfeed.html > > However all them break whitespace-mode. Is there a way to display > formfeed ^L without interfering with whitespace-mode? > > The issue has been known for long time. > > http://lists.gnu.org/archive/html/help-gnu-emacs/2011-03/msg00891.html > https://www.emacswiki.org/emacs/pp-c-l.el > > Has somebody come with any idea how to display ^L in some way without > breaking whitespace-mode? AFAICT, those modes break whitespace-mode because they define their own display table without copying the display table that was in effect before the mode was switched on. whitespace-mode does take care of copying the previous display table, and doesn't override the way the formfeed is displayed AFAICS. So maybe activating those other modes _before_ whitespace-mode will do the trick? (Caveat: I didn't try that.) > Would it do the trick modifying the display table for ^L with a fixed width string? > Like "=========" and avoiding to dynamically adjust for window width. Not sure how this question is related, please elaborate.