From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.bugs Subject: bug#37213: Execute set-window-margins. left-margin-width remains 0. Date: Sun, 1 Sep 2019 09:48:45 +0000 Message-ID: <20190901094844.GB16279@ACM> References: <20190828185352.GA4530@ACM> <83r255ayq9.fsf@gnu.org> <20190828195706.GB4530@ACM> <263050b1-8a57-dd39-bd49-88913935f96e@gmx.at> <20190831140736.GE4822@ACM> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="231984"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Mutt/1.10.1 (2018-07-13) Cc: 37213@debbugs.gnu.org To: martin rudalics Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Sep 01 11:49:12 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1i4MTv-000y8A-VN for geb-bug-gnu-emacs@m.gmane.org; Sun, 01 Sep 2019 11:49:12 +0200 Original-Received: from localhost ([::1]:56214 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i4MTu-0004aG-7d for geb-bug-gnu-emacs@m.gmane.org; Sun, 01 Sep 2019 05:49:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35920) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i4MTn-0004aA-Pg for bug-gnu-emacs@gnu.org; Sun, 01 Sep 2019 05:49:04 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i4MTm-0002gT-Ou for bug-gnu-emacs@gnu.org; Sun, 01 Sep 2019 05:49:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:47374) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1i4MTm-0002gC-Li for bug-gnu-emacs@gnu.org; Sun, 01 Sep 2019 05:49:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1i4MTm-0007Ex-HX for bug-gnu-emacs@gnu.org; Sun, 01 Sep 2019 05:49:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Alan Mackenzie Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 01 Sep 2019 09:49:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 37213 X-GNU-PR-Package: emacs Original-Received: via spool by 37213-submit@debbugs.gnu.org id=B37213.156733133027813 (code B ref 37213); Sun, 01 Sep 2019 09:49:02 +0000 Original-Received: (at 37213) by debbugs.gnu.org; 1 Sep 2019 09:48:50 +0000 Original-Received: from localhost ([127.0.0.1]:56195 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1i4MTa-0007EX-1U for submit@debbugs.gnu.org; Sun, 01 Sep 2019 05:48:50 -0400 Original-Received: from colin.muc.de ([193.149.48.1]:18702 helo=mail.muc.de) by debbugs.gnu.org with smtp (Exim 4.84_2) (envelope-from ) id 1i4MTX-0007EN-KV for 37213@debbugs.gnu.org; Sun, 01 Sep 2019 05:48:48 -0400 Original-Received: (qmail 23691 invoked by uid 3782); 1 Sep 2019 08:55:54 -0000 Original-Received: from acm.muc.de (p2E5D5064.dip0.t-ipconnect.de [46.93.80.100]) by colin.muc.de (tmda-ofmipd) with ESMTP; Sun, 01 Sep 2019 10:55:53 +0200 Original-Received: (qmail 17865 invoked by uid 1000); 1 Sep 2019 09:48:45 -0000 Content-Disposition: inline In-Reply-To: X-Delivery-Agent: TMDA/1.1.12 (Macallan) X-Primary-Address: acm@muc.de X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:166131 Archived-At: Hello, Martin. On Sun, Sep 01, 2019 at 10:26:35 +0200, martin rudalics wrote: > > Is the read value well-defined? Never having set it, the value it has > > seems always to be 0. > All margin-related values are zero by default. > > But even if it is well-defined, is it useful for > > anything? > To keep you informed about the sizes of the margins of a window > whenever the buffer will be shown in it via 'set-window-buffer'. OK. It seems there are two alternative strategies for manipulating a window's margins. One is to use set-window-margins together with window-margins, the other is to use left/right-margin-width and set-window-buffer. > > Yes, that's the thing. We don't have "window local variables" in Emacs, > > so anything specific to a window needs a function interface with the > > window being one of the parameters. > Right. Windows behave like frames in this regard. > > I've proposed a simple amendment to the "Display Margins" page of the > > elisp manual, saying "don't use these variables to ....!". This would > > solve the misunderstanding I experienced earlier. > Hmm... What is the "current width of the left or right margin"? I'm not sure I understand the question. In a given window with a left margin, there will be a maximum length of string which can be displayed in that margin. That is its "current width". The same for a right margin. What are you getting at, here? > martin -- Alan Mackenzie (Nuremberg, Germany).