From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.help Subject: Re: relative line numbers and folding: how to make they play along? Date: Thu, 14 Jul 2016 18:06:26 +0300 Message-ID: <83bn208djh.fsf@gnu.org> References: <8360sbcvbz.fsf@gnu.org> <83lh158eza.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1468509865 12112 80.91.229.3 (14 Jul 2016 15:24:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 14 Jul 2016 15:24:25 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Jul 14 17:24:11 2016 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bNiUe-00041J-Pr for geh-help-gnu-emacs@m.gmane.org; Thu, 14 Jul 2016 17:24:04 +0200 Original-Received: from localhost ([::1]:54786 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNiUd-0008Kq-QR for geh-help-gnu-emacs@m.gmane.org; Thu, 14 Jul 2016 11:24:03 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:50365) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNiDq-0003BS-Mx for help-gnu-emacs@gnu.org; Thu, 14 Jul 2016 11:06:43 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bNiDn-0005SN-LN for help-gnu-emacs@gnu.org; Thu, 14 Jul 2016 11:06:41 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:44673) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNiDn-0005S7-IJ for help-gnu-emacs@gnu.org; Thu, 14 Jul 2016 11:06:39 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:1760 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1bNiDl-0000Qn-Ou for help-gnu-emacs@gnu.org; Thu, 14 Jul 2016 11:06:38 -0400 In-reply-to: (message from Stefan Monnier on Wed, 13 Jul 2016 22:36:49 -0400) 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:110840 Archived-At: > From: Stefan Monnier > Date: Wed, 13 Jul 2016 22:36:49 -0400 > > >> I think to implement relative-visual-linum-mode efficiently, we'd need > >> help from the display engine. E.g.: > >> - First perform redisplay of the window. > >> - then, go through the window, visual-line by visual-line > >> and add something in the margin. > >> - then update the margin part of the matrices. > > > AFAIU, this would cause a momentary flickering of an incorrect display > > (without the line numbers), until they are computed and displayed. > > Actually, I don't think there needs to be flickering if the first step > ("perform redisplay of window") just computes the new matrices without > performing any drawing. Since the display engine computes the number of each screen line as it lays them out, I don't understand why would 2 phases be needed. I'm probably missing something. > > And I still don't see any answer to my question, alas. > > It's basically: linum-mode but where the line numbers are relative to > `point` rather than counting from `point-min`, and additionally it > should count visual lines (so 10 invisible lines of text don't affect > the line numbers of the text that is displayed). So some lines will have negative numbers? And they change whenever point moves into a different line? And when the window is scrolled, the numbers also change?