From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: "... the window start at a meaningless point within a line." Date: Fri, 16 Oct 2015 18:12:50 +0000 Message-ID: <20151016181249.GC2779@acm.fritz.box> References: <20150930204513.GA3174@acm.fritz.box> <83mvw39dp3.fsf@gnu.org> <20151001094138.GA2515@acm.fritz.box> <83h9maao7w.fsf@gnu.org> <20151001110204.GB2515@acm.fritz.box> <83egheaj9e.fsf@gnu.org> <20151015181642.GA6467@acm.fritz.box> <834mhr99e8.fsf@gnu.org> <20151016095535.GA2779@acm.fritz.box> <83a8ri67jg.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1445019107 8915 80.91.229.3 (16 Oct 2015 18:11:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 16 Oct 2015 18:11:47 +0000 (UTC) Cc: emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Oct 16 20:11:39 2015 Return-path: Envelope-to: ged-emacs-devel@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 1Zn9Tc-0003ZI-Ue for ged-emacs-devel@m.gmane.org; Fri, 16 Oct 2015 20:11:37 +0200 Original-Received: from localhost ([::1]:55289 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zn9Tc-0008Jz-JA for ged-emacs-devel@m.gmane.org; Fri, 16 Oct 2015 14:11:36 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:57800) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zn9TJ-0007ti-Tv for emacs-devel@gnu.org; Fri, 16 Oct 2015 14:11:18 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zn9TG-0002QX-NF for emacs-devel@gnu.org; Fri, 16 Oct 2015 14:11:17 -0400 Original-Received: from mail.muc.de ([193.149.48.3]:29031) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zn9TG-0002QF-Dg for emacs-devel@gnu.org; Fri, 16 Oct 2015 14:11:14 -0400 Original-Received: (qmail 45172 invoked by uid 3782); 16 Oct 2015 18:11:13 -0000 Original-Received: from acm.muc.de (p5B14790D.dip0.t-ipconnect.de [91.20.121.13]) by colin.muc.de (tmda-ofmipd) with ESMTP; Fri, 16 Oct 2015 20:11:12 +0200 Original-Received: (qmail 8470 invoked by uid 1000); 16 Oct 2015 18:12:50 -0000 Content-Disposition: inline In-Reply-To: <83a8ri67jg.fsf@gnu.org> User-Agent: Mutt/1.5.23 (2014-03-12) X-Delivery-Agent: TMDA/1.1.12 (Macallan) X-Primary-Address: acm@muc.de X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-Received-From: 193.149.48.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:191782 Archived-At: Hello, Eli. On Fri, Oct 16, 2015 at 08:35:15PM +0300, Eli Zaretskii wrote: > > Date: Fri, 16 Oct 2015 09:55:35 +0000 > > Cc: emacs-devel@gnu.org > > From: Alan Mackenzie > > B---WS-----------------A---L2-------------A2---L3---------\nC-------C2--- > > When Fvertical_motion runs, it first sets its struct it "it" to a BOL, then > > possibly moves it to the appropriate column. Between these two actions, > > maybe_move_to_exact_bol reseats `it' from an xdisp BOL to an exact BOL, or > > sometimes from a common BOL to an earlier or later BOL. > But why do you need to do that? IOW, what problem does > maybe_move_to_exact_bol solve, and how that problem is related to what > Fvertical_motion does? > Perhaps start by explaining what problems you discovered in > Fvertical_motion that required you to make those changes. Without maybe_move_to_exact_bol, vertical-motion, when it lands near the top of the window, leaves the cursor not at column 0 on the screen. So, for example, with point at C, unmodified (vertical-motion -1) takes us to A2, when we want to go to L3. > Thanks. -- Alan Mackenzie (Nuremberg, Germany).