From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#17678: 24.4.50; Feature Request -- calculate new `window-start` & `window-end` before visual redisplay Date: Fri, 13 Jun 2014 09:22:23 +0300 Message-ID: <8361k5xra8.fsf@gnu.org> References: <831tuvz3n8.fsf@gnu.org> <83ha3qxbcc.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1402640604 13534 80.91.229.3 (13 Jun 2014 06:23:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 13 Jun 2014 06:23:24 +0000 (UTC) Cc: esq@lawlist.com, 17678@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Jun 13 08:23:17 2014 Return-path: Envelope-to: geb-bug-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 1WvKtP-0005Pe-DS for geb-bug-gnu-emacs@m.gmane.org; Fri, 13 Jun 2014 08:23:15 +0200 Original-Received: from localhost ([::1]:56948 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WvKtO-0006j1-O0 for geb-bug-gnu-emacs@m.gmane.org; Fri, 13 Jun 2014 02:23:14 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39245) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WvKtH-0006i4-8B for bug-gnu-emacs@gnu.org; Fri, 13 Jun 2014 02:23:12 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WvKtC-0001sr-Ct for bug-gnu-emacs@gnu.org; Fri, 13 Jun 2014 02:23:07 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:54956) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WvKtC-0001sn-9a for bug-gnu-emacs@gnu.org; Fri, 13 Jun 2014 02:23:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1WvKtB-00036L-LU for bug-gnu-emacs@gnu.org; Fri, 13 Jun 2014 02:23:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 13 Jun 2014 06:23:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17678 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 17678-submit@debbugs.gnu.org id=B17678.140264056411889 (code B ref 17678); Fri, 13 Jun 2014 06:23:01 +0000 Original-Received: (at 17678) by debbugs.gnu.org; 13 Jun 2014 06:22:44 +0000 Original-Received: from localhost ([127.0.0.1]:46106 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WvKsu-00035h-G1 for submit@debbugs.gnu.org; Fri, 13 Jun 2014 02:22:44 -0400 Original-Received: from mtaout27.012.net.il ([80.179.55.183]:50400) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WvKss-00035P-5k for 17678@debbugs.gnu.org; Fri, 13 Jun 2014 02:22:43 -0400 Original-Received: from conversion-daemon.mtaout27.012.net.il by mtaout27.012.net.il (HyperSendmail v2007.08) id <0N7300N00FS97C00@mtaout27.012.net.il> for 17678@debbugs.gnu.org; Fri, 13 Jun 2014 09:19:34 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout27.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N7300LLBG8M4I40@mtaout27.012.net.il>; Fri, 13 Jun 2014 09:19:34 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:90307 Archived-At: > From: Stefan Monnier > Cc: esq@lawlist.com, 17678@debbugs.gnu.org > Date: Thu, 12 Jun 2014 22:11:39 -0400 > > >> > The display engine changes window-start for several reasons, only one > >> > of them being that point moved off screen. > >> Is there a comment somewhere that documents the cases where it can happen? > > Not that I know of. > > In general, there are functions that set the window-start forcibly. > > I know of code that does that from outside of redisplay, but within > redisplay I only know of the "move point back into view". Why does it matter if the trigger comes from outside redisplay or as part of redisplay? Anyway, one situation of the latter kind is when the text at window-start changed. Another one is when the window-start was in a continuation line, and the window width changed, see compute_window_start_on_continuation_line and its callers.