From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#12170: save-excursion fails boundary case with recenter Date: Fri, 10 Aug 2012 12:18:08 -0400 Message-ID: References: <000001cd7696$b0e93d60$12bbb820$@com> <5024D593.7080305@gmx.at> <003601cd76fd$b21cd590$165680b0$@com> <50251EED.3010804@gmx.at> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1344615537 10004 80.91.229.3 (10 Aug 2012 16:18:57 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 10 Aug 2012 16:18:57 +0000 (UTC) Cc: 12170@debbugs.gnu.org, Bill Brodie To: martin rudalics Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Aug 10 18:18:57 2012 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 1SzrvI-0004ih-Rz for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Aug 2012 18:18:52 +0200 Original-Received: from localhost ([::1]:36158 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SzrvI-0007VA-1E for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Aug 2012 12:18:52 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:48772) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SzrvE-0007UX-1Y for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 12:18:49 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SzrvB-0004cB-V1 for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 12:18:47 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:37645) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SzrvB-0004c1-QZ for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 12:18:45 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1Szs3B-0000LN-Ka for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 12:27:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 10 Aug 2012 16:27:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 12170 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 12170-submit@debbugs.gnu.org id=B12170.13446159891284 (code B ref 12170); Fri, 10 Aug 2012 16:27:01 +0000 Original-Received: (at 12170) by debbugs.gnu.org; 10 Aug 2012 16:26:29 +0000 Original-Received: from localhost ([127.0.0.1]:47191 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1Szs2e-0000Ke-A3 for submit@debbugs.gnu.org; Fri, 10 Aug 2012 12:26:28 -0400 Original-Received: from pruche.dit.umontreal.ca ([132.204.246.22]:44733) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1Szs2b-0000KY-Vb for 12170@debbugs.gnu.org; Fri, 10 Aug 2012 12:26:26 -0400 Original-Received: from faina.iro.umontreal.ca (lechon.iro.umontreal.ca [132.204.27.242]) by pruche.dit.umontreal.ca (8.14.1/8.14.1) with ESMTP id q7AGI8tK004898; Fri, 10 Aug 2012 12:18:09 -0400 Original-Received: by faina.iro.umontreal.ca (Postfix, from userid 20848) id B61BAB4177; Fri, 10 Aug 2012 12:18:08 -0400 (EDT) In-Reply-To: <50251EED.3010804@gmx.at> (martin rudalics's message of "Fri, 10 Aug 2012 16:47:09 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux) X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 1 Rules triggered RV4306=0 X-NAI-Spam-Version: 2.2.0.9309 : core <4306> : streams <797228> : uri <1188987> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) 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:63008 Archived-At: > But I don't have the slightest idea how calling > (set-window-start (selected-window) ,start t) > would remedy this. Eli will soon teach us a lesson here. The redisplay tries to make sure (window-)point is visible, which can either be done by changing (window-)point or by changing window-start. The first happens when you use a scrolling operation (which sets window-start), the other happens in response to normal navigation in the buffer. Knowing which to do when is not obvious, but IIUC if window-start has not been changed, then the redisplay assumes that it is free to change (window-)point, whereas otherwise it will assume that it should not change (window-)point but can instead change window-start. Stefan