From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: martin rudalics Newsgroups: gmane.emacs.bugs Subject: bug#12170: save-excursion fails boundary case with recenter Date: Fri, 10 Aug 2012 11:34:11 +0200 Message-ID: <5024D593.7080305@gmx.at> References: <000001cd7696$b0e93d60$12bbb820$@com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1344591307 4390 80.91.229.3 (10 Aug 2012 09:35:07 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 10 Aug 2012 09:35:07 +0000 (UTC) Cc: 12170@debbugs.gnu.org To: Bill Brodie Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Aug 10 11:35:06 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 1SzlcQ-0003Ha-7L for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Aug 2012 11:34:58 +0200 Original-Received: from localhost ([::1]:48357 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SzlcP-0004Wr-C6 for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Aug 2012 05:34:57 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:45823) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SzlcJ-0004RY-Il for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 05:34:53 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SzlcG-0002lD-Lm for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 05:34:51 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:36490) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SzlcG-0002l9-II for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 05:34:48 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1SzlkE-0006wH-RY for bug-gnu-emacs@gnu.org; Fri, 10 Aug 2012 05:43:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: martin rudalics Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 10 Aug 2012 09:43:02 +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=B12170.134459175526628 (code B ref 12170); Fri, 10 Aug 2012 09:43:02 +0000 Original-Received: (at 12170) by debbugs.gnu.org; 10 Aug 2012 09:42:35 +0000 Original-Received: from localhost ([127.0.0.1]:46034 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1Szljm-0006vR-Q6 for submit@debbugs.gnu.org; Fri, 10 Aug 2012 05:42:35 -0400 Original-Received: from mailout-de.gmx.net ([213.165.64.22]:36870) by debbugs.gnu.org with smtp (Exim 4.72) (envelope-from ) id 1Szljk-0006vK-Ih for 12170@debbugs.gnu.org; Fri, 10 Aug 2012 05:42:33 -0400 Original-Received: (qmail invoked by alias); 10 Aug 2012 09:34:17 -0000 Original-Received: from 62-47-36-71.adsl.highway.telekom.at (EHLO [62.47.36.71]) [62.47.36.71] by mail.gmx.net (mp012) with SMTP; 10 Aug 2012 11:34:17 +0200 X-Authenticated: #14592706 X-Provags-ID: V01U2FsdGVkX1+gHZFhDImgKTtDQsype5h85S+8P0XfURrDYybhx/ WprE47Xb+LuZCo In-Reply-To: <000001cd7696$b0e93d60$12bbb820$@com> X-Y-GMX-Trusted: 0 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:62996 Archived-At: > (defun f (n) (save-excursion (forward-line (- n)) (recenter > 0))) > > > > Let H be the window height in lines, and suppose that point is positioned at > the beginning of line L > H. > > > > Despite 'save-excursion', (f K) moves point if K = H. It leaves point > unchanged for any other value of K, 0 <= K < L. I'm not sure whether I clearly understand your scenario. Suppose with emacs -Q I evaluate (progn (defun f (n) (save-excursion (forward-line (- n)) (recenter 0))) (let ((buffer (switch-to-buffer "foo")) (height (window-height (get-buffer-window "foo")))) (insert-char 10 (* height 2)) (let ((pt (point))) (f height) (message "old %s new %s" pt (point))))) Then the values printed by the message are equal. Please elaborate. Thanks, martin