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: (insert ?\n) spuriously calls before-change-functions twice. Help! Date: Tue, 5 Jan 2010 11:09:54 +0000 Message-ID: <20100105110954.GA2639@muc.de> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1262689454 15409 80.91.229.12 (5 Jan 2010 11:04:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 5 Jan 2010 11:04:14 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Jan 05 12:04:06 2010 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from terminus-est.gnu.org ([66.92.78.210] helo=lists.gnu.org) by lo.gmane.org with esmtp (Exim 4.50) id 1NS7Cn-0003YZ-Qf for ged-emacs-devel@m.gmane.org; Tue, 05 Jan 2010 12:04:06 +0100 Original-Received: from localhost ([127.0.0.1]:36655 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NS7Cl-0005ap-Gm for ged-emacs-devel@m.gmane.org; Tue, 05 Jan 2010 06:04:03 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NS7Cb-0005Ym-75 for emacs-devel@gnu.org; Tue, 05 Jan 2010 06:03:53 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NS7CU-0005So-Pp for emacs-devel@gnu.org; Tue, 05 Jan 2010 06:03:51 -0500 Original-Received: from [199.232.76.173] (port=41245 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NS7CU-0005Sa-JD for emacs-devel@gnu.org; Tue, 05 Jan 2010 06:03:46 -0500 Original-Received: from colin.muc.de ([193.149.48.1]:3369 helo=mail.muc.de) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NS7CT-0006eQ-L1 for emacs-devel@gnu.org; Tue, 05 Jan 2010 06:03:46 -0500 Original-Received: (qmail 20781 invoked by uid 3782); 5 Jan 2010 11:03:42 -0000 Original-Received: from acm.muc.de (pD9E506C5.dip.t-dialin.net [217.229.6.197]) by colin2.muc.de (tmda-ofmipd) with ESMTP; Tue, 05 Jan 2010 12:03:41 +0100 Original-Received: (qmail 2865 invoked by uid 1000); 5 Jan 2010 11:09:54 -0000 Content-Disposition: inline User-Agent: Mutt/1.5.9i X-Delivery-Agent: TMDA/1.1.5 (Fettercairn) X-Primary-Address: acm@muc.de X-detected-operating-system: by monty-python.gnu.org: FreeBSD 4.6-4.9 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:119425 Archived-At: Hi, Emacs. The following is a partial diagnosis of a bug reported by an AWK user. (AWK Mode throws an error when require-final-newline is t). In emacs -Q, in an AWK buffer, do M-: (insert ?\n). The following happens: 1. before-change-functions is invoked with arguments (beg end) (16 16). 2. The NL is inserted at position 16. 3. before-change-functions is invoked with arguments (16 17). This all happens before after-change-functions is invoked. However, M-: (insert "\n") just does the Right Thing. This second invocation of before-change-functions is surely a bug. I can make this happen in a Fundamental Mode buffer in my normal Emacs session, but not in Emacs -Q. What is causing this spurious invocation? Does anybody have any idea? I've perused the C source for `insert', without finding anything. Could it be anything to do with text-properties? Thanks for the help! -- Alan Mackenzie (Nuremberg, Germany).