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#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window Date: Fri, 13 Dec 2013 17:32:22 +0200 Message-ID: <8338lw6a2h.fsf@gnu.org> References: Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1386948797 25453 80.91.229.3 (13 Dec 2013 15:33:17 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 13 Dec 2013 15:33:17 +0000 (UTC) Cc: 16129@debbugs.gnu.org To: Anders Lindgren Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Dec 13 16:33:22 2013 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 1VrUjw-0004OQ-Er for geb-bug-gnu-emacs@m.gmane.org; Fri, 13 Dec 2013 16:33:20 +0100 Original-Received: from localhost ([::1]:43150 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VrUjw-0006ny-01 for geb-bug-gnu-emacs@m.gmane.org; Fri, 13 Dec 2013 10:33:20 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:51281) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VrUjm-0006nH-1x for bug-gnu-emacs@gnu.org; Fri, 13 Dec 2013 10:33:17 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VrUje-0001iP-L6 for bug-gnu-emacs@gnu.org; Fri, 13 Dec 2013 10:33:09 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:34643) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VrUje-0001iJ-In for bug-gnu-emacs@gnu.org; Fri, 13 Dec 2013 10:33:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1VrUjd-0004Yl-RO for bug-gnu-emacs@gnu.org; Fri, 13 Dec 2013 10:33:02 -0500 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 Dec 2013 15:33:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 16129 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 16129-submit@debbugs.gnu.org id=B16129.138694874917459 (code B ref 16129); Fri, 13 Dec 2013 15:33:01 +0000 Original-Received: (at 16129) by debbugs.gnu.org; 13 Dec 2013 15:32:29 +0000 Original-Received: from localhost ([127.0.0.1]:48662 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VrUj5-0004XV-JD for submit@debbugs.gnu.org; Fri, 13 Dec 2013 10:32:28 -0500 Original-Received: from mtaout22.012.net.il ([80.179.55.172]:57048) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VrUj2-0004XL-7m for 16129@debbugs.gnu.org; Fri, 13 Dec 2013 10:32:25 -0500 Original-Received: from conversion-daemon.a-mtaout22.012.net.il by a-mtaout22.012.net.il (HyperSendmail v2007.08) id <0MXR00E004BPXM00@a-mtaout22.012.net.il> for 16129@debbugs.gnu.org; Fri, 13 Dec 2013 17:32:22 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout22.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0MXR00EPU4HYMGA0@a-mtaout22.012.net.il>; Fri, 13 Dec 2013 17:32:22 +0200 (IST) 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:81881 Archived-At: > Date: Fri, 13 Dec 2013 15:34:07 +0100 > From: Anders Lindgren > > I am the original author of follow-mode, so I can share one interesting > implementation detail. When the viewed buffer ends before the last window, > follow-mode tries to display this window without any content (by setting > the window start to point-max). Unfortunately, the Emacs display engine > always tries ensure that windows are not empty so it repositions it... You cannot have window-start and point-max, sorry. Remember: point-max is a buffer position that doesn't really exist, it's beyond the end of buffer text. So it cannot be treated as any other buffer position.