From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#34038: 26.1; set-window-start sometimes fails to set window start Date: Sun, 13 Jan 2019 17:21:00 +0200 Message-ID: <83tviceg83.fsf@gnu.org> References: <83sgxzhe04.fsf@gnu.org> <87ef9je67i.fsf@metalevel.at> <20190111212357.GA5201@ACM> <87h8edt3kz.fsf@metalevel.at> <5C3AF974.1030906@gmx.at> <5029BB09-30CA-41BE-819D-E15101DCF38C@gnu.org> <5C3B3FCC.8080006@gmx.at> NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1547392810 17325 195.159.176.226 (13 Jan 2019 15:20:10 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 13 Jan 2019 15:20:10 +0000 (UTC) Cc: acm@muc.de, 34038@debbugs.gnu.org, Markus Triska To: martin rudalics Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Jan 13 16:20:06 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gihYT-0004MP-9J for geb-bug-gnu-emacs@m.gmane.org; Sun, 13 Jan 2019 16:20:05 +0100 Original-Received: from localhost ([127.0.0.1]:34747 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gihaa-0007G1-5f for geb-bug-gnu-emacs@m.gmane.org; Sun, 13 Jan 2019 10:22:16 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:51456) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gihaN-0007E2-6L for bug-gnu-emacs@gnu.org; Sun, 13 Jan 2019 10:22:03 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gihaM-0000ai-JY for bug-gnu-emacs@gnu.org; Sun, 13 Jan 2019 10:22:03 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:58687) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gihaM-0000ad-G5 for bug-gnu-emacs@gnu.org; Sun, 13 Jan 2019 10:22:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1gihaM-0007jD-At for bug-gnu-emacs@gnu.org; Sun, 13 Jan 2019 10:22:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 13 Jan 2019 15:22:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 34038 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 34038-submit@debbugs.gnu.org id=B34038.154739288629664 (code B ref 34038); Sun, 13 Jan 2019 15:22:02 +0000 Original-Received: (at 34038) by debbugs.gnu.org; 13 Jan 2019 15:21:26 +0000 Original-Received: from localhost ([127.0.0.1]:57968 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gihZm-0007iN-4B for submit@debbugs.gnu.org; Sun, 13 Jan 2019 10:21:26 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:41117) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gihZk-0007i9-Hd for 34038@debbugs.gnu.org; Sun, 13 Jan 2019 10:21:24 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:56280) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gihZe-0000Np-5V; Sun, 13 Jan 2019 10:21:18 -0500 Original-Received: from [176.228.60.248] (port=1444 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1gihZd-0005o6-N0; Sun, 13 Jan 2019 10:21:18 -0500 In-reply-to: <5C3B3FCC.8080006@gmx.at> (message from martin rudalics on Sun, 13 Jan 2019 14:40:28 +0100) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 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" Xref: news.gmane.org gmane.emacs.bugs:154411 Archived-At: > Date: Sun, 13 Jan 2019 14:40:28 +0100 > From: martin rudalics > CC: 34038@debbugs.gnu.org > > > There's no bug here: Emacs by default avoids starting a window's > > display at EOB. Scroll-conservatively overrides that. > > AFAICT a first redisplay tries to obey a forced 'window-start' at EOB. > A subsequent redisplay_preserve_echo_area, however, has forgotten the > force_start and recenters the window. Yes. > Which means that force_start is pretty ephemeral. It's ephemeral if it leaves the window in a state which will make subsequent redisplay unhappy. Which is what this recipe triggers.