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: Fri, 11 Jan 2019 09:03:55 +0200 Message-ID: <83sgxzhe04.fsf@gnu.org> References: NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1547190189 6355 195.159.176.226 (11 Jan 2019 07:03:09 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 11 Jan 2019 07:03:09 +0000 (UTC) Cc: 34038@debbugs.gnu.org To: Markus Triska Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Jan 11 08:03:05 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 1ghqqP-0001WY-6Q for geb-bug-gnu-emacs@m.gmane.org; Fri, 11 Jan 2019 08:03:05 +0100 Original-Received: from localhost ([127.0.0.1]:32931 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghqsV-00036N-TY for geb-bug-gnu-emacs@m.gmane.org; Fri, 11 Jan 2019 02:05:15 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:34279) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghqsO-00034e-S1 for bug-gnu-emacs@gnu.org; Fri, 11 Jan 2019 02:05:09 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghqsJ-0000XD-4B for bug-gnu-emacs@gnu.org; Fri, 11 Jan 2019 02:05:08 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:55169) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ghqsI-0000W7-UC for bug-gnu-emacs@gnu.org; Fri, 11 Jan 2019 02:05:03 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1ghqsI-0002wN-AP for bug-gnu-emacs@gnu.org; Fri, 11 Jan 2019 02:05:02 -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, 11 Jan 2019 07:05:02 +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=B34038.154719024911236 (code B ref 34038); Fri, 11 Jan 2019 07:05:02 +0000 Original-Received: (at 34038) by debbugs.gnu.org; 11 Jan 2019 07:04:09 +0000 Original-Received: from localhost ([127.0.0.1]:54449 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ghqrR-0002v9-1F for submit@debbugs.gnu.org; Fri, 11 Jan 2019 02:04:09 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:52132) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ghqrM-0002ud-Jm for 34038@debbugs.gnu.org; Fri, 11 Jan 2019 02:04:07 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:55781) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghqrG-0008Qi-Sj; Fri, 11 Jan 2019 02:03:58 -0500 Original-Received: from [176.228.60.248] (port=2860 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1ghqrG-00041q-Bk; Fri, 11 Jan 2019 02:03:58 -0500 In-reply-to: (message from Markus Triska on Thu, 10 Jan 2019 20:57:28 +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:154332 Archived-At: > From: Markus Triska > Date: Thu, 10 Jan 2019 20:57:28 +0100 > > 1) inserts several (i.e, window-height) lines into the buffer > 2) sets window point to p, which is point after (1) > 3) WAITS FOR A KEY PRESS (please press a key at this point) > 4) erases and restores the buffer contents > 5) sets window point to p, the same point as in (2) > > However, in many invocations (please try it repeatedly if necessary), > the visible portion of the buffer unexpectedly differs between (3) and > after the whole procedure. > > In other words, when Emacs waits for a key press, a different portion of > the buffer is visible compared to after you press a key, even though > window-start is set to the same position in both cases. > > Is there a way to reliably set the window-start in such situations? I think this happens because you call set-window-start with last argument non-nil. Doing that tells the display engine that the window-start point is just a suggestion, not a hard requirement.