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#22395: 25.0.50; 'C-v' scrolls only a half of the window height Date: Mon, 18 Jan 2016 18:25:24 +0200 Message-ID: <83y4bmdfd7.fsf@gnu.org> References: Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1453134391 27111 80.91.229.3 (18 Jan 2016 16:26:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 18 Jan 2016 16:26:31 +0000 (UTC) Cc: 22395-done@debbugs.gnu.org To: Dani Moncayo Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Jan 18 17:26:21 2016 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 1aLCdC-0004i0-Ry for geb-bug-gnu-emacs@m.gmane.org; Mon, 18 Jan 2016 17:26:14 +0100 Original-Received: from localhost ([::1]:60612 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aLCd8-0000G8-O8 for geb-bug-gnu-emacs@m.gmane.org; Mon, 18 Jan 2016 11:26:10 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39360) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aLCd3-0000El-Ox for bug-gnu-emacs@gnu.org; Mon, 18 Jan 2016 11:26:06 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aLCd0-0002MO-Ir for bug-gnu-emacs@gnu.org; Mon, 18 Jan 2016 11:26:05 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:36594) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aLCd0-0002MA-G0 for bug-gnu-emacs@gnu.org; Mon, 18 Jan 2016 11:26:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84) (envelope-from ) id 1aLCd0-0002JU-CF for bug-gnu-emacs@gnu.org; Mon, 18 Jan 2016 11:26:02 -0500 Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-To: bug-gnu-emacs@gnu.org Resent-Date: Mon, 18 Jan 2016 16:26:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: cc-closed 22395 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Mail-Followup-To: 22395@debbugs.gnu.org, eliz@gnu.org, dmoncayo@gmail.com Original-Received: via spool by 22395-done@debbugs.gnu.org id=D22395.14531343298841 (code D ref 22395); Mon, 18 Jan 2016 16:26:02 +0000 Original-Received: (at 22395-done) by debbugs.gnu.org; 18 Jan 2016 16:25:29 +0000 Original-Received: from localhost ([127.0.0.1]:53046 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1aLCcT-0002IX-L5 for submit@debbugs.gnu.org; Mon, 18 Jan 2016 11:25:29 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:48101) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1aLCcS-0002IL-7h for 22395-done@debbugs.gnu.org; Mon, 18 Jan 2016 11:25:28 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aLCcJ-0002Bg-TL for 22395-done@debbugs.gnu.org; Mon, 18 Jan 2016 11:25:23 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:33355) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aLCcJ-0002Bc-Pj; Mon, 18 Jan 2016 11:25:19 -0500 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:1287 helo=HOME-C4E4A596F7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1aLCcI-0001SN-4F; Mon, 18 Jan 2016 11:25:18 -0500 In-reply-to: (message from Dani Moncayo on Sun, 17 Jan 2016 21:50:16 +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: 208.118.235.43 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:111714 Archived-At: > Date: Sun, 17 Jan 2016 21:50:16 +0100 > From: Dani Moncayo > > 1. Eval: > (setq scroll-preserve-screen-position t) > (setq scroll-margin 2) > > 2. Visit the attached file. > > On my system, I initially see lines 1 to 33. > > 3. Type 'C-v' > > I observe that 'C-v' has scrolled the buffer vertically, but only by > about a half of the window height (I now see lines 16 to 48). > Subsequent 'C-v' commands do the same: they scroll the buffer by a > half of the window. > > This seems wrong. The amount of scrolling should be "a near full > screen", as described in 'C-h k C-v'. Start the same recipe from line #3 or greater, and the "bug" goes away. You asked Emacs to do the impossible: preserve the screen position of point at the first window line and also not to allow point to enter the first 2 lines of the window. Emacs didn't know what to do with this conflict. Now it does.