From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: (pos-visible-in-window-p t nil t) returns wrong position/is suboptimally documented. Date: Wed, 30 Sep 2015 12:32:39 +0300 Message-ID: <83lhbob6bs.fsf@gnu.org> References: <20150927104041.GA2401@acm.fritz.box> <8337y0f7es.fsf@gnu.org> <83twqcbcem.fsf@gnu.org> <20150930085611.GA6672@acm.fritz.box> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1443677583 13531 80.91.229.3 (1 Oct 2015 05:33:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 1 Oct 2015 05:33:03 +0000 (UTC) Cc: emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Oct 01 07:32:56 2015 Return-path: Envelope-to: ged-emacs-devel@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 1ZhWUB-0007PS-5Q for ged-emacs-devel@m.gmane.org; Thu, 01 Oct 2015 07:32:55 +0200 Original-Received: from localhost ([::1]:38342 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZhWU9-0004Xv-Po for ged-emacs-devel@m.gmane.org; Thu, 01 Oct 2015 01:32:53 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:42097) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZhDkT-0006H7-1F for emacs-devel@gnu.org; Wed, 30 Sep 2015 05:32:29 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZhDkP-00009d-P6 for emacs-devel@gnu.org; Wed, 30 Sep 2015 05:32:28 -0400 Original-Received: from mtaout21.012.net.il ([80.179.55.169]:37385) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZhDkP-00009X-Gv for emacs-devel@gnu.org; Wed, 30 Sep 2015 05:32:25 -0400 Original-Received: from conversion-daemon.a-mtaout21.012.net.il by a-mtaout21.012.net.il (HyperSendmail v2007.08) id <0NVH00300H5R7Q00@a-mtaout21.012.net.il> for emacs-devel@gnu.org; Wed, 30 Sep 2015 12:32:24 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([84.94.185.246]) by a-mtaout21.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NVH00307H5Z3A90@a-mtaout21.012.net.il>; Wed, 30 Sep 2015 12:32:24 +0300 (IDT) In-reply-to: <20150930085611.GA6672@acm.fritz.box> X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: Solaris 10 X-Received-From: 80.179.55.169 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:190510 Archived-At: > Date: Wed, 30 Sep 2015 08:56:11 +0000 > Cc: emacs-devel@gnu.org > From: Alan Mackenzie > > "If POSITION is `t', that means to check the first visible position > of the last visible screen line in WINDOW." > > doesn't seem quite right. If the text in the window is scrolled such > that EOB is in the middle of the window, POSITION t gives the > coordinates of the last line containing text, not the last visible > screen line. You mean, it isn't clear that "screen line" means line with text? I could add "with text" if that's the issue (I thought it was obvious). > How about something like: > > "If POSITION is `t', that means to check the first visible position > of the last visible screen line in WINDOW which is at or above the > end of the window's buffer." Too complex, IMO. It took me 4 readings to understand what you mean, and that's _after_ I've read the description of the situation you were taking about. > However 2: I think there's a bug in the functionality, too. If there is > o - a text buffer > o - with no terminating LF on its last line, and > o - that last line is above the window's last line > then (pos-visible-in-window t nil t) returns the coordinates of the last > lines's EOL. This is the case in both a Linux virtual terminal and an X > windows session. It's not a bug. If you think it's important to mention this marginal use case, I can add that, too.