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#29002: it.first_visible_x is erroneously 0 while horizontal scrolling. Date: Sun, 29 Oct 2017 20:56:05 +0200 Message-ID: <831sllvl4q.fsf@gnu.org> References: <833761vmdf.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1509303439 7669 195.159.176.226 (29 Oct 2017 18:57:19 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 29 Oct 2017 18:57:19 +0000 (UTC) Cc: 29002@debbugs.gnu.org To: esq@lawlist.com Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Oct 29 19:57:14 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e8sli-00014p-Il for geb-bug-gnu-emacs@m.gmane.org; Sun, 29 Oct 2017 19:57:10 +0100 Original-Received: from localhost ([::1]:37391 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e8slp-0006Ze-IR for geb-bug-gnu-emacs@m.gmane.org; Sun, 29 Oct 2017 14:57:17 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:42173) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e8slg-0006YI-1k for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2017 14:57:08 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e8sla-0003RZ-QH for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2017 14:57:07 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:60445) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1e8sla-0003RI-Lo for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2017 14:57:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1e8sla-0003Zp-Er for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2017 14:57:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 29 Oct 2017 18:57:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 29002 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 29002-submit@debbugs.gnu.org id=B29002.150930337813681 (code B ref 29002); Sun, 29 Oct 2017 18:57:02 +0000 Original-Received: (at 29002) by debbugs.gnu.org; 29 Oct 2017 18:56:18 +0000 Original-Received: from localhost ([127.0.0.1]:40889 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e8sks-0003Yb-6k for submit@debbugs.gnu.org; Sun, 29 Oct 2017 14:56:18 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:51064) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e8skq-0003YN-P6 for 29002@debbugs.gnu.org; Sun, 29 Oct 2017 14:56:16 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e8skg-0002oQ-RP for 29002@debbugs.gnu.org; Sun, 29 Oct 2017 14:56:11 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:38181) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e8skg-0002o9-Od; Sun, 29 Oct 2017 14:56:06 -0400 Original-Received: from [176.228.60.248] (port=2707 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1e8skg-00078Z-9H; Sun, 29 Oct 2017 14:56:06 -0400 In-reply-to: <833761vmdf.fsf@gnu.org> (message from Eli Zaretskii on Sun, 29 Oct 2017 20:29:16 +0200) 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" Xref: news.gmane.org gmane.emacs.bugs:139163 Archived-At: > Date: Sun, 29 Oct 2017 20:29:16 +0200 > From: Eli Zaretskii > Cc: 29002@debbugs.gnu.org > > > * A total of 5 screen lines. > > > > * Line 1 is the current line. > > > > * All 5 lines visually appear to be horizontally scrolled. > > > > * Using the revised function bug-hscroll (below), we iterate over each screen line and generate the values for it.first_visible_x and it.vpos. > > > > * it.first_visible_x returns as being 0 for each of the 5 screen lines. > > This cannot be true: if every line in the window is hscrolled, > first_visible_x must be non-zero, right after the call to > start_display. Forgot to say: I cannot reproduce your results. In my case, first_visible_x is non-zero all the way through the loop, as expected. Are you sure this isn't a side effect of one of your other changes?