From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!.POSTED!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#16475: enhancement request: remove vertical scroll bar
	automatically when not needed
Date: Thu, 26 Oct 2017 19:30:17 +0300
Message-ID: <83zi8d7tye.fsf@gnu.org>
References: <m2k1zic1az.wl%esq@lawlist.com>
Reply-To: Eli Zaretskii <eliz@gnu.org>
NNTP-Posting-Host: blaine.gmane.org
X-Trace: blaine.gmane.org 1509035489 9705 195.159.176.226 (26 Oct 2017 16:31:29 GMT)
X-Complaints-To: usenet@blaine.gmane.org
NNTP-Posting-Date: Thu, 26 Oct 2017 16:31:29 +0000 (UTC)
Cc: 16475@debbugs.gnu.org
To: Keith David Bershatsky <esq@lawlist.com>
Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Oct 26 18:31:25 2017
Return-path: <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org>
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 <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org>)
	id 1e7l3t-0000tY-3p
	for geb-bug-gnu-emacs@m.gmane.org; Thu, 26 Oct 2017 18:31:17 +0200
Original-Received: from localhost ([::1]:53807 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org>)
	id 1e7l3x-00028e-CJ
	for geb-bug-gnu-emacs@m.gmane.org; Thu, 26 Oct 2017 12:31:21 -0400
Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55989)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1e7l3n-00028W-Tv
	for bug-gnu-emacs@gnu.org; Thu, 26 Oct 2017 12:31:17 -0400
Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1e7l3e-0003A7-AM
	for bug-gnu-emacs@gnu.org; Thu, 26 Oct 2017 12:31:11 -0400
Original-Received: from debbugs.gnu.org ([208.118.235.43]:54882)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <Debian-debbugs@debbugs.gnu.org>)
	id 1e7l3e-0003A3-7E
	for bug-gnu-emacs@gnu.org; Thu, 26 Oct 2017 12:31:02 -0400
Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1e7l3d-0006NP-W4
	for bug-gnu-emacs@gnu.org; Thu, 26 Oct 2017 12:31:02 -0400
X-Loop: help-debbugs@gnu.org
Resent-From: Eli Zaretskii <eliz@gnu.org>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@gnu.org
Resent-Date: Thu, 26 Oct 2017 16:31:01 +0000
Resent-Message-ID: <handler.16475.B16475.150903544323238@debbugs.gnu.org>
Resent-Sender: help-debbugs@gnu.org
X-GNU-PR-Message: followup 16475
X-GNU-PR-Package: emacs
X-GNU-PR-Keywords: 
Original-Received: via spool by 16475-submit@debbugs.gnu.org id=B16475.150903544323238
	(code B ref 16475); Thu, 26 Oct 2017 16:31:01 +0000
Original-Received: (at 16475) by debbugs.gnu.org; 26 Oct 2017 16:30:43 +0000
Original-Received: from localhost ([127.0.0.1]:35330 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <debbugs-submit-bounces@debbugs.gnu.org>)
	id 1e7l3L-00062L-2U
	for submit@debbugs.gnu.org; Thu, 26 Oct 2017 12:30:43 -0400
Original-Received: from eggs.gnu.org ([208.118.235.92]:36649)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <eliz@gnu.org>) id 1e7l3H-0005sj-2x
	for 16475@debbugs.gnu.org; Thu, 26 Oct 2017 12:30:39 -0400
Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <eliz@gnu.org>) id 1e7l36-0002pq-6b
	for 16475@debbugs.gnu.org; Thu, 26 Oct 2017 12:30:33 -0400
Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:59254)
	by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@gnu.org>)
	id 1e7l36-0002pg-0s; Thu, 26 Oct 2017 12:30:28 -0400
Original-Received: from [176.228.60.248] (port=2225 helo=home-c4e4a596f7)
	by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256)
	(Exim 4.82) (envelope-from <eliz@gnu.org>)
	id 1e7l35-0006SA-BX; Thu, 26 Oct 2017 12:30:27 -0400
In-reply-to: <m2k1zic1az.wl%esq@lawlist.com> (message from Keith David
	Bershatsky on Wed, 25 Oct 2017 15:25:40 -0700)
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" <bug-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-gnu-emacs>,
	<mailto:bug-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/bug-gnu-emacs/>
List-Post: <mailto:bug-gnu-emacs@gnu.org>
List-Help: <mailto:bug-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-gnu-emacs>,
	<mailto:bug-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org
Original-Sender: "bug-gnu-emacs"
	<bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org>
Xref: news.gmane.org gmane.emacs.bugs:139018
Archived-At: <http://permalink.gmane.org/gmane.emacs.bugs/139018>

> Date:  Wed, 25 Oct 2017 15:25:40 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  16475@debbugs.gnu.org
> 
> Scroll bars are not immediately removed, however, when `window_contents_visible_p` is true and this-command is a keyboard stroke.

Most probably because some redisplay optimization bypasses your code.

> Any ideas on how to immediately remove scroll bars from the target window when `window_contents_visible_p` is true?  [I have chosen the end of `redisplay_window` to perform the test because window start/end *should be* accurate at that location of the code.]

Like I said: I think the way this works will cause annoying visual
effects, so I propose to call set-window-scroll-bars from keyboard.c,
before we enter redisplay.