From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
Date: Sat, 04 Sep 2021 21:10:07 +0300
Message-ID: <83k0jwus8w.fsf@gnu.org>
References: <jwvy28gyq7r.fsf-monnier+emacs@gnu.org> <YTECb74grFWmxe/f@ACM>
 <jwvpmtqg701.fsf-monnier+emacs@gnu.org> <YTElA9YrwCy6po+l@ACM>
 <83a6kuyysv.fsf@gnu.org> <YTJS5/+RYKG9H6FV@ACM> <YTKKypeH8Qdyx7yf@ACM>
 <837dfwyird.fsf@gnu.org> <YTOHorezJ5Lz+S/o@ACM>
 <jwvk0jwie0b.fsf-monnier+emacs@gnu.org> <YTORqWPX9lEyOBZ9@ACM>
 <jwvv93ggwrv.fsf-monnier+emacs@gnu.org> <83tuj0ux6y.fsf@gnu.org>
 <jwv1r64gv14.fsf-monnier+emacs@gnu.org> <83pmtouul2.fsf@gnu.org>
 <jwvczpofd7s.fsf-monnier+emacs@gnu.org>
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="20988"; mail-complaints-to="usenet@ciao.gmane.io"
Cc: acm@muc.de, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 04 20:11:00 2021
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1mMa83-0005H7-Kl
	for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 20:10:59 +0200
Original-Received: from localhost ([::1]:33882 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1mMa82-0007Ok-Du
	for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 14:10:58 -0400
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36702)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>) id 1mMa7N-0006jE-Gv
 for emacs-devel@gnu.org; Sat, 04 Sep 2021 14:10:17 -0400
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:39910)
 by eggs.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>)
 id 1mMa7M-0002bd-Dg; Sat, 04 Sep 2021 14:10:16 -0400
Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4008
 helo=home-c4e4a596f7)
 by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>)
 id 1mMa7D-000545-Pc; Sat, 04 Sep 2021 14:10:16 -0400
In-Reply-To: <jwvczpofd7s.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Sat, 04 Sep 2021 13:47:09 -0400)
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/emacs-devel>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org
Original-Sender: "Emacs-devel"
 <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.devel:273942
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/273942>

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: acm@muc.de,  emacs-devel@gnu.org
> Date: Sat, 04 Sep 2021 13:47:09 -0400
> 
> IIRC it's a result of the redisplay skipping invisible text and hence not
> calling `fontification-functions` on it.

My reading of the xdisp.c code is that it first invokes
fontification-functions, and only after that checks for invisible
text.  See handle_stop and the way it iterates over the handlers in
the it_props array.

Do you have some Lisp to show that invisible text isn't fontified by
jit-lock?