From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Tue, 02 Aug 2022 18:26:51 -0400 Message-ID: References: <83v8rf5894.fsf@gnu.org> <65cb7c73fd4a999cca00@heytings.org> <8c7321f2f3400a5db9be@heytings.org> <8c7321f2f388e5343475@heytings.org> <6ea376f6-d503-06d8-6d83-50c52b695394@yandex.ru> <8c7321f2f3ac52bfee4b@heytings.org> <8c7321f2f3ec1ef81af9@heytings.org> <02e83b0e-1b5c-fe75-6e59-1f8ddff82d37@yandex.ru> <96f28fd8-6744-1925-0631-0095099362dd@yandex.ru> <74ddc877f1e81f399eea@heytings.org> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="4898"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Dmitry Gutov To: Gregory Heytings Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 03 00:28:35 2022 Return-path: Envelope-to: geb-bug-gnu-emacs@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 ) id 1oJ0NO-00015p-Cg for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 03 Aug 2022 00:28:34 +0200 Original-Received: from localhost ([::1]:53710 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oJ0NM-0004lQ-2w for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 02 Aug 2022 18:28:32 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56700) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oJ0Mt-0004i9-1e for bug-gnu-emacs@gnu.org; Tue, 02 Aug 2022 18:28:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:55630) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oJ0Ms-0003JF-Nm for bug-gnu-emacs@gnu.org; Tue, 02 Aug 2022 18:28:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oJ0Ms-0004Mm-Dt for bug-gnu-emacs@gnu.org; Tue, 02 Aug 2022 18:28:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 02 Aug 2022 22:28:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 56682 X-GNU-PR-Package: emacs Original-Received: via spool by 56682-submit@debbugs.gnu.org id=B56682.165947922816707 (code B ref 56682); Tue, 02 Aug 2022 22:28:02 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 2 Aug 2022 22:27:08 +0000 Original-Received: from localhost ([127.0.0.1]:45379 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJ0Lz-0004LP-MB for submit@debbugs.gnu.org; Tue, 02 Aug 2022 18:27:07 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:21499) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJ0Lu-0004Kn-SW for 56682@debbugs.gnu.org; Tue, 02 Aug 2022 18:27:06 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id CEBA14421FB; Tue, 2 Aug 2022 18:26:56 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 8B70C4421CC; Tue, 2 Aug 2022 18:26:55 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1659479215; bh=7H6D2c9dowGNiho42ZKBLzh+vceCz7kKaDXSToc+PcM=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=Y4FF3plDt8F244cIV1fdDuEWtpJEbAX/auBNkPuk6qup1V4tkg+nT2aD7r/zcbie1 BqXaFvCWKP76hGx4kz3Pp8OUNYPv6Zz89co4momq3lLqamP03ACGKFHEAcsaZWEHN4 1ND/0IhZbTOH8difZo4N4GRGv9Ccs7TwWV006YYjN53mXc4CP5LWf/kFwdMCf2/ukk vYuAEm3cfljGwNahcKwHggg9SKQsdmoXX+MiLMKRl73x5HGZOicKGYsu3mKPZsmKVJ IryzujDbhQty7EbdB5eYiIPKVcvrRtopqGaRx0IpukZZu4Ejc7kIU7qvDBtsQuwGAb vK4iD7j6/7bCw== Original-Received: from milanesa (unknown [46.44.221.102]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 9636C1202C1; Tue, 2 Aug 2022 18:26:54 -0400 (EDT) In-Reply-To: <74ddc877f1e81f399eea@heytings.org> (Gregory Heytings's message of "Tue, 02 Aug 2022 21:26:31 +0000") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:238596 Archived-At: > You're a mathematician, aren't you? I'm not speaking of mathematical > (i.e. absolute) necessity here, but of a practical necessity. I agree with the practical necessity to narrow. I strongly disagree with the necessity to make re-widening technically impossible, I find it fundamentally incompatible with Emacs's philosophy and can't see any practical justification here. Just narrow and make sure jit-lock.el and font-lock.el don't accidentally widen it. Any other accidental widening should be considered as a bug anyway (and we could even easily cook up some ad-hoc advice to try and detect those cases for people like me who lke to run their Emacs with lots of extra runtime debugging checks). Stefan