From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Mon, 01 Aug 2022 15:08:16 +0300 Message-ID: <83sfmg2mkv.fsf@gnu.org> References: <837d46mjen.fsf@gnu.org> <8a3eaeef01be5bfaa5ef@heytings.org> <05388e8d8812bfa3695d@heytings.org> <83v8rf5894.fsf@gnu.org> <65cb7c73fd4a999cca00@heytings.org> <8c7321f2f3400a5db9be@heytings.org> <8c7321f2f388e5343475@heytings.org> <6ea376f6-d503-06d8-6d83-50c52b695394@yandex.ru> <8c7321f2f3ac52bfee4b@heytings.org> <2f7eeea3-6ba9-d2c2-1fb9-dd40d2de2002@yandex.ru> <8c7321f2f368e8dd096d@heytings.org> <56a688f6-6c93-8b67-895c-2c41f563fc93@yandex.ru> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1478"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, gregory@heytings.org, monnier@iro.umontreal.ca To: Dmitry Gutov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 01 14:10:24 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 1oIUFb-0000Dn-Nh for geb-bug-gnu-emacs@m.gmane-mx.org; 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Original-Received: from [87.69.77.57] (port=2281 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oIUDj-00019M-3o; Mon, 01 Aug 2022 08:08:32 -0400 In-Reply-To: <56a688f6-6c93-8b67-895c-2c41f563fc93@yandex.ru> (message from Dmitry Gutov on Mon, 1 Aug 2022 04:23:21 +0300) 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:238416 Archived-At: > Date: Mon, 1 Aug 2022 04:23:21 +0300 > Cc: 56682@debbugs.gnu.org, Eli Zaretskii , > Stefan Monnier > From: Dmitry Gutov > > IIUC this state of affairs is caused by your chosen approach to speeding > up font-lock (hard narrowing while it is called), which makes the > initial call to syntax-ppss happen inside that narrowing as well. > > The alternative being that font-lock would call syntax-ppss right away > with no restriction, but then only apply highlighting to limited parts > of the buffer. AFAIU, this seems to assume that highlighting is much faster than syntax-ppss. Is that a given? If not, I don't think I understand how this could help. > > It is way better to wait > > a few seconds more while the file is being opened than to wait before > > two basic motion commands when the file is already opened. > > I agree, yes. I don't. > > It doesn't only solve the syntax-ppss problem, it also makes > > flyspell-mode usable in such files, for example. > > Does flyspell-mode always scan the full buffer? flyspell-mode doesn't scan anything but the text you type, as you type it. Anything else must be explicitly invoked by the user.