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: Wed, 03 Aug 2022 05:33:22 +0300 Message-ID: <83pmhi5a4t.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> <83sfmg2mkv.fsf@gnu.org> <17c0d4df-78f5-76f4-784d-5c9d52eb7fa0@yandex.ru> <83bkt27rij.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9674"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, gregory@heytings.org, dgutov@yandex.ru To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 03 04:34:09 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 1oJ4D3-0002Ld-KQ for geb-bug-gnu-emacs@m.gmane-mx.org; 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Original-Received: from [87.69.77.57] (port=4832 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 1oJ4CP-0004fq-92; Tue, 02 Aug 2022 22:33:29 -0400 In-Reply-To: (message from Stefan Monnier on Tue, 02 Aug 2022 17:46:49 -0400) 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:238608 Archived-At: > From: Stefan Monnier > Cc: Dmitry Gutov , 56682@debbugs.gnu.org, > gregory@heytings.org > Date: Tue, 02 Aug 2022 17:46:49 -0400 > > >> So ideally font-lock is either called with undo-able narrowing, or is > >> simply passed a range of positions, and shouldn't fontify too far from them. > > Many major-modes do widen the buffer, though. > > Actually, IIUC this should be considered a bug (it breaks the use of > that major in mmm-mode and friends). > > [ And `grep` suggests that less than half of progmodes/*.el use `widen`. ] That fits my definition of "many". And we also need to consider specifically those modes which are likely to happen in files with long lines.