From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Juri Linkov Newsgroups: gmane.emacs.bugs Subject: bug#33798: 27.0.50; font-lock-ensure fontifies the whole buffer Date: Wed, 19 Dec 2018 00:15:12 +0200 Organization: LINKOV.NET Message-ID: <87woo632j3.fsf@mail.linkov.net> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1545172750 20145 195.159.176.226 (18 Dec 2018 22:39:10 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 18 Dec 2018 22:39:10 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu) Cc: stefan monnier To: 33798@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Dec 18 23:39:06 2018 Return-path: 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 ) id 1gZO13-00056w-CE for geb-bug-gnu-emacs@m.gmane.org; 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Tue, 18 Dec 2018 14:39:38 -0800 (PST) X-DH-BACKEND: pdx1-sub0-mail-a38 X-VR-OUT-STATUS: OK X-VR-OUT-SCORE: 0 X-VR-OUT-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedtkedrudeikedguddufecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucggtfgfnhhsuhgsshgtrhhisggvpdfftffgtefojffquffvnecuuegrihhlohhuthemuceftddtnecunecujfgurhephffvufhofffkfgggtgesthdtredttdertdenucfhrhhomheplfhurhhiucfnihhnkhhovhcuoehjuhhriheslhhinhhkohhvrdhnvghtqeenucfkphepledurdduvdelrdeliedrudejjeenucfrrghrrghmpehmohguvgepshhmthhppdhhvghlohepmhgrihhlrdhjuhhrthgrrdhorhhgpdhinhgvthepledurdduvdelrdeliedrudejjedprhgvthhurhhnqdhprghthheplfhurhhiucfnihhnkhhovhcuoehjuhhriheslhhinhhkohhvrdhnvghtqedpmhgrihhlfhhrohhmpehjuhhriheslhhinhhkohhvrdhnvghtpdhnrhgtphhtthhopegsuhhgqdhgnhhuqdgvmhgrtghssehgnhhurdhorhhgnecuvehluhhsthgvrhfuihiivgeptd X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x 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" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:153581 Archived-At: X-Debbugs-CC: Stefan Monnier The simplest test case to reproduce this is to eval in emacs -Q: (with-temp-buffer (insert "#include \n\nmain()\n{\n printf(\"Hello, world\");\n}") (c-mode) (font-lock-ensure 21 (point-max)) (get-text-property (point-min) 'face)) that returns => font-lock-preprocessor-face This means that `font-lock-ensure' fontifies not only the given region, but also the whole buffer. OTOH, (with-temp-buffer (insert "#include \n\nmain()\n{\n printf(\"Hello, world\");\n}") (c-mode) (font-lock-fontify-region 21 (point-max)) (get-text-property (point-min) 'face)) returns `nil' that means that it fontifies only within the specified boundary. This difference is essential for bug#33567: Syntactic fontification of diff hunks where fontifying the whole buffer might slow down fontification of diff hunks that are small parts of the whole buffer.