From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#16526: 24.3.50; scroll-conservatively & c-mode regression Date: Sun, 29 Jun 2014 18:14:45 -0400 Message-ID: References: <20140628130059.GA4144@acm.acm> <53AECA88.7010401@gmx.at> <20140628145509.GB4144@acm.acm> <53AFD1FA.5010201@gmx.at> <20140629091757.GA2948@acm.acm> <53AFE536.7010407@gmx.at> <20140629124829.GC2948@acm.acm> <53B02042.1050107@gmx.at> <20140629144151.GD2948@acm.acm> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1404080139 5037 80.91.229.3 (29 Jun 2014 22:15:39 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 29 Jun 2014 22:15:39 +0000 (UTC) Cc: 16526-done@debbugs.gnu.org To: Alan Mackenzie Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Jun 30 00:15:32 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X1NNj-0007Ak-SO for geb-bug-gnu-emacs@m.gmane.org; Mon, 30 Jun 2014 00:15:31 +0200 Original-Received: from localhost ([::1]:59286 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X1NNj-0004f6-22 for geb-bug-gnu-emacs@m.gmane.org; Sun, 29 Jun 2014 18:15:31 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:44152) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X1NNW-0004ew-MB for bug-gnu-emacs@gnu.org; Sun, 29 Jun 2014 18:15:26 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X1NNP-0006AX-5n for bug-gnu-emacs@gnu.org; Sun, 29 Jun 2014 18:15:18 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:45903) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X1NNH-0005xr-9R; Sun, 29 Jun 2014 18:15:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1X1NNG-0003wf-Dw; Sun, 29 Jun 2014 18:15:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org, bug-cc-mode@gnu.org Resent-Date: Sun, 29 Jun 2014 22:15:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 16526 X-GNU-PR-Package: emacs,cc-mode X-GNU-PR-Keywords: Original-Received: via spool by 16526-done@debbugs.gnu.org id=D16526.140408009415137 (code D ref 16526); Sun, 29 Jun 2014 22:15:02 +0000 Original-Received: (at 16526-done) by debbugs.gnu.org; 29 Jun 2014 22:14:54 +0000 Original-Received: from localhost ([127.0.0.1]:37053 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1X1NN8-0003w4-AY for submit@debbugs.gnu.org; Sun, 29 Jun 2014 18:14:54 -0400 Original-Received: from ironport2-out.teksavvy.com ([206.248.154.181]:8540) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1X1NN5-0003vn-Pw for 16526-done@debbugs.gnu.org; Sun, 29 Jun 2014 18:14:52 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ArYGAIDvNVNLd+D9/2dsb2JhbABZgwaDSr0vgw6BFxd0giUBAQEBAgFWIwULCw4mEhQYDSSIBAjSGReOegeEOASpGYFqg0wh X-IPAS-Result: ArYGAIDvNVNLd+D9/2dsb2JhbABZgwaDSr0vgw6BFxd0giUBAQEBAgFWIwULCw4mEhQYDSSIBAjSGReOegeEOASpGYFqg0wh X-IronPort-AV: E=Sophos;i="4.97,753,1389762000"; d="scan'208";a="69917338" Original-Received: from 75-119-224-253.dsl.teksavvy.com (HELO ceviche.home) ([75.119.224.253]) by ironport2-out.teksavvy.com with ESMTP/TLS/ADH-AES256-SHA; 29 Jun 2014 18:14:45 -0400 Original-Received: by ceviche.home (Postfix, from userid 20848) id 6E17E66138; Sun, 29 Jun 2014 18:14:45 -0400 (EDT) In-Reply-To: <20140629144151.GD2948@acm.acm> (Alan Mackenzie's message of "Sun, 29 Jun 2014 14:41:51 +0000") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:90980 Archived-At: > scan-lists, a primitive, must be utterly robust. syntax-ppss is too > fragile to be used here without a lot of hardening. FWIW, CC-mode is one of the last remaining major modes (at least the only one I know of that's bundled with Emacs) that doesn't play nice with syntax-ppss. Incidentally, AFAIK it's also the only code which uses font-lock-extend-after-change-region-function (and yes, I think the two are (indirectly) related). > If one were to harden syntax-ppss against all these things, one would > probably end up calculating the cache from scratch every time, in effect. Exactly. IOW a cache can only be robust if the major mode plays by the rules, which cc-mode doesn't do. Stefan