From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Cc: Alan Mackenzie <acm@muc.de>
Subject: Re: [Emacs-diffs] emacs-24 d69e9f1: CC Mode: Stop Font Lock forcing fontification from BOL. Fixes debbugs#19669.
Date: Mon, 02 Feb 2015 13:54:20 -0500 [thread overview]
Message-ID: <jwv1tm8f8p1.fsf-monnier+emacsdiffs@gnu.org> (raw)
In-Reply-To: <E1YI1y9-0004eO-Re@vcs.savannah.gnu.org> (Alan Mackenzie's message of "Sun, 01 Feb 2015 21:22:13 +0000")
> + ;; Prevent `font-lock-default-fontify-region' extending the region it will
> + ;; fontify to whole lines by removing `font-lock-extend-region-whole-lines'
> + ;; (and, coincidentally, `font-lock-extend-region-multiline' (which we do
> + ;; not need)) from `font-lock-extend-region-functions'. (Emacs only). This
> + ;; fixes Emacs bug #19669.
My general understanding of font-lock's highlighting is that using
a smaller region is only ever useful for performance reason, rather than
for correctness (and this line of thinking influences the design of the
code). So I'm really curious to understand how this counter-example
works, since it might hint at further (latent) bugs elsewhere.
Can you walk me through what happens in the scenario of bug#19669?
Stefan
next prev parent reply other threads:[~2015-02-02 18:54 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20150201212213.17840.3710@vcs.savannah.gnu.org>
[not found] ` <E1YI1y9-0004eO-Re@vcs.savannah.gnu.org>
2015-02-02 18:50 ` [Emacs-diffs] emacs-24 d69e9f1: CC Mode: Stop Font Lock forcing fontification from BOL. Fixes debbugs#19669 Stefan Monnier
2015-02-02 19:27 ` Alan Mackenzie
2015-02-03 2:12 ` Stefan Monnier
2015-02-02 18:54 ` Stefan Monnier [this message]
2015-02-02 21:39 ` Alan Mackenzie
2015-02-03 2:26 ` Stefan Monnier
2015-02-07 12:27 ` Alan Mackenzie
2015-02-07 15:29 ` Stefan Monnier
2015-02-07 15:40 ` Alan Mackenzie
2015-03-16 23:53 ` Daniel Colascione
2015-03-18 12:08 ` Alan Mackenzie
2015-03-19 3:34 ` Daniel Colascione
2015-03-19 9:31 ` Alan Mackenzie
2015-03-19 13:49 ` Stefan Monnier
2015-03-19 20:37 ` Alan Mackenzie
2015-03-19 20:56 ` Stefan Monnier
2015-03-20 16:30 ` Alan Mackenzie
2015-03-20 16:34 ` Daniel Colascione
2015-03-20 17:29 ` Alan Mackenzie
2015-03-20 21:25 ` Daniel Colascione
2015-03-20 22:30 ` Alan Mackenzie
2015-03-20 18:05 ` Stefan Monnier
2015-03-20 21:12 ` Alan Mackenzie
2015-03-20 22:01 ` Stefan Monnier
2015-03-30 16:44 ` Alan Mackenzie
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