From: Dmitry Gutov <dgutov@yandex.ru>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Alan Mackenzie <acm@muc.de>, emacs-devel@gnu.org
Subject: Re: master 7362554: Widen around c-font-lock-fontify-region. This fixes bug #38049.
Date: Thu, 14 Nov 2019 17:02:36 +0200 [thread overview]
Message-ID: <cb167ee7-f4e0-8af3-2426-3c0c911a1fcc@yandex.ru> (raw)
In-Reply-To: <jwvzhgyecrm.fsf-monnier+emacs@gnu.org>
On 14.11.2019 16:55, Stefan Monnier wrote:
>> diff --git a/lisp/reposition.el b/lisp/reposition.el
>> index 22f9986efb..5d9c3180ad 100644
>> --- a/lisp/reposition.el
>> +++ b/lisp/reposition.el
>> @@ -174,8 +174,8 @@ reposition-window
>> (defun repos-count-screen-lines (start end)
>> (save-excursion
>> (save-restriction
>> - (narrow-to-region start end)
>> - (goto-char (point-min))
>> + (narrow-to-region (point-min) end)
>> + (goto-char start)
>> (vertical-motion (- (point-max) (point-min))))))
>
> This looks like a good change in any case, tho it does beg the question:
> why does it narrow?
I think it does that simply because vertical-motion takes LINES as an
argument, and not LIMIT. And it's easier to narrow the buffer than
compute the number of lines between start and end.
> Also, I think I'm beginning to understand: the issue is that
> vertical-motion uses the redisplay code, which in turn calls jit-lock
> when needed.
Exactly.
> So, your earlier patch which added a call to
> `font-lock-ensure` was "more or less right", except that it should have
> used `jit-lock-ensure` (currently called `jit-lock-fontify-now`)
But wouldn't this fail to work when jit-lock is not used? And we'll need
a guard to make sure font-lock is used as well. (*)
> and
> could have a comment explaining that vertical-motion will trigger
> jit-lock anyway so it's better to do it once beforehand on the whole
> region, not only so it can be done outside of the narrowing but also so
> it can be done more efficiently than one jit-lock-chunk-size at a time.
That's a good explanation as well, yes.
So, if you like, I can push a patch with both of these changes. If you
could only clarify what condition to use in (*).
next prev parent reply other threads:[~2019-11-14 15:02 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191109144026.20810.76129@vcs0.savannah.gnu.org>
[not found] ` <20191109144027.DDC3720927@vcs0.savannah.gnu.org>
2019-11-11 16:52 ` master 7362554: Widen around c-font-lock-fontify-region. This fixes bug #38049 Dmitry Gutov
2019-11-11 20:34 ` Alan Mackenzie
2019-11-12 13:36 ` Dmitry Gutov
2019-11-13 21:19 ` Alan Mackenzie
2019-11-13 22:33 ` Dmitry Gutov
2019-11-14 13:42 ` Stefan Monnier
2019-11-14 14:05 ` Dmitry Gutov
2019-11-14 14:29 ` Eli Zaretskii
2019-11-14 14:35 ` Dmitry Gutov
2019-11-14 14:48 ` Eli Zaretskii
2019-11-14 14:50 ` Dmitry Gutov
2019-11-14 16:08 ` Eli Zaretskii
2019-11-14 21:07 ` Dmitry Gutov
2019-11-15 9:31 ` Eli Zaretskii
2019-11-15 10:24 ` Dmitry Gutov
2019-11-15 13:00 ` Eli Zaretskii
2019-11-14 13:49 ` Eli Zaretskii
2019-11-14 14:08 ` Dmitry Gutov
2019-11-14 14:37 ` Dmitry Gutov
2019-11-14 14:55 ` Stefan Monnier
2019-11-14 15:02 ` Dmitry Gutov [this message]
2019-11-14 15:33 ` Stefan Monnier
2019-11-14 16:12 ` Eli Zaretskii
2019-11-14 18:51 ` Stefan Monnier
2019-11-14 19:19 ` Eli Zaretskii
2019-11-14 19:48 ` Dmitry Gutov
2019-11-14 19:56 ` Eli Zaretskii
2019-11-14 19:59 ` Dmitry Gutov
2019-11-15 7:34 ` Eli Zaretskii
2019-11-15 7:52 ` Dmitry Gutov
2019-11-14 21:29 ` Stefan Monnier
2019-11-14 21:46 ` Dmitry Gutov
2019-11-15 9:36 ` Eli Zaretskii
2019-11-15 10:26 ` Dmitry Gutov
2019-11-15 23:27 ` Stefan Monnier
2019-11-16 8:02 ` Eli Zaretskii
2019-11-17 0:50 ` Stefan Monnier
2019-11-17 3:33 ` Eli Zaretskii
2019-11-17 7:36 ` Dmitry Gutov
2019-11-17 15:44 ` Eli Zaretskii
2019-11-17 17:59 ` Dmitry Gutov
2019-11-17 18:26 ` Eli Zaretskii
2019-11-17 18:35 ` Dmitry Gutov
2019-11-14 19:58 ` Dmitry Gutov
2019-11-14 21:24 ` Several Major Modes. [Was: master 7362554: Widen around c-font-lock-fontify-region. This fixes bug #38049.] Alan Mackenzie
2019-11-14 22:11 ` Dmitry Gutov
2019-11-15 20:10 ` Several Major Modes Alan Mackenzie
2019-11-15 21:45 ` Dmitry Gutov
2019-11-16 13:10 ` Alan Mackenzie
2019-11-17 12:48 ` Dmitry Gutov
2019-11-17 16:03 ` Alan Mackenzie
2019-11-17 21:56 ` Dmitry Gutov
2019-11-14 13:35 ` master 7362554: Widen around c-font-lock-fontify-region. This fixes bug #38049 Eli Zaretskii
2019-11-15 22:43 ` Dmitry Gutov
2019-11-14 12:02 ` Eli Zaretskii
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