GNU bug report logs - #12937
24.2; Fontification performed in 'jit-lock-defer-time' in any case (don't wait while Emacs become really idle).

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 12937 <at> debbugs.gnu.org, Oleksandr Gavenko <gavenkoa <at> gmail.com>
Subject: bug#12937: 24.2; Fontification performed in 'jit-lock-defer-time' in any case (don't wait while Emacs become really idle).
Date: Wed, 30 Oct 2019 23:45:09 +0100

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> I don't see that.  I'm not sure how you tried, it but I did
>
>   src/emacs -Q --eval '(setq jit-lock-defer-time 0.01)' src/xdisp.c
>
> and scrolling with page-down indeed is jerky and I see that the buffer
> is getting fontified (at least occasionally).  But if I try again with
>
>   src/emacs -Q --eval '(setq jit-lock-defer-time 0.1)' src/xdisp.c
>
> then the scrolling is fast&smooth and it only gets fontified when
> I stop scrolling.

I tried this in Emacs 27 (on a pretty fast laptop), and I got no
jerkiness when holding <down> (and things are fontified as I scroll).  I
also tried 0.001.

So is this still a problem?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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