Re: Scrolling commands and skipping redisplay

[Alan Mackenzie]

Hello, Eli.

On Sat, Apr 11, 2020 at 20:15:55 +0300, Eli Zaretskii wrote:
> > Date: Sat, 11 Apr 2020 17:04:04 +0000
> > Cc: address@hidden, address@hidden, address@hidden, address@hidden,
> >   address@hidden
> > From: Alan Mackenzie <address@hidden>

> > It sounds like your time for scrolling a screen, even without
> > fontification, is close to your auto-repeat time.

> _Only_ without fontification.  With fontifications, at least in CC
> Mode, Emacs gets stuck after several screenfuls in -O0 and -Og builds,
> which means the time to scroll is longer than the auto-repeat
> interval.

This would presumably happen in emacs-lisp-mode, too, if you ever did
auto-repeated C-v's.

> >     As an alternative to setting `fast-but-imprecise-scrolling' you
> >     might prefer to enable jit-lock deferred fontification (See Font
> >     Lock).  To do this, customize `jit-lock-defer-time' to a small
> >     positive number such as 0.1.  This gives you less jerky scrolling,
> >     but the buffer contents on any scroll operation into a fresh portion
> >     of the buffer will at first be unfontified,

> No objections.

OK, I've tidied it up a bit, and pushed it to the emacs-27 branch.

It's looking like the gnu.org mailing server is down.

-- 
Alan Mackenzie (Nuremberg, Germany).