Re: Unfreezing the display during auto-repeated scrolling. Simpler approach.

[David Kastrup <dak@gnu.org>]

Tassilo Horn <tsdh@gnu.org> writes:

> Alan Mackenzie <acm@muc.de> writes:
>
>> It's CC Mode's fontification, rather than the display engine, which is
>> slow here.  But in a large window, even Emacs Lisp Mode can only just
>> keep up: On my 2.6 GHz Athlon II, with a 66 line window, and the
>> keyboard auto-repeating every 0.024s, fontifying and displaying a
>> screen took ~0.018s.  There's not a lot of spare time for fancier
>> fontification.
>
> Indeed.
>
>>> But still I think the variable's name is a bit misleading.  I
>>> expected to see the text that scrolls by black on white, i.e., using
>>> the default face similar to having `jit-lock-defer-time' set to some
>>> non-nil value.  But instead the text that scrolls by and is visible
>>> is fontified using the normal font-lock faces.
>>
>> :-).  I had quite some trouble coming up with a name for the option.
>> Something like
>> `assume-default-face-for-nondisplayed-screens-in-scrolling' would be
>> more accurate, but a bit of a mouthful.  If you've any suggestions for
>> improvement, post them!
>
> Maybe something like `font-lock-omit-nondisplayed-screens-on-scoll'?

font-lock-preempt-when-scrolling

-- 
David Kastrup