> From: Richard Stallman <[EMAIL PROTECTED]>
> CC: [EMAIL PROTECTED], emacs-devel@gnu.org
> Date: Tue, 26 Apr 2005 18:56:25 -0400
>
> One way to do that is to set jit-lock-defer-time.
>
> Are you suggesting this as a change in the defaults?
> I'm not interested in this as a workaround for me alone;
> I want to make it faster for everyone.
It could be the default (a value such as 0.2 would be good, I think),
although I'm not sure how users will react: the current behavior in
21.x series of Emacs is effectively as if jit-lock-defer-time were
nil, and I don't think I've seen a significant number of complaints
about scrolling.
Personally, I'd reset that option to nil if its default were changed,
because I rarely page through a buffer with C-n, and because on modern
machines the slowdown is barely visible, but the flash of unfontified
text is annoyingly obvious. But that's just me.
> I found a way to change line-move-1 not to use vertical-motion
> in simple cases. I think it should work, but I don't understand
> the reason why the code uses vertical-motion.
It's ancient history, from before the display engine was rewritten for
Emacs 21. Here's the relevant entry from the logs:
1995-03-09 Richard Stallman <[EMAIL PROTECTED]>
* simple.el (line-move-ignore-invisible): New variable.
(line-move): If that var is set, use vertical-motion.
Skip any extra invis chars beyond where vertical-motion stops.
So it seems like you ought to know the reason ;-)
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