Re: Scrolling commands and skipping redisplay, was: Re: emacs rendering comparisson between emacs23 and emacs26.3

[Stefan Monnier]

>> - Implementation-wise, not all commands simulate redisplay during their 
>>   operation.
> I think you will find that many more do than you seem to assume.  Even
> just redisplaying a window does this in many cases (to find the proper
> place for window-start position).  C-n and C-p do as well.

char-based, word-based, and sexp-based motion doesn't.  But line and
motion that depends on "visual size" indeed typically does.

> And when scroll-conservatively is in effect, almost every command that
> moves point does.

Really?  I thought `scroll-conservatively` only affects the redisplay
code and not the execution of "normal" commands (i.e. commands which
don't themselves rely on simulating redisplay).


        Stefan