bug#15045: Point jumps inappropriately around time of Semantic lexing

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: deng@randomsample.de,  gundaetiapo@gmail.com,  15045@debbugs.gnu.org,  
> eric@siege-engine.com
> Date: Thu, 08 Aug 2013 18:51:17 -0400
> 
> >> Right, that would do it.
> >> What happens if you remove the calls to sit-for from time.el?
> > You cannot ensure redisplay without that.
> 
> I don't know what scenario you have in mind.

Any one.  Emacs enters redisplay for any number of reasons, but you
can never be sure it will do so at any specific point unless you force
redisplay at that point.  As you well know, in general, while Lisp
code runs, Emacs does not redisplay.