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

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: gundaetiapo@gmail.com,  deng@randomsample.de,  15045@debbugs.gnu.org,  
> eric@siege-engine.com
> Date: Thu, 08 Aug 2013 18:50:42 -0400
> 
> > I think the right solution is to not call input-pending-p etc. during
> > lexer run.
> 
> Not calling accept-process-output might be tricky.
> And not calling input-pending-p can also require very significant
> code changes (I think support for concurrency would help a lot here).

Then perhaps the code which calls them should make sure to move point
to where the user expects it, before it does call those APIs.