bug#21730: 25.0.50; Random errors in redisplay--pre-redisplay-functions

[Eli Zaretskii]

> From: Michael Welsh Duggan <mwd@md5i.com>
> Date: Sat, 31 Oct 2015 09:07:05 -0400
> 
> > I've changed the (bobp) to (= point 1).  I'll run it for a couple of
> > weeks and report back.
> 
> This change seems to have done the trick.  I have not encountered the
> error in several days.

Thanks for testing.  I pushed the change, and I'm arking this bug as
done.