bug#22466: 25.0.50; disable-theme apparently forces a redisplay and causes a screen flash

[Drew Adams]

> > > Anyway, how come you get to doing this so often it hurts your eyes?
> > > Aren't people setting their beloved theme once when the session
> > > starts, and then never change it?
> >
> > I can't speak for the OP, but no, users can well want to cycle
> > through a set of themes before choosing one.
> 
> Yes, once.  Until they choose that one.

But they might do this over and over, in different contexts.
Anyway, I've made the point.  Up to you whether it matters.