bug#9432: 24.0.50; doc string of `next-error-highlight'

[Juri Linkov]

> (And FWIW I still think we should also have a value `until-move' that does the
> same thing - stay until some other locus replaces it - but using highlighting
> instead of fringe.  I've been using that for years myself, so I obviously 
> prefer
> it - I generally don't show the fringe.)

But the value `t' already does that - it highlights the locus until some
other locus replaces it.