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

[Drew Adams]

> > Users should not have to customize anything to get unbugged behavior
> > using emacs -Q.  If the source file is already showing, why 
> > pop it up again in a new window, by _default_?
> 
> When using virtual frames on a single-window xterm, such 
> behavior is annoying:
> displaying the source file has no visual effect at all 
> because it's displayed
> on a hidden virtual frame.  Please see more at
> http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01638.html

Sounds like a corner case that should be handled specially.  No, I'm no expert
on this, and yes, I can imagine that someone might sometimes like the current
behavior (even outside a xterm virtual frames context).  Still, in general it
seems like a bad default behavior.