bug#6609: 23.2; Cursor becomes invisible when put over some faces

[Eli Zaretskii]

> From: Deniz Dogan <deniz.a.m.dogan@gmail.com>
> Date: Sun, 11 Jul 2010 19:02:21 +0200
> Cc: 6609@debbugs.gnu.org
> 
> >> What happens if you evaluate this:
> >>
> >>  (set-face-background 'cursor "black")
> >>
> >
> > It returns nil and doesn't seem to have any effect on the problem I'm 
> > having.
> >
> 
> Actually, it seems to make the cursor black, "covering" text with the
> default face. So now I can sort of guess where the cursor is by
> looking for gaps in the text, but it's of course still not
> satisfactory.

And if you use a color other than black? does the above has the
expected effect?

IOW, is the problem only with the black color, or with any color, as
far as the `cursor' face is concerned?