bug#1032: foreground-color in default-frame-alist affects tooltips, while background-color does not

[Juanma Barranquero]

Package: emacs,w32
Version: 23.0.60

default-frame-alist affects tooltips on Windows, but the background of
the tooltip window is not affected.

With

(setq default-frame-alist
      '((background-mode  . dark)
        (background-color . "black")
        (foreground-color . "white")))

the tooltip text foreground is white, but the background is still the
default lightyellow, so the text is not visible.