Make raise-frame work on Cygwin

[Katsumi Yamaoka]

Hi,

raise-frame doesn't pop up an existing frame on Cygwin (rootless).
If there are many frames on a Windows screen, we have no means to
pop up a certain Emacs frame that is hidden by the other frames,
except for manually digging it up by mouse.  But at last I found
a workaround:

(defadvice raise-frame (before make-it-work (&optional frame) activate)
  "Make it work on Cygwin."
  (when frame (make-frame-invisible frame)))

iconify-frame instead of make-frame-invisible there has no effect.
It also revealed that some ELisp applications call raise-frame two
or more times at a time since a raised frame blinks. ;-)

BTW, I still use wmctrl on Fedora:
http://lists.gnu.org/archive/html/emacs-devel/2006-10/msg01117.html