bug#16967: frame related race condition

[martin rudalics]

>> I checked in a fix in revision 116716.  With that I can't see the
>> problem any more.  Can you?
>
> No, but it has a much bigger problem:
>
>  emacs -Q --eval "(make-frame '((visibility . nil)))"
>
> and you end with two visible frames.
>
> I think we're rehashing part of bug#14841's thread.

When we get a SIZE_RESTORED message we have to make the frame visible.
Do you see another way?

martin