bug#3303: delete-frame raises old (invisible) frame

[Stefan Monnier <monnier@iro.umontreal.ca>]

> (progn
>   (make-frame-invisible nil t)
>   (make-frame)
>   (delete-frame (selected-frame) t))

> will unexpectedly leave one frame visible and raised.

Under GNU/Linux it also leaves a frame visible and raised, but it's not
the one you think: the (selected-frame) call returns the invisible
frame, not the new frame, because `make-frame' did not select the
new frame.

So you may want to prefer

   (progn
     (make-frame-invisible nil t)
     (with-selected-frame (make-frame)
       (delete-frame (selected-frame) t)))

which at least under GNU/Linux seems to do the right thing.
Still, the

   #ifdef NS_IMPL_COCOA
     /* term gets no other notification of this */
     if (for_deletion)
       Fraise_frame(Qnil);
   #endif

in frame.c looks plain wrong and should probably just be deleted:
frame-selection is never intended to raise (or lower) any frame.
If this `raise' is really necessary, then it needs a much more extensive
comment justifying its presence.
Adrian, could you remove this code, or justify clearly why it's here?


        Stefan