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

[Stefan Monnier]

> i.e. we end up with a visible frame, the frame that we hid initially.

As mentioned, part of the reason is that raise-frame incorrectly makes
the frame visible.

Admittedly, the correctness is debatable, since the docstring says "If
frame is iconified, make it visible" whereas the Elisp manual says "If
FRAME is invisible or iconified, this makes it visible".  So the code is
correct w.r.t the Elisp manual but not the docstring.  I actually
believe the docstring describes the behavior we want.


        Stefan