> Whatever we do here we won't fix the principal problem with next_frame
 > namely that
 >
 > (progn
 >    (set-frame-parameter nil 'no-other-frame t)
 >    (next-frame nil 0))
 >
 > can loop forever.

The attached patch includes my earlier proposal for fixing this and also
reverts the return value of 'make-frame-names-alist'.  Please try it.

Thanks, martin