^X^W and GTJFN defaults

[Michael J. Konopik <ZZZ@SRI-NIC.ARPA>]

When I use ^X^S to save a file, emacs knows what filename to which the
buffer is written.  How come, then, ^X^W can't have the GTJFN defaults
initialized?  This all-or-nothing behavior makes it difficult to write
the file to a new extension when the filename is too long to all fit on
the mode line (f'rinstance, writing THIS-IS-A-LONG-FILE.TXT out to
THIS-IS-A-LONG-FILE.NEW).
It's been awhile since I used emacs on Twenex, but I coulda sworn that
this worked at MIT as recently as 1987...
Thanks.
				-Mike
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