add: dired cursor upon file I was just in

[Dan Jacobson]

Fellas, (or fella (or big fella (or you know who, in particular))),
consider the case when you are in a file, be it editing, or just
viewing, and you get the urge for dired.  You hit C-x d RET.  Why not
have the cursor in that (fresh) dired be resting on the file you were
just on, instead of stubbornly at the first file of the directory?

Yes, this optional behavior would have a variable to turn it off for
the old fuddies.

Dan wants you to add this new feature to emacs.
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