Karl> I rebind my keyboard under X to swap two pairs of keys, `~ & ESC and
Karl> BS & DEL. (This is of course because such placement is The Way God
Karl> Intended Them To Be, where God was on an extended visit to DEC during
Karl> the time that DEC was creating the VT100.)
I had to set this to return to 21.0 behavior:
(setq delete-key-deletes-forward nil)