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This resembles the 2001-05-07 change to rmail-output-read-rmail-file-name,
which was never copied to rmail-output-read-file-name.
It's more complicated now due to Rmail's buffer swapping.

* lisp/mail/rmailout.el (rmail-output-read-file-name):
Check rmail-output-file-alist against the full message body
in the correct rmail buffer.

* lisp/mail/rmail.el: Comment.