mh-show-buffer-message-number

mh-show-buffer-message-number is an autoloaded compiled Lisp function in `mh-comp.el'.

(mh-show-buffer-message-number &optional BUFFER)

Message number of displayed message in corresponding show buffer.

Return nil if show buffer not displayed.
If in `mh-letter-mode', don't display the message number being replied
to, but rather the message number of the show buffer associated with
our originating folder buffer.
Optional argument BUFFER can be used to specify the buffer.