Replace `(function (lambda' by `(lambda' throughout.
(rmail-sort-by-date, rmail-sort-by-subject) (rmail-sort-by-author, rmail-sort-by-recipient) (rmail-sort-by-correspondent, rmail-select-correspondent) (rmail-sort-by-lines, rmail-sort-by-labels, rmail-sort-messages) (rmail-make-date-sortable): Doc fixes. (rmail-sort-by-correspondent): Downcase correspondents. (rmail-sort-by-labels): Make it work. (rmail-sort-messages): Restore undo if it was initially enabled. Fix bobp/bolp typo that was adding a line on every sort.
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