buffer inherit multibyteness of the current buffer.
(composition (find-composition (point) nil nil t))
(composed (if composition (buffer-substring (car composition)
(nth 1 composition))))
+ (multibyte-p enable-multibyte-characters)
item-list max-width)
(if (eq charset 'unknown)
(setq item-list
(with-output-to-temp-buffer "*Help*"
(save-excursion
(set-buffer standard-output)
+ (set-buffer-multibyte multibyte-p)
(let ((formatter (format "%%%ds:" max-width)))
(dolist (elt item-list)
(insert (format formatter (car elt)))