* wl-summary.el (wl-summary-buffer-message-redisplay-func): Removed.

* wl-summary.el (wl-summary-buffer-message-redisplay-func): Removed.

* wl-vars.el (wl-cache-prefetch-get-next-func): Ditto.

* wl-draft.el (wl-caesar-region-func): Ditto.

* wl-summary.el (wl-summary-exec-subr): Fixed `copy';
 Keep unread status in elmo-folder-move-messages.
 (wl-summary-sync-update): Set `wl-summary-buffer-msgdb'.

* elmo.el (elmo-folder-have-subfolder-p): New generic function.

* elmo-mark.el (elmo-folder-have-subfolder-p): Define.

* elmo-internal.el (elmo-folder-list-subfolders): Rewrite.