* wl-thread.el (wl-thread-msg-mark-as-read): Abolished.

* wl-thread.el (wl-thread-msg-mark-as-read): Abolished.
(wl-thread-msg-mark-as-unread): Ditto.

* wl-summary.el (wl-summary-sync-marks): Delete argument 'no-cache.
(wl-summary-mark-as-unread): Check return value of `elmo-mark-as-read'.
(wl-summary-mark-as-read): Invert the meaning of 6 th argument.
Don't set mark in summary if return value of `elmo-mark-as-read' is nil.
Use `wl-summary-mark-as-read' instead of `wl-thread-msg-mark-as-read'.
(wl-summary-mark-as-read-region):  Use `wl-summary-mark-as-read'
instead of `wl-thread-msg-mark-as-read'.
(wl-summary-mark-as-unread-region): Ditto.
(wl-summary-target-mark-mark-as-read): Ditto.

* wl-score.el (wl-summary-score-update-all-lines): Ditto.