* wl-vars.el (wl-summary-lazy-highlight): New variable.

* wl-vars.el (wl-summary-lazy-highlight): New variable.

* wl-summary.el (wl-summary-mode): Set up window-scroll-functions
 when `wl-summary-lazy-highlight' is non-nil.
(wl-summary-goto-folder-subr): Highlight only when
 `wl-summary-lazy-highlight' is non-nil.

* wl-highlight.el (wl-highlight-summary): Fixed docstring;
 Don't display progress and highlight temp-mark when
`wl-summary-lazy-highlight' is non-nil.
(wl-highlight-summary-window): New function.

(Based on the patch from Akihiro MOTOKI <mokkun@iname.com>)