[ui:cwd] correction for touch device (support long tap) & syntax strictly

ref. #266

Tap: Item select or Similar dblClick (selected item)
Long-tap: Similar dblClick (When nothing is chosen) or Multi (un)select
(When some are chosen)
Merge branch '2.x' into 2.x_n
Merge branch '2.x_n' into 2.1_n