Fixes: NB#159761 -  DuiList does not update correctly on insertRows() and setData()
Fixes: NB#159761 -  DuiList does not update correctly on insertRows() and setData()

Details: Invalidates first and last visible rows when the visible items array is discarded.

nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch