areas, pass into draw whether to show it highlighted, and fire a util
method when it's clicked on. Intent is that platforms show the
remaining tiles dialog.
not dived and tray or scoreboard focussed. This lets platform decide
to display top-level focus via mods to all elements. Second, when
moving focus to top level from dived, claim not to have handled the
key event (but return true if needs redraw). This allows platform to
handle shifting focus without requiring callback (which removed.)
