in sync with the board rather than the model and flipping coordinates
only in time to access the model or pass to engine. With that done,
drawing can skip any rows scrolled off-screen, and the board's
perimeter focus rect can be drawn and invalidated correctly on a
flipped, scrolled screen: zodiac, eventually.
of CELL_ISCURSOR consistent: when focus not dived all elements have it
set (or only perimeter for board, settable at compile time); get rid
of draw_drawCursor since CELL_ISCURSOR is all that's needed;
as penDown. Idea is to be able to set timers to get bonus square
hints etc. without stylus. Works, but transitions are rough because
keyDown doesn't know whether keyUp will result in a focus change.
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.)
