so ... this scroll is harder than I thought -- I see why failure is an
automatic C (-30) on this assignment. Not very straight forward. So,
anyway, have some code I was messing with commented out, soon to be
deleted. I have added to advanceLine() detecting when Y > Canvas size
and increase the canvas size -- BUT -- I lose the original text. How
will we recapture that text? Or preserve it? idk... yet.