Rewriting GUI for update rectangles is going to be worse than I thought. There are manual updates in some wrong places, namely in text output routines and keyboard routines. It was quick and dirty way to implement some linked updates, but they were in wrong place. Things like that should be there, but they belong to GUI. Text update is silly, because text is usually printed on some self-updating surface like window or gui background graphics. That's why there are double updates in most text routines.
It's more complete rewrite than I thought, but essential for that consistent flow of drawing and updating.
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