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Replying to @josecastillo

getting the modal working also meant fixing a very old bug in Focus, my UI framework. Focus tracks the total dirty area of the screen and issues one partial update — but it has never worked for subviews of subviews. Now it does! Untangling this felt good :)https://github.com/joeycastillo/libros/commit/2dd2d341acbcfd9eda04ff98ea63e18fbf70d5b9

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