OK - it’s been redone. Hopefully this is the last one for a while.
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no more layer buttons; order is implicit on card order
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no more operation buttons; probably the only thing that is wanted is underpaint. over is achieved by reordering the cards.
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everything has a hotkey and the buttons show what they are. they can be hidden.
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UNDO! (infinite right now, but I should limit it - otherwise, you can run out of memory)
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support for the palette card: a goto/return button, an eyedropper, copy brush and pattern from palette
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probably a few other things