As an aside - I only just now noticed there was a WigglyPaint retrospective.
Related to that - in my attempts for making this easier to use:
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make compositing order implicit based on the card order, since there’s already the ability to reorder cards
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make the background automatically the composite target
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probably all that is wanted is underpaint/masking, so I’ll probably remove operator selection. or make it less up front and center
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I like the palette/swatch selection. so make it go directly to a “physical palette” where you can select the pattern visually with a select tool. apply your patterns in swatches like paint. kind of like how layercake can be used now to lift brushes off the palette.
this will remove all of the buttons and probably all that’s needed is a few hot keys to operate the layercake tool.