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OK used to save None for a corner tile the dialog showed as None because the brush had no art or source for it, so that corner stopped drawing the other kind of corner's art once the brush got some. It also copied the art a corner borrows from the other kind of corner when that corner kept its art. Now OK saves a corner tile's choice only when it was set from its menu or with `ui.dialog.set`, or when the art it borrows goes away.