The color sliders now mark the row they edit with `model: "new"`
instead of a dialog-wide flag, and `recolor.apply` reads a row's own
`model` before the command's. Rows the sliders did not edit keep each
color's model, so with RGB art and a CMYK color group, a slider edit of
one row no longer turns the other rows' art CMYK. Another edit of the
row's new color, Reset and rows reduced again remove the mark, and
`recolor.randomize` moves it with its new color.
dotCooCoo
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