Reset now also clears the slider edit, so the preview and OK keep each
color's model again instead of sending model "new". Changing the Colors
count, a Preserve flag or Limit to Library, or pressing Reset, with the
preview on reduced the previewed colors, so the rows no longer matched
the art; the preview is now rolled back before the colors are reduced.
The Tint mode follows the swatch recolor.apply links: the first library
swatch of the library color nearest the row's new color, shown as Tint
only when that swatch is a spot color.