appearance.addFill, appearance.addStroke and appearance.duplicateItem can
put a new topmost row on a series mark with the paint the mark already
shows. When another mark of the series had set a different stored paint,
the mark's top paint did not change, so the graph kept the other mark's
paint and drew it again. A new topmost visible row now stores its paint,
as an Eyedropper append already does.
dotCooCoo
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