A gradient instance in a one-paint style marked both the fill and the
stroke as not read, so a style with a solid fill and a stroke gradient
was left out even when its `Xd` turns on only the fill. The instance's
flag (`1 Bb` for the stroke) now says which side the gradient paints, as
the object reader reads it; a gradient outside an instance still marks
both.
dotCooCoo
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