The method help of paint.editGradient and docs/mcp.md said a Perceptual
gradient with spot stops becomes an image in PDF unless every other stop
is paper white, CMYK or gray. PDF export checks each stop's color as it is
written: a CMYK document, or an export that converts colors to a CMYK
destination profile, writes RGB and Lab stops in CMYK, so the gradient
becomes a DeviceN shading. Both texts now say so, and a test covers the
CMYK document and CMYK destination cases.
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