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Ell authored
Finish up commit 17583ff0, which ported GimpGradient from ::duplicate() to ::copy(), by doing the same for the rest of the GimpData subclasses that implement ::duplicate(). We still keep GimpData's ::duplicate() virtual function around, even though it now points to the default implementation (which uses ::copy()) for all subclasses, since ::copy() is stronger than ::duplicate(), and we might want to have certain GimpData types that are duplicatable, but not copyable.
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