result = SetGadgetAttrsA( Gadget, Window, Requester, TagList )
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ULONG SetGadgetAttrsA( struct Gadget *, struct Window *,
struct Requester *, struct TagItem * );
result = SetGadgetAttrs( Gadget, Window, Requester, Tag1, ...)
ULONG SetGadgetAttrs( struct Gadget *, struct Window *,
struct Requester *, ULONG, ... );