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A requester appears in a Layer.  By default, the requester layer is of
type LAYERSMART, or, in window terminology, WFLG_SMART_REFRESH; so
rendering is preserved in the requester when the window is moved or

Requesters may also be simple refresh.  This is the recommended type.  If
possible, make the requester a simple refresh layer requester by
specifying the SIMPLEREQ flag.

For all refresh types, Intuition will keep the gadget, border, image and
bitmap imagery properly refreshed.