PropertyHandle :: Intersect - Intersect collections

The result collection contains all instances that are contained in each operand collections. The existence of an instance in a collection can be checked based on the sort key (passing YES for ik_opt) or on local identities (LOID). Using the LOID is save but comparing the key is much faster. Hence, the key check should be used whenever possible.

Calling the function with one operator creates the intersection between the calling and the passed collection and stores the result in the calling collection. Otherwise the operation is performed with the passed operands storing the result in the collection referenced by the calling property handle. When the calling property handle refers to a non empty collection all instances are removed before performing the operation. When the calling property handle is empty the function creates a temporary extend for storing the result.