Commented Unassigned: Patch to FeatureSetExt.cs Intersection [24345]

FeatureSetExt.cs's Intersection is buggy in the FieldJoinType.ForeignOnly case. I believe this has been reported previously.

Not sure if this _ever_ worked. See patch for 3 bug fixes.

Thanks.

-Phil
Comments: Associated with changeset 74190: - Fixed error in FeatureSetExt.cs Intersection for FieldJoinType.ForeignOnly case. #24345.
- Removed dublicated code in FeatureSetExt.CombinedFields() method.