public FieldSelection intersect(int index) {
		FieldLocation start = new FieldLocation(index);
		FieldLocation end = new FieldLocation(index + 1);

		FieldRange range = new FieldRange(start, end);
		return intersect(range);
	}
Insert all fields in the ranges in the given field selection from this one.
@param selection the field selection fields to add to this field selection.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/support/FieldSelection.java