@Override
	public FieldLocation getFieldLocation(ListingField bf, BigInteger index, int fieldNum,
			ProgramLocation programLoc) {

		if (!(programLoc instanceof IndentFieldLocation)) {
			return null;
		}
		if (!hasSamePath(bf, programLoc)) {
			return null;
		}
		return new FieldLocation(index, fieldNum, 0, 0);
	}
@see ghidra.app.util.viewer.field.FieldFactory#getFieldLocation(ghidra.app.util.viewer.field.ListingField, BigInteger, int, ghidra.program.util.ProgramLocation)
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/OpenCloseFieldFactory.java