@Override
	public BigInteger getIndexAfter(BigInteger index) {
		BigInteger nextIndex = index.add(BigInteger.ONE);
		if (nextIndex.compareTo(numIndexes) >= 0) {
			return null;
		}
		return nextIndex;
	}
@see docking.widgets.fieldpanel.LayoutModel#getIndexAfter(int)
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ByteViewerLayoutModel.java