Direction of a Selection Range - how to?

I am playing around with selection ranges and changing them - but I have a problem. It looks like it is impossible to test weather a range goes from Left_To_Right or from Right_To_Left...

I have tried

node.getPosition(otherNode)

- but this always gives me a Left_To_Right direction (or a CKEDITOR.POSITION_IDENTICAL)???

Any ideas?