fdo#74553: Write unit test for this.

Change-Id: Ie33047dff35c7aa31aaed9ec6c8e1fe5f8f5b9d7
fdo#74553: Use the shared formula column position Excel tells you...

Because sometimes this may be correct.

Change-Id: Id2c47bb4ad3f91b366a25306169de58bb38c1e81