... also if other references are not updated. References to other sheets
are never to be treated as relative during sort, they are always
absolute, even if they have relative row/column part references.

Broken again during the big sort mess. Even if there was a unit test,
which didn't help as it got disabled / adapted to the change..

Change-Id: Ic0e61c5e1cb0728e20725c29e450ab0eb55c3305