Not directly related to tdf#123736 but similar approach.
Setting a vector with ScColumn::SetFormulaCells() is currently
only done for Undo documents, but implementation provided
listening as only single cell listening for not-undo/clip
documents, which wouldn't work if actually used in grouping
context. The upcoming unit tests will use SetFormulaCells() for
checks.

Change-Id: I990e6a5d6e1efcf70a2661b3a9a39c37d9e4c2e6
Reviewed-on: https://gerrit.libreoffice.org/69371Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins