... if at least one of the sheet names has to be quoted, instead
of 'Sheet1':'Sheet2'!C4:C4 where 'Sheet1':'Sheet2' is more logical
but not understood neither by Excel nor was it by Calc. A single
C4 instead of C4:C4 is more cosmetical.
Accept both forms now when reading OOXML documents to be able to
read back such broken expressions.
Change-Id: I228e458e2e3af387d9f89900fcfc16ab89757bae
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/175514
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>
472f17d203