New property introduced in d77f8eef
expected to be backported to 6.1

Change-Id: I6486fa0f42adcd39c9929f4d90b7310e22d851c6
Reviewed-on: https://gerrit.libreoffice.org/56685Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>