so that the subclasses use the right overrides to implement custom behaviour Change-Id: Ida9d1de51b5595c4d9532a5c98a220bf39d9a208 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/149940 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>