instead of spreading calls to Which() everywhere.

Change-Id: Ie32d106e44f5cb583908eeebe254ab8b8168ae61
Reviewed-on: https://gerrit.libreoffice.org/44760Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>