for their preview widgets. since...
commit 4be44a7a6f
Date: Thu May 24 19:09:44 2018 +0200
SOSAW080: Cleanup of SdrModel
Change-Id: I102b64bdacc56a41091bbe60e932c2915f20323f
Reviewed-on: https://gerrit.libreoffice.org/58693
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@cib.de>