This seems to be enough to step through the buttons with the Down arrow.

Change-Id: Ib9ad76bedb6abbf87164aafdf1c95cc438af8c3d
Reviewed-on: https://gerrit.libreoffice.org/41772Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>