Prevents that selected objects shadow selecting others in front of them.

Change-Id: Iee4abf4eddf79ef7ed331221b0a0b23d3370ae2b
Signed-off-by: Lennard <Wasserthal@nefkom.net>
Reviewed-on: https://gerrit.libreoffice.org/927Reviewed-by: Thorsten Behrens <tbehrens@suse.com>
Tested-by: Thorsten Behrens <tbehrens@suse.com>