Drag&Drop Undo is a special case of ownership..

Change-Id: I2fe7769c4d84efe09d432335d5d8e72d506bf7a1
(cherry picked from commit 44f34c11)
Reviewed-on: https://gerrit.libreoffice.org/18470Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>