e.g. copy-DnD with Ctrl held down. This is qt5 remix of tdf#109227

Change-Id: Ib0794c7468cc04d3d50686952305717e10c90c9a
Reviewed-on: https://gerrit.libreoffice.org/72878
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>