Replace it with additional GroupItem's c'tors.
This addresses the 27th point in the report below.
Task-number: QTCREATORBUG-28741
Change-Id: I7f0620993e7c9bf61868e7bc7b112eea4dae6471
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>