Address a ### Qt6 comment from change
283008e123, and start using
QStyledItemDelegate in more places, so those get proper
look and feel.
Change-Id: I39767ba99b7942faada1fba0ac241deb35563b63
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>