Add handling of the focus chain to QGraphicsItem::setFlags(), so that
the focus chain is repaired (panels pop out of the chain and non-panels
merge back in) when the ItemIsPanel flag is toggled. Add handling focus
chain to QGraphicsWidgetPrivate::fixFocusChainBeforeReparenting for
panels.
Before this fix, you must enable the ItemIsPanel flag before adding
the item as a child to a parent panel, and you lose focus when using
the tab key to focus around a panel after it has been reparented into
another panel.
Task-number: QTBUG-28187
Change-Id: I1d0d81a90697eaf715a8a337c8bf6c2159329e68
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
4a9c3b2433