QListWidget setSelectionModel stops emission of itemSelectionChanged signal

QAbstractItemView::setSelectionModel does not know to restore the connections created by QListWidgetPrivate::setup, so calling setSelectionModel on a QListWidget breaks the connections to QItemSelectionModel signals. Moving those connections from QListWidgetPrivate::setup to a new QListWidget::setSelectionModel override function fixes the problem. See attached modified files.

(See also http://forum.qt.io/topic/63674/qlistwidget-setselectionmodel-stops-emission-of-itemselectionchanged-signal.)