message: Forward signals/slots as well in ForwardingDelegate
diff: @@ -427,7 +427,28 @@ class ForwardingDelegate : public QStyledItemDelegate
  public:
  explicit ForwardingDelegate(QObject *parent = NULL) : QStyledItemDelegate(parent) {}
  ~ForwardingDelegate() {}
  - void setForwardDelegate(QAbstractItemDelegate *real) { m_delegate = real; }
  + void setForwardDelegate(QAbstractItemDelegate *real)
  + {
  + if(m_delegate)
  + {
  + QObject::disconnect(m_delegate, &QAbstractItemDelegate::commitData, this,
  + &QAbstractItemDelegate::commitData);
  + QObject::disconnect(m_delegate, &QAbstractItemDelegate::closeEditor, this,
  + &QAbstractItemDelegate::closeEditor);
  + QObject::disconnect(m_delegate, &QAbstractItemDelegate::sizeHintChanged, this,
  + &QAbstractItemDelegate::sizeHintChanged);
  + }
  + m_delegate = real;
  + if(m_delegate)
  + {
  + QObject::connect(m_delegate, &QAbstractItemDelegate::commitData, this,
  + &QAbstractItemDelegate::commitData);
  + QObject::connect(m_delegate, &QAbstractItemDelegate::closeEditor, this,
  + &QAbstractItemDelegate::closeEditor);
  + QObject::connect(m_delegate, &QAbstractItemDelegate::sizeHintChanged, this,
  + &QAbstractItemDelegate::sizeHintChanged);
  + }
  + }
  void paint(QPainter *painter, const QStyleOptionViewItem &option,
  const QModelIndex &index) const override
  {
  