Qt5의 비정상적인 드롭 이벤트 무시

class DragEventEater : public QObject
{
public:
    DragEventEater(QObject* parent): QObject(parent) {}
protected:
    bool eventFilter(QObject *obj, QEvent *event)
    {
        if (event->type() == QEvent::DragEnter)
        {
            if (QObject* modalWidget = QApplication::activeModalWidget())
            {
                for (; obj; obj = obj->parent())
                {
                    if (obj == modalWidget)
                    {
                        return false;
                    }
                };
                return true;
            }
        }
        return false;
    }
};