Qt 5 to-do's in QSizePolicy

    // ### Qt 5: merge these two constructors (with type == DefaultType)
    QSizePolicy(Policy horizontal, Policy vertical)
        : data(horizontal | (vertical << HSize)) { }
    QSizePolicy(Policy horizontal, Policy vertical, ControlType type)
        : data(horizontal | (vertical << HSize)) { setControlType(type); }
...
    quint32 data;
/*  Qt5: Use bit flags instead, keep it here for improved readability for now.
    We can maybe change it for Qt4, but we'd have to be careful, since the behaviour
    is implementation defined. It usually varies between little- and big-endian compilers, but
    it might also not vary.
    quint32 horzPolicy : 4;
    quint32 vertPolicy : 4;
    quint32 hfw : 1;
    quint32 ctype : 5;
    quint32 wfh : 1;
    quint32 padding : 1;   // we cannot use the highest bit
    quint32 verStretch : 8;
    quint32 horStretch : 8;
*/