QVector / QList with enum shows raw view or wrong value during debugging.

When debugging in Visual Studio 2015, variables of QVector or QList containing an enum type may have incorrect display in DataTip and Watch Windows.

Case 1: When the enum type and the QVector/QList variable are in the same function, the variable only shows raw view.
Case 2: When the enum type is outside the function or in the header file, the QVector displays correctly, but the QList shows random int.

Example:

enum E_Types
{
    Type_One,
    Type_Two,
    Type_Three,
};
// In case 1: vt.d displayed.
// In case 2: vt's three elements displayed correctly.
QVector<E_Types> vt;
vt << Type_One << Type_Two << Type_Three;
// In case 1: lt.p, lt.d displayed.
// In case 2: lt's three elements displayed in random int.
QList<E_Types> lt;
lt << Type_One << Type_Two << Type_Three;