QCalendarWidget does not correctly handle input by keyboard

When entering a date by keyboard in a QCalendarWidget the month is not correctly
handled when the month starts with 0. (01-01-2014). You can reproduce this with de calendarwidget example.

The problem is in the QCalendarMonthValidator class in function applyToDate:

QDate QCalendarMonthValidator::applyToDate(const QDate &date)
{
int month = m_month;
if (month < 1)
month = 1;
else if (month > 12)
month = 12;

QDate newDate(date.year(), m_month,1);
....
}

QDate newDate(date.year(), m_month,1) should be:

QDate newDate(date.year(), month,1);

because if m_month = 0 an invalid date would be produced.