QDir is missing Q_FLAGS call for the property "Filters"

Problem:
QDir::Filters is not a meta-type
Impact:
QDir::Filters not being a meta-type, Qt Designer (or QtScript) can't handle the property as a type.

As an example, I have a custom QWidget with the following body:
class MyCustomWidget :public QWidget{
Q_OBJECT
Q_PROPERTY(QDir::Filters filters READ filters WRITE setFilters)
public:
...
void setFilters(const QDir::Filters& filters);
const QDir::Filters& filters()const;
};

If the widget is inside a Designer plugin, then when the Qt Designer is started, the following message is printed:
MetaProperty::read: Unable to handle unregistered datatype 'QDir::Filters' for property 'MyCustomWidget::filters'

Solution:
Call Q_FLAGS(Filter Filters) inside qdir.h in addition to the already existing Q_DECLARE_FLAGS(Filters, Filter) and Q_DECLARE_OPERATORS_FOR_FLAGS(QDir::Filters)