qmllint/qmlsc fails to recognize Q_INVOKABLE function parameters of enum type unless fully qualified in signature

When using qmllint on a QML application that calls a C++ Q_INVOKABLE method with a parameter of an enum type declared within the class, qmllint issues a warning about argument count/type if the enum type in the method signature is not fully qualified with the class name. 

If the C++ method is declared as:

class MyItem : public QObject {
    Q_OBJECT
public:
    enum Operation {
        Normal,
        Immediate
    };
    Q_ENUM(Operation)
    Q_INVOKABLE void doSomething(Operation op = Normal) { /* ... */ }
};

Then a QML call like:

MyItem { id: item }
Component.onCompleted: item.doSomething(item.Immediate)

generates a warning:

Function expects 0 arguments, but 1 were provided type Operation for argument 0 cannot be resolved [compiler]

When the method is declared as:

Q_INVOKABLE void doSomething(MyItem::Operation op = MyItem::Normal);

The warning goes away.

This issue is not limited to user-defined types: it also affects several built-in QtQuick QML types such as StackView and TableView. For example, methods like StackView.popToItem(item, StackView.Immediate) and TableView.positionViewAtRow(row, TableView.Visible, 0.0) will trigger similar warnings from qmllint.