Some misunderstandings with Q_ENUMS and Q_INVOKABLE when inheriting, why?

Question

Qt

Greetings
Let's say there is a class with enums, for example

class CommunicationEnums {
public:
    CommunicationEnums() {}

    enum EButtons {
        BTN_LEFT = 2,
        BTN_RIGHT = 4,        
    };
};

Another class is inherited from it, for example

class AppCore : public QObject, public CommunicationEnums
{
    Q_OBJECT
    Q_ENUMS(EButtons)
    ....... 
public:      
   Q_INVOKABLE void processButton(EButtons button);
   .......

I register it

qmlRegisterUncreatableType<AppCore>("AppCore", 2, 0, "AppCore", "Only enums");

and pass it to QML
If I write in QML:
console.log(AppCore.BTN_LEFT)
as expected, it displays 2
But if I try to call the function , it
appCore.processButton(AppCore.BTN_LEFT);
displays

Error: Unknown method parameter type: EButtons

Moreover, if enum { ... } transferred to AppCore, then the function call is normal O_o
Em, what to do and who is to blame?

Answer 1

1. Try registering the enum itself like this:
Q_DECLARE_METATYPE(CommunicationEnums::EButtons)
and
qmlRegisterUncreatableType("EButtons", 1, 0, "EButtons", "Error class uncreatable");
2. As far as I remember, there was such a problem in 5.2, they even found a bug with a description in the Qt bugtracker. The bottom line is that the meta-object system did not register enumerations normally and they had to be duplicated in each class that was accessed from QML.
What version of Qt do you have?