new file dialog for c++ class: invalid template when using QML_ELEMENT

When creating a new c++ class using the UI, With:

• base class QObject
• Add Q_OBJECT checked
• Add QML_ELEMENT checked

The generated code is invalid:

#include <QQmlEngine> is missing.

Indentation is invalid.

When using the QQuickItem base class and letting the default, indentation is also invalid but as QQuickItem is included the code compiles.