Missing Design-Time checks for QML enumeration properties

https://doc.qt.io/qt-5/qml-enumeration.html For backwards compatibility, the enumeration value may also be specified as a string, e.g. "AlignRight". This form is not recommended for new code.

Currently QtCreator does not mark invalid enumeration values, when using the suggested assignment for new code from the documentation.
However, the old way of assigning a string value to an enumeration receives error checking.
See attached image

We should include error checking for the recommended enumeration assignments aswell.