QQmlMetaType::prettyTypeName sometimes returns non-pretty name

QQmlMetaType::prettyTypeName() for a QQuickText in most cases returns "Text", but has been observed to return "QQuickText" as well.

This causes problems for tests that check for errors, such as "QML Text Cannot open:", assuming that the code in qquicktext.cpp will always get a pretty name:

qmlWarning(this) << "Cannot open: " << url.toString(); 

When debugging a reproducible case of this the `QQmlMetaType::qmlType(object->metaObject())` call returned a "QtQuick.Templates/" QmlType, while in the successful case it returned "QtQuick/Text".