qdoc: Uses of types defined by \typealias do not link to the definition

C++ API that uses type aliases do not allow the user to navigate from the usage of the type alias (for instance in a method signature) to the definition of the type alias.

Example

https://doc.qt.io/qt-6/qtextdocument.html#setResourceProvider

Here I would expect that QTextDocument::ResourceProvider is a link that points to https://doc.qt.io/qt-6/qtextdocument.html#ResourceProvider-typedef