QDoc fails to resolve function arguments with namespaces

Assume a type in a namespace, like "MyNamespace::Foo".

If a function/method is declared with

void myfun(MyNamespace::Foo foo);

but the function definition leaves out the namespace via a using directive

using MyNamespace;

/*!
    The myfun function does nothing
*/
void myfun(Foo foo) {}

The qdoc fails to associate the function definition with the function declaration and claims

(qdoc) warning: Cannot tie this documentation to anything
    [qdoc found a /*! ... */ comment, but there was no topic command (e.g., '\fn', '\page') in the comment and no function definition following the comment.]

See https://codereview.qt-project.org/c/qt-creator/qt-creator/+/311306 for a real-life example: We had perfectly working documentation for the functions in ActionManager that take a "Id" argument, as long as ActionManager and Id were in the same namespace. Now "Id" moved to the namespace "Utils", which requires us to add an error-prone \fn command to the documentation even though the function definition is still below the documentation comment.