"Add definition" fails to include fully qualified name of template type alias declared within class

Consider the following class:

class Foo
{
public:
    template<class T>
    using Result = std::variant<int, T>;

    Result<float> getBar();
};

When the user tries to add the definition of `Foo::getBar()` using "Refactor"->"Add definition", Qt Creator fails to include the fully qualified name of the function's return type, thus resulting in broken code.