`Parameter.isDynamicProjectionParameter` does not properly resolve generics of containing class

[mp911de]

Consider the following arrangement:

interface GenericRepository<T, ID> extends Repository<T, ID> {
	<P extends Projection<T>> Optional<P> dynamicBind(Class<P> type);
}

interface ParametrizedRepository extends GenericRepository<User, Long> {}

interface Projection<T> {
}

When comparing the method parameter Class<P> type against the return type definition, then we consider the containing class ParametrizedRepository at the parameter level (#2996) but we do not consider the containing class when introspecing the method return type.

This yields ? as parameter for Optional while the method parameter resolves correctly to Projection<User>. In a second step, we compare inner generics of the return type and therefore, the equality check fails.

While we previously always fell back to ?, fixing #2996 uncovered this bug.