fix actual type arguments resolving

[pvojtechovsky]

Fixes #1218

[monperrus]

awesome! could you add a test case?

[pvojtechovsky]

I will probably have time tomorrow evening for that.
The problem was that ClassTypingContext of ForwardingNavigableMap$StandardDescendingMap was asked to adapt parameter <K> of superclass Maps.DescendingMap<K, V> of StandardDescendingMap.
There was error in algorithm that typed parameters was searched only in current type hierarchy and was not search in type hierarchy of enclosing (declaring) class. The test case should be something like

class A<T> {
 class B extends List<T> {}
}

where

new ClassTypingContext(classB).adaptType(classB.getSuperClass().getActualTypeArguments().get(0))

failed before, but should return <T> of class A.

[pvojtechovsky]

Test added

[monperrus]

thanks a lot Pavel.