Intersection::indexInOutside() crashes on locally refined grids

The implementation on the leaf grid view uses the following code:

        // Move to the father of the facet until its level is the same as
        // the level of the neighbor
        FoamGridEntityImp<dimgrid-1, dimgrid, dimworld>* facet=(this->center_->facet_[this->facetIndex_]);

        while(facet->level()<(*this->neighbor_)->level())
        {
            assert(facet->father_!=nullptr);
            facet=facet->father_;
        }
        assert(facet->level()==(*this->neighbor_)->level());

This looks wrong: if the condition is true, it uses the coarser father of facet, reducing the level even further. However just using > instead doesn't handle the < case (which seems to occur as well).

Attached is a small example program demonstrating the crash. It should exit with an assertion failure.

foamgridbug2.cc