docs: public void removeRelationshipsNotConnectedToElement(Element element) {
          if (element != null) {
              getRelationships().stream()
                      .map(RelationshipView::getRelationship)
                      .filter(r -> !r.getSource().equals(element) && !r.getDestination().equals(element))
                      .forEach(this::remove);
          }
      }