code: public void updateAfterInsert(Suffix<T, S> suffix) {
          if (activeNode == root && suffix.isEmpty()) {
              activeNode = root;
              activeEdge = null;
              activeLength = 0;
          } else if (activeNode == root) {
              Object item = suffix.getStart();
              activeEdge = root.getEdgeStarting(item);
              decrementLength();
              fixActiveEdgeAfterSuffixLink(suffix);
              if (activeLength == 0)
                  activeEdge = null;
          } else if (activeNode.hasSuffixLink()) {
              activeNode = activeNode.getSuffixLink();
              findTrueActiveEdge();
              fixActiveEdgeAfterSuffixLink(suffix);
              if (activeLength == 0)
                  activeEdge = null;
          } else {
              activeNode = root;
              findTrueActiveEdge();
              fixActiveEdgeAfterSuffixLink(suffix);
              if (activeLength == 0)
                  activeEdge = null;
          }
      }
docs: Resets the active point after an insert.
  
  @param suffix
  The remaining suffix to be inserted.