docs: public int compareSourceLines(BugCollection lhsCollection, BugCollection rhsCollection, SourceLineAnnotation lhs,
              SourceLineAnnotation rhs) {
          if (lhs == null || rhs == null) {
              return compareNullElements(lhs, rhs);
          }
  
          // Classes must match fuzzily.
          int cmp = compareClassesByName(lhsCollection, rhsCollection, lhs.getClassName(), rhs.getClassName());
          if (cmp != 0) {
              return cmp;
          }
  
          return 0;
      }