private void processLastRanges() {
    if (myRanges.size() < 2) return; // nothing to do

    Range range1 = myRanges.get(myRanges.size() - 2);
    Range range2 = myRanges.get(myRanges.size() - 1);
    if (range1.end1 != range2.start1 && range1.end2 != range2.start2) {
      // if changes do not touch and we still can perform one of these optimisations,
      // it means that given DiffIterable is not LCS (because we can build a smaller one). This should not happen.
      return;
    }

    int count1 = range1.end1 - range1.start1;
    int count2 = range2.end1 - range2.start1;

    int equalForward = expandForward(myData1, myData2, range1.end1, range1.end2, range1.end1 + count2, range1.end2 + count2);
    int equalBackward = expandBackward(myData1, myData2, range2.start1 - count1, range2.start2 - count1, range2.start1, range2.start2);

    // nothing to do
    if (equalForward == 0 && equalBackward == 0) return;

    // merge chunks left [A]B[B] -> [AB]B
    if (equalForward == count2) {
      myRanges.remove(myRanges.size() - 1);
      myRanges.remove(myRanges.size() - 1);
      myRanges.add(new Range(range1.start1, range1.end1 + count2, range1.start2, range1.end2 + count2));
      processLastRanges();
      return;
    }

    // merge chunks right [A]A[B] -> A[AB]
    if (equalBackward == count1) {
      myRanges.remove(myRanges.size() - 1);
      myRanges.remove(myRanges.size() - 1);
      myRanges.add(new Range(range2.start1 - count1, range2.end1, range2.start2 - count1, range2.end2));
      processLastRanges();
      return;
    }


    Side touchSide = Side.fromLeft(range1.end1 == range2.start1);

    int shift = getShift(touchSide, equalForward, equalBackward, range1, range2);
    if (shift != 0) {
      myRanges.remove(myRanges.size() - 1);
      myRanges.remove(myRanges.size() - 1);
      myRanges.add(new Range(range1.start1, range1.end1 + shift, range1.start2, range1.end2 + shift));
      myRanges.add(new Range(range2.start1 + shift, range2.end1, range2.start2 + shift, range2.end2));
    }
  }
private void processLastRanges()