code: private <E> boolean isFullyModified(List commonAncestor, Patch<E> patchCurrent) {
          return patchCurrent.size() == 1 && commonAncestor.size() == patchCurrent.get(0).getPrevious().size();
      }
docs: Check if the content is completely different between the ancestor and the current version
  
  @param <E> the type of compared elements
  @param commonAncestor previous version
  @param patchCurrent patch to the current version
  @return either or not the user has changed everything