@Override
  protected void doMerge() throws VcsException {
    for (Change change : mySelectedChanges) {
      SvnRepositoryContentRevision before = (SvnRepositoryContentRevision)change.getBeforeRevision();
      SvnRepositoryContentRevision after = (SvnRepositoryContentRevision)change.getAfterRevision();

      if (before == null) {
        //noinspection ConstantConditions
        add(after);
      }
      else if (after == null) {
        delete(before);
      }
      else {
        merge(before, after);
      }
    }
  }
@Override
  protected void doMerge()