@NotNull
  @Override
  public ThreeState isEquals(@NotNull Change change1, @NotNull Change change2) {
    Change layer1 = getSvnChangeLayer(change1);
    Change layer2 = getSvnChangeLayer(change2);
    if (layer1 != null || layer2 != null) {
      if (layer1 == null || layer2 == null) return ThreeState.NO;
    }
    return ThreeState.UNSURE;
  }
@NotNull
  @Override
  public ThreeState isEquals(@NotNull Change change1, @NotNull Change change2)