@Override
  public @NotNull String dumpState() {
    return "UndoableGroup[project=" + myProject + ", name=" + myCommandName + ", global=" + myGlobal + ", transparent=" + myTransparent +
           ", stamp=" + myCommandTimestamp + ", policy=" + myConfirmationPolicy + ", temporary=" + myTemporary + ", valid=" + myValid +
           ", actions=" + myActions + ", documents=" + getAffectedDocuments() + "]";
  }
@Override
  public @NotNull String dumpState()