@Override
  void addStub(@NotNull StubBase<?> stub, @Nullable StubBase<?> parent, @Nullable IStubElementType<?, ?> type) {
    super.addStub(stub, parent, type);
    myPlainList.add(stub);
  }
@Override
  void addStub(@NotNull StubBase<?> stub, @Nullable StubBase<?> parent, @Nullable IStubElementType<?, ?> type)