@Override
  public Object getData(@NotNull Collection<? extends AbstractTreeNode<?>> selected, @NotNull String dataId) {
    if (PlatformCoreDataKeys.BGT_DATA_PROVIDER.is(dataId)) {
      return (DataProvider)slowId -> getSlowData(selected, slowId);
    }
    return null;
  }
@Override
  public Object getData(@NotNull Collection<? extends AbstractTreeNode<?>> selected, @NotNull String dataId)