message: getSliceLoci tweak
diff: @@ -153,6 +153,8 @@ function getSliceLoci(pickingId: PickingId, volume: Volume, props: PD.Values<Sli
  const granularity = Volume.PickingGranularity.get(volume);
  if (granularity === 'volume') {
  return Volume.Loci(volume);
  + } if (granularity === 'object') {
  + return getLoci(volume, props);
  } else {
  return Volume.Cell.Loci(volume, Interval.ofSingleton(groupId as Volume.CellIndex));
  }
  