public String @Nullable [] getSelectedGroupPath() {
    TreePath commonPath = TreePathUtil.findCommonAncestor(getSelectionPaths());
    if (commonPath == null) return null;
    for (Object n : commonPath.getPath()) {
      if (n instanceof InspectionGroupNode) {
        return getGroupPath((InspectionGroupNode)n);
      }
    }
    return null;
  }
public String @Nullable [] getSelectedGroupPath()