code: String concatIconTitles(String main, String secondary) {
  
          if (main == null) {
              main = "";
          }
          if (secondary == null) {
              secondary = "";
          }
  
          if (secondary.length() == 0) {
              return main;
          }
          return main + " [" + secondary + "]";
  
      }
docs: Combines the main icon title with the title for a status icon overlayed over the main icon.<p>
  
  @param main the main icon title
  @param secondary the secondary icon title
  
  @return the combined icon title for the secondary icon