code: public void addFeaturePath( String featurePath, String filter ) {
          if (!featurePaths.contains(featurePath)) {
              featurePaths.add(featurePath);
              if (filter == null) {
                  filter = "";
              }
              featureFilter.add(filter);
          }
      }
docs: Add a new feature file path.
  
  <p>The order will be considered. First paths are drawn first.</p>
  
  @param featurePath the path to add.