code: public boolean isRecurse(VirtualFile file) {
          boolean recurse = false;
          if (recurseFilter != null) { recurse = recurseFilter.accepts(file); }
          return recurse;
      }
docs: Whether to recurse into the non-leaf file<p>. If there is a recurse filter then the result will by its
  accepts(file) value.
  <p/>
  Default: false
  
  @param file the file
  @return the recurse flag.