code: protected void load() {
          if (loader == null) {
              setInfiniteScrollLoader(new InfiniteScrollLoader());
          }
  
          offset = loadConfig.getOffset();
          limit = loadConfig.getLimit();
          load(offset, limit);
      }
docs: Will load the initial data and initialize the buffer top and bottom
  of the scroll panel providing a target threshold on scrolling both top / bottom positions.