ListPreloader.cancelAll does not cancel the most recent request

[technoir42]

Preload queue has size of maxPreload + 1 but only the first maxPreload requests get cancelled. The most recent request is always the last in queue so it doesn't get cancelled.

  private void cancelAll() {
    for (int i = 0; i < maxPreload; i++) {
      requestManager.clear(preloadTargetQueue.next(0, 0));
    }
  }

[sjudd]

Thanks for reporting, please feel free to send a pull request!