@Nullable
  public ChangesViewContentProvider.Preloader newPreloaderInstance(@NotNull Project project) {
    if (preloaderClassName == null) {
      return null;
    }
    return (ChangesViewContentProvider.Preloader)newClassInstance(project, preloaderClassName);
  }
@Nullable
  public ChangesViewContentProvider.Preloader newPreloaderInstance(@NotNull Project project)