@NotNull
  public Collection<AbstractTreeNode<?>> getDirectoryChildren(final PsiDirectory psiDirectory,
                                                           final ViewSettings settings,
                                                           final boolean withSubDirectories) {
    return getDirectoryChildren(psiDirectory, settings, withSubDirectories, null);
  }
@NotNull
  public Collection<AbstractTreeNode<?>> getDirectoryChildren(final PsiDirectory psiDirectory,
                                                           final ViewSettings settings,
                                                           final boolean withSubDirectories)