/// <summary>
/// Appends text to this rope.
/// Runs in O(lg N + M).
/// </summary>
/// <exception cref="ArgumentNullException">newElements is null.</exception>
public static void AddText(this Rope <char> rope, string text)
{
InsertText(rope, rope.Length, text);
}
/// <summary>
/// Appends another rope to the end of this rope.
/// Runs in O(lg N + lg M), plus a per-node cost as if <c>newElements.Clone()</c> was called.
/// </summary>
/// <exception cref="ArgumentNullException">newElements is null.</exception>
public void AddRange(Rope <T> newElements)
{
InsertRange(this.Length, newElements);
}