/// <summary>
/// Expands the range to an integral number of enclosing units. This could be used, for example,
/// to guarantee that a range endpoint is not in the middle of a word. If the range is already an
/// integral number of the specified units then it remains unchanged.
/// For the TextUnit.Word unit with a degenerate range if the range is immediately before a word,
/// inside that word, or within the whitespace following that word (but not immediately before the next
/// word) then it will expand to include that word.
/// For the TextUnit.Format unit if the range has mixed formatting then the range starting point will
/// be moved backwards over any text that is identically formatted to that at the start of the range
/// and the endpoint will be move forwards over any text that is identically formatted to that at the
/// end of the range.
/// </summary>
/// <param name="unit">The textual unit.</param>
public void ExpandToEnclosingUnit(TextUnit unit)
{
ValidateUnitArgument(unit, "unit");
UiaCoreApi.TextRange_ExpandToEnclosingUnit(_hTextRange, unit);
}
