/// ------------------------------------------------------------------------------------
/// <summary>
/// Returns a value indicating whether the given boundary cannot be deleted or moved in
/// either direction. A boundary is absolutely "permanent" if the time tier has readonly
/// ranges. Typically it will also be considered permanent if it is adjacent to a
/// segment that already has an oral annotation (text annotations can also prevent moves
/// if PreventSegmentBoundaryMovingWhereTextAnnotationsAreAdjacent is set); however, the
/// caller can elect to disregard annotations when determining this.
/// </summary>
/// ------------------------------------------------------------------------------------
public bool IsBoundaryPermanent(TimeSpan boundary, bool disregardAnnotations = false)
{
return(TimeTier.ReadOnlyTimeRanges || (!disregardAnnotations &&
Tiers.HasAdjacentAnnotation((float)boundary.TotalSeconds)));
}