/// <summary>
/// Adds an item at a specific index for a block collection.
/// </summary>
public static void AddAt(this BlockCollection collection, int index, Block item)
{
if (index == -1)
{
return;
}
if (collection.Count == 0)
{
collection.Add(item);
return;
}
index = Math.Min(index, collection.Count - 1);
collection.InsertAfter(collection.ElementAt(index), item);
}