public override void Insert(int index, DomNode item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
int currentIndex = IndexOf(item);
if (currentIndex == index)
{
return;
}
if (currentIndex >= 0)
{
_items.Remove(item);
index = Math.Max(0, index - 1);
}
if (item.IsDocumentFragment)
{
InsertRange(index, item.ChildNodes);
}
else
{
Entering(item, null);
_items.Insert(index, item);
item.NotifyParentChanged();
_owner.ChildNodeChanged(DomMutation.Add, item, GetPreviousSibling(item), GetNextSibling(item));
}
}
