/// <inheritdoc />
public void Add(T item)
{
var removedItem = Removed.FirstOrDefault(c => object.Equals(c.Item, item));
if (removedItem != null)
{
// Adding an item that was removed.
Removed.Remove(removedItem);
removedItem.Item = item;
removedItem.Action = ChangeAction.None;
Items.Insert(removedItem.Index, removedItem);
}
else
{
Items.Add(new ChangeContainerItemWithIndex <T>(item, ChangeTarget.Collection, Items.Count, ChangeAction.Add));
}
}