OpenTween.TweenMain.PushSelectPostChain C# (CSharp) Method

        private void PushSelectPostChain()
        {
            int count = this.selectPostChains.Count;
            if (count > 0)
            {
                var p = this.selectPostChains.Peek();
                if (p.Item1 == this._curTab)
                {
                    if (p.Item2 == this._curPost) return;  //最新の履歴と同一
                    if (p.Item2 == null) this.selectPostChains.Pop();  //置き換えるため削除
                }
            }
            if (count >= 2500) TrimPostChain();
            this.selectPostChains.Push(Tuple.Create(this._curTab, this._curPost));
        }