OpenTween.TweenMain.UndoRemoveTabMenuItem_Click C# (CSharp) Method

        private void UndoRemoveTabMenuItem_Click(object sender, EventArgs e)
        {
            if (_statuses.RemovedTab.Count == 0)
            {
                MessageBox.Show("There isn't removed tab.", "Undo", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            else
            {
                DetailsListView listView = null;

                TabModel tb = _statuses.RemovedTab.Pop();
                if (tb.TabType == MyCommon.TabUsageType.Related)
                {
                    var relatedTab = _statuses.GetTabByType(MyCommon.TabUsageType.Related);
                    if (relatedTab != null)
                    {
                        // 関連発言なら既存のタブを置き換える
                        tb.TabName = relatedTab.TabName;
                        this.ClearTab(tb.TabName, false);
                        _statuses.Tabs[tb.TabName] = tb;

                        for (int i = 0; i < ListTab.TabPages.Count; i++)
                        {
                            var tabPage = ListTab.TabPages[i];
                            if (tb.TabName == tabPage.Text)
                            {
                                listView = (DetailsListView)tabPage.Tag;
                                ListTab.SelectedIndex = i;
                                break;
                            }
                        }
                    }
                    else
                    {
                        const string TabName = "Related Tweets";
                        string renamed = TabName;
                        for (int i = 2; i <= 100; i++)
                        {
                            if (!_statuses.ContainsTab(renamed)) break;
                            renamed = TabName + i;
                        }
                        tb.TabName = renamed;

                        _statuses.AddTab(tb);
                        AddNewTab(tb, startup: false);

                        var tabPage = ListTab.TabPages[ListTab.TabPages.Count - 1];
                        listView = (DetailsListView)tabPage.Tag;
                        ListTab.SelectedIndex = ListTab.TabPages.Count - 1;
                    }
                }
                else
                {
                    string renamed = tb.TabName;
                    for (int i = 1; i < int.MaxValue; i++)
                    {
                        if (!_statuses.ContainsTab(renamed)) break;
                        renamed = tb.TabName + "(" + i + ")";
                    }
                    tb.TabName = renamed;

                    _statuses.AddTab(tb);
                    AddNewTab(tb, startup: false);

                    var tabPage = ListTab.TabPages[ListTab.TabPages.Count - 1];
                    listView = (DetailsListView)tabPage.Tag;
                    ListTab.SelectedIndex = ListTab.TabPages.Count - 1;
                }
                SaveConfigsTabs();

                if (listView != null)
                {
                    using (ControlTransaction.Update(listView))
                    {
                        listView.VirtualListSize = tb.AllCount;
                    }
                }
            }
        }