System.Waf.Applications.RecentFileList.RecentFilePropertyChanged C# (CSharp) Method

        private void RecentFilePropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == nameof(RecentFile.IsPinned))
            {
                RecentFile recentFile = (RecentFile)sender;
                int oldIndex = recentFiles.IndexOf(recentFile);
                if (recentFile.IsPinned)
                {
                    recentFiles.Move(oldIndex, 0);
                }
                else
                {
                    int newIndex = PinCount;
                    if (oldIndex != newIndex)
                    {
                        recentFiles.Move(oldIndex, newIndex);
                    }
                }
            }
        }
    }