public static IEnumerable <string> CollectTabs(this EditorResult editorResult)
        {
            var set = new HashSet <ShapePosition>();

            foreach (var editor in editorResult.Editors)
            {
                var positionText = editor.Metadata.Position;

                if (!String.IsNullOrWhiteSpace(positionText))
                {
                    var position = ShapePosition.Parse(positionText);
                    set.Add(position);
                }
            }
            return(set.Distinct(new ShapePositionDistinctComparer()).OrderBy(x => x.Position).Select(x => x.Name));
        }