BiomePainter.History.HistoryManager.FilterOutType C# (CSharp) Метод

        public void FilterOutType(Type type)
        {
            LinkedList<IAction> newUndo = new LinkedList<IAction>();

            foreach (IAction action in undoStack)
            {
                if (type.Equals(action.GetType()))
                    action.Dispose();
                else
                    newUndo.AddLast(action);
            }

            undoStack = newUndo;

            LinkedList<IAction> newRedo = new LinkedList<IAction>();

            foreach (IAction action in redoStack)
            {
                if (type.Equals(action.GetType()))
                    action.Dispose();
                else
                    newRedo.AddLast(action);
            }

            if (firstBiomeAction != null && type == typeof(BiomeAction))
                firstBiomeAction = null;
            if (firstPopulateAction != null && type == typeof(PopulateAction))
                firstPopulateAction = null;
            if (firstSelectionAction != null && type == typeof(SelectionAction))
                firstSelectionAction = null;

            redoStack = newRedo;
        }