jacebrowning / doorstop

                    result.session_selected_link = frozenset([x for x in result.session_selected_link if str(x) not in [str(y) for y in item_link]])

                    count_after = len(new_item.links)

                    if count_before != count_after:

                        result.session_pending_change = True

        elif isinstance(action, Action_ChangeItemAddLink):

            new_link = action.new_link

            if "" != new_link:

                project_tree = state.project_tree

                old_item = project_tree.find_item(action.item_uid) if project_tree else None

                if old_item:

                    if new_link not in old_item.links:

                        result = copy.deepcopy(result)

                        project_tree = result.project_tree

                        if project_tree:

                            new_item = project_tree.find_item(action.item_uid)

                            links = new_item.links

                            links.append(UID(new_link))

                            new_item.links = links

                            result.session_pending_change = True

        return result

class Reducer_Edit(Reducer):

    def reduce(self, state: State, action: Action) -> State:

        result = state

        if isinstance(action, Action_ChangeItemText):

            project_tree = state.project_tree

            old_item = project_tree.find_item(action.item_uid) if project_tree else None

            if old_item:

                old_item_text = old_item.text

                new_item_text = action.item_new_text

                if old_item_text != new_item_text:

                    result = copy.deepcopy(result)

                    project_tree = result.project_tree

                    if project_tree:

                        new_item = project_tree.find_item(action.item_uid)

                        new_item.text = new_item_text

                        result.session_pending_change = True