[ Question] Update treedata by myself Move and Delete methods, but something wrong when Tree shown #2514

import PySimpleGUI as sg


class Tree_Data(sg.TreeData):

    def __init__(self):
        super().__init__()

    def move(self, key1, key2):
        if key1 == '':
            return False
        node = self.tree_dict[key1]
        parent1_node = self.tree_dict[node.parent]
        parent1_node.children.remove(node)
        parent2_node = self.tree_dict[key2]
        parent2_node.children.append(node)
        return True

    def delete(self, key):
        if key == '':
            return False
        node = self.tree_dict[key]
        key_list = [key, ]
        parent_node = self.tree_dict[node.parent]
        parent_node.children.remove(node)
        while key_list != []:
            temp = []
            for item in key_list:
                temp += self.tree_dict[item].children
                del self.tree_dict[item]
            key_list = temp
        return True


def Button(Key):

    return sg.Button(button_text=Key, target=Key, enable_events=True,
                     file_types=(('All Python files', '*.py')),
                     size=(10,1), font=Font)


def Text(Key):

    return sg.Text('', size=(50,1), auto_size_text=False, font=Font, key=Key)


def Tree(treedata):

    return sg.Tree(
        data=treedata,
        headings=['Notes',],
        visible_column_map=[False,],
        col0_width=50,
        auto_size_columns=False,
        select_mode=sg.TABLE_SELECT_MODE_BROWSE,
        show_expanded=False,
        enable_events=False,
        font=Font,
        num_rows=25,
        row_height=32,
        pad=(0, 0),
        key='Tree',
        right_click_menu=['Right',['Rename', 'Move', 'Delete']])


Font = 'Courier 20'

treedata = Tree_Data()
treedata.Insert('', 'List1', 'List1', values=[])
treedata.Insert('', 'List2', 'List2', values=[])
treedata.Insert('', 'List3', 'List3', values=[])
treedata.Insert('List1', 'Book1', 'Book1', values=[])
treedata.Insert('List1', 'Book2', 'Book2', values=[])
treedata.Insert('List2', 'Book3', 'Book3', values=[])
treedata.Insert('List2', 'Book4', 'Book4', values=[])

Layout = [[Button('Update'), Button('Quit')],
          [Tree(treedata),Text('Text')]]

Window = sg.Window('Python Book', layout=Layout, font=Font, finalize=True)

Window['Tree'].Widget.configure(show='tree')

print('Original treedata:\n',treedata)

while True:

    Event, Values = Window.read()

    if Event == None or Event == 'Quit':
        break

    elif Event == 'Update':
        result1 = treedata.delete('Book2')
        print('Result of Delete: ', result1)
        result2 = treedata.move('List2', 'Book1')
        print('Result of Move: ', result2)
        print('New treedata:\n',treedata)
        Window['Tree'].Update(values=treedata)
        Window.Refresh()

Window.close()

Original treedata:
  : root
    List1 : List1
        Book1 : Book1
        Book2 : Book2
    List2 : List2
        Book3 : Book3
        Book4 : Book4
    List3 : List3

Result of Delete:  True
Result of Move:  True

New treedata:
  : root
    List1 : List1
        Book1 : Book1
            List2 : List2
                Book3 : Book3
                Book4 : Book4
    List3 : List3