selectedData not populated when graph with selection loads

Bắt đầu bằng cách chạy ví dụ Python được cung cấp với dcc.Graph, một hình chữ nhật Plotly được chọn trước và callback selectedData để tái hiện giá trị ban đầu bị thiếu. Theo dõi đường đi của sự kiện selectedData được sử dụng khi biểu đồ tải, sau đó xác minh rằng callback nhận được lựa chọn đã tồn tại mà không yêu cầu người dùng di chuyển nó.

Describe your context
Please provide us your environment, so we can easily reproduce the issue.

• replace the result of pip list | grep dash below

Package              Version                   Location
-------------------- ------------------------- --------------------------------------------------------------------
anyio                3.5.0
appdirs              1.4.4
appnope              0.1.3
argon2-cffi          21.3.0
argon2-cffi-bindings 21.2.0
asttokens            2.0.5
attrs                21.4.0
Babel                2.9.1
backcall             0.2.0
backports.tempfile   1.0
backports.weakref    1.0.post1
beautifulsoup4       4.10.0
black                22.3.0
bleach               4.1.0
Brotli               1.0.9
certifi              2021.10.8
cffi                 1.15.0
cfgv                 3.3.1
charset-normalizer   2.0.12
click                8.1.2
click-plugins        1.1.1
cligj                0.7.2
colorcet             3.0.0
coverage             4.3.1
dash                 2.6.0
dash-core-components 2.0.0
dash-html-components 2.0.0
dash-table           5.0.0
debugpy              1.6.0
decorator            5.1.1
defusedxml           0.7.1
distlib              0.3.4
entrypoints          0.4
executing            0.8.3
fastjsonschema       2.15.3
filelock             3.6.0
Fiona                1.8.21
Flask                2.1.3
Flask-Compress       1.12
geopandas            0.10.2
identify             2.4.12
idna                 3.3
importlib-metadata   4.11.3
inflect              5.4.0
ipykernel            6.12.1
ipython              8.2.0
ipython-genutils     0.2.0
ipywidgets           7.7.0
itsdangerous         2.1.2
jedi                 0.18.1
Jinja2               3.1.1
json5                0.9.6
jsonschema           4.4.0
jupyter              1.0.0
jupyter-client       7.2.1
jupyter-console      6.4.3
jupyter-core         4.9.2
jupyter-server       1.16.0
jupyterlab           3.3.2
jupyterlab-pygments  0.1.2
jupyterlab-server    2.12.0
jupyterlab-widgets   1.1.0
jupytext             1.13.7
markdown-it-py       1.1.0
MarkupSafe           2.1.1
matplotlib-inline    0.1.3
mdit-py-plugins      0.3.0
mistune              0.8.4
mock                 2.0.0
more-itertools       8.12.0
munch                2.5.0
mypy-extensions      0.4.3
nbclassic            0.3.7
nbclient             0.5.13
nbconvert            6.4.5
nbformat             5.3.0
nest-asyncio         1.5.5
nodeenv              1.6.0
notebook             6.4.10
notebook-shim        0.1.0
numpy                1.22.3
packaging            21.3
pandas               1.4.2
pandocfilters        1.5.0
param                1.12.1
parso                0.8.3
pathspec             0.9.0
pbr                  5.8.1
pexpect              4.8.0
pickleshare          0.7.5
Pillow               9.1.0
pip                  21.2.4
platformdirs         2.5.1
plotly               (built from latest Plotly.js)
pluggy               0.6.0
pre-commit           2.18.1
prometheus-client    0.13.1
prompt-toolkit       3.0.28
psutil               5.9.0
ptyprocess           0.7.0
pure-eval            0.2.2
py                   1.11.0
pycparser            2.21
pyct                 0.4.8
Pygments             2.11.2
pyparsing            3.0.7
pyproj               3.3.0
pyrsistent           0.18.1
pyshp                2.2.0
pytest               3.5.1
python-dateutil      2.8.2
pytz                 2022.1
PyYAML               6.0
pyzmq                22.3.0
qtconsole            5.3.0
QtPy                 2.0.1
regex                2022.3.15
requests             2.27.1
scipy                1.8.0
Send2Trash           1.8.0
setuptools           58.0.4
Shapely              1.8.1.post1
six                  1.16.0
sniffio              1.2.0
soupsieve            2.3.1
stack-data           0.2.0
tenacity             8.0.1
terminado            0.13.3
testpath             0.6.0
toml                 0.10.2
tomli                2.0.1
tornado              6.1
traitlets            5.1.1
typed-ast            1.5.2
typing_extensions    4.1.1
urllib3              1.26.9
virtualenv           20.14.0
wcwidth              0.2.5
webencodings         0.5.1
websocket-client     1.3.2
Werkzeug             2.1.2
wheel                0.37.1
widgetsnbextension   3.6.0
xarray               2022.3.0
zipp                 3.7.0

Describe the bug

When creating a graph that has a selection pre-selected, this isn't shown in selectedData when the graph loads. The user needs to move or alter the selection for something to populate in selectedData

Expected behavior

selectedData would show

Screenshots
Graph on load:

After moving the selection:

Example code:

import json

from dash import Dash, dcc, html
from dash.dependencies import Input, Output
import plotly.express as px

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = Dash(__name__, external_stylesheets=external_stylesheets)

styles = {
    'pre': {
        'border': 'thin lightgrey solid',
        'overflowX': 'scroll'
    }
}

df = px.data.iris()
fig = px.scatter(df, x="sepal_width", y="sepal_length", color='petal_length')

fig.add_selection(type="rect",
    x0=3.0, y0=6.5, x1=3.5, y1=5.5,
    line=dict(
        color="Crimson",
        width=2,
        dash="dash",
    ))

fig.update_layout(dragmode='select',
                  newselection=dict(line=dict(color='blue')))

app.layout = html.Div([
    dcc.Graph(
        id='basic-interactions-3',
        figure=fig
    ),

        html.Div([
            dcc.Markdown("""
                **Selection Data**

            """),
            html.Pre(id='selected-data-3', style=styles['pre']),
        ]),

])


@app.callback(
    Output('selected-data-3', 'children'),
    Input('basic-interactions-3', 'selectedData'))
def display_selected_data(selectedData):
    return json.dumps(selectedData, indent=2)


if __name__ == '__main__':
    app.run_server(debug=True)

@archmoj