enable assignment of "Download plot as a png" value to variable

Bug (or Feature Request?):

I want to get the annotated image after I used drawrect. The only possible way, for now, is using the Download plot as a png button, save it on pc, read it. Is there a straightforward way to do that?

I mark it as a bug (or maybe it's the intended behavior by the developer) because fig.to_image(format="png", engine="kaleido") return the original image, not the annotated one.

Note: I'm using a jupyter notebook

import plotly.graph_objects as go
fig = go.Figure(data=go.Bar(y=[2, 3, 1]))
config = dict({    
    'modeBarButtonsToAdd':[
        'drawrect',
        'eraseshape',
    ],
    'modeBarButtonsToRemove':[
        'toggleSpikelines','hoverCompareCartesian'
    ]
})
fig.show(config=config)

do some annotations...

then run:

import numpy as np
import cv2
import matplotlib.pyplot as plt
annotate_image = fig.to_image(format="png", engine="kaleido")
nparr = np.frombuffer(annotate_image, np.uint8)
img_numpy = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
plt.imshow(img_numpy[...,::-1])

The plt.imshow(img_numpy[...,::-1]) will show the original image, not the annotated image. How to use fig.to_image(format="png", engine="kaleido") to include the annotation of drawrect? Or any workaourd?

エントリーポイント fig.show(config=config) と drawrect インタラクションから始め、その後 fig.to_image(format="png", engine="kaleido") と比較します。注釈付きの状態を既存のエクスポートパス経由で渡せるかどうかを確認します。描画した長方形が結果として割り当てられた画像に含まれていれば完了です。Issue ではリポジトリのファイルやテストは指定されていません。