`on_selection` callback seems to not get fired

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It seems the on_selection callback does not fire anymore. I've seen a number of open and closed issues back from 2020 discussing the usage of it, but based on the newest version 5.10.0 I cannot get anything to fire on a selection.

The simplest code example I could find (from https://github.com/plotly/plotly.py/issues/2698)

import plotly.graph_objects as go
import numpy as np

np.random.seed(1)
x = np.random.randn(500)

def on_selection_print(obj, points, selector):
    print(points.point_inds)

figure_widget = go.FigureWidget(data=[go.Histogram(x=x)])
figure_widget.update_layout(dragmode="select")    
figure_widget.data[0].on_selection(on_selection_print)
figure_widget.show()

Both running this in jupyter or as a python script, nothing seems to print.

I tried the latest docs on selection events but I couldn't actually get that example to run in jupyter or otherwise.

Am I just missing something simple?

Thanks!

首先在 Jupyter 中以及以 Python 指令碼的形式執行提供的 FigureWidget 範例，重點關注圖形的 on_selection 回呼和 dragmode="select" 設定。追蹤選取事件路徑，並將行為與連結的 selection-events 文件和 issue #2698 進行比較；完成的標準是說明清楚回呼行為，並修正回報的範例，或明確確立其受支援的使用方式。