`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 中以及作为 Python 脚本运行提供的 FigureWidget 示例，重点关注图形的 on_selection 回调和 dragmode="select" 设置。跟踪选择事件路径，并将行为与链接的 selection-events 文档和 issue #2698 进行比较；完成的标准是解释清楚回调行为，并修复报告中的示例，或明确确定其受支持的用法。