Failed to execute 'drawImage' on 'CanvasRenderingContext2D' when Canvas instance is embedded in the ipywidgets layout

从提供的最小示例开始，该示例在 ipywidgets AppLayout 中使用 ipympl 的 backend_nbagg Canvas，并在 Chrome 中复现损坏图像错误。比较版本 0.7.0 与更新版本之间的行为；当绘图在嵌入式 canvas 中渲染且没有 drawImage 异常时，即表示完成。

For my project, it is required to embed Canvas from the ipympl backend in the ipywidgets Layout or AppLayout.
It worked perfectly with version 0.7.0, but with all newer versions the plot image is not rendered in the canvas with exception in Crome browser: Error setting state: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The HTMLImageElement provided is in the 'broken' state.

The minimum example:

import numpy as np
from matplotlib.figure import Figure
from ipympl.backend_nbagg import Canvas as Canvas, FigureManager

class PlotWidget(Canvas):
    
    __num__ = 0
    
    def __init__(self, **kwargs):
        Canvas.__init__(self, Figure(dpi=100, figsize=(6, 5.5)))
        self.resizable = False
        self.header_visible=False
        
        fig = self.figure
        ax = fig.add_subplot(1, 1, 1)
        self.lines, = ax.plot(np.linspace(0, 1, 100), np.linspace(0, 1, 100), 'o-', markersize=2, linewidth=2)
        
        manager = FigureManager(self, self.__num__)
        self.__num__+=1
        self.draw()
    
import ipywidgets.widgets as widgets
from ipywidgets import AppLayout, Layout

class Layout(AppLayout):
    
    def __init__(self, **kwargs):
        AppLayout.__init__(self, **kwargs)
        self.center = PlotWidget(**kwargs)
        if "pane_widths" not in kwargs: 
            self.pane_widths = [1, '650px', '0px']
        if "pane_heights" not in kwargs: 
            self.pane_heights = ['0px', '300px', '0px']

app = Layout()
display(app)