Unexpected behavior using ipympl called from sympy_plot_backends, same code works as expected using pyodide kernel

[felixlen]

Description

With sympy_plot_backends I create an interactive plot that shows the graph of a parameter dependent function. With a slider it is possible to change the parameter value. After changing the slider value, the plot should be updated. In sympy_plot_backends interactive matplotlib is used.

With pyodide-kernel for jupyterlite this feature is working as expected. With xeus-python there is a glitch: After changing the slider value, the graph is not directly updated. As soon as I click into the drawing pane, the graph gets updated.

Reproduce

Execute the following code in a notebook:

import sympy
%matplotlib widget
import spb

x = sympy.Symbol('x', real=True)
a = sympy.Symbol('a', real=True)

f = sympy.cos(x)/(x**2 + 1)

spb.plot(
    f.subs(x, x-a),
    params = {
        a: (0, -5, 5)
    }
)

• Now change the slider value for a from the default 0.0 to something nonzero.
• Observe that the plot does not change.
• Click into the plot.
• Observe that now the plot has been updated as expected.

Expected behavior

The plot should update without clicking into the plot pane. With pyodide kernel it is working as expected.

Context

Xeus Python Environment file:

name: xeus-python-kernel

channels:
  - https://repo.mamba.pm/emscripten-forge
  - conda-forge

dependencies:
  - ipympl
  - matplotlib
  - numpy
  - sympy
  - sympy_plot_backends

• JupyterLite version: 0.2.1
• Operating System and version: OS X
• Browser and version: Chrome 120.0.6099.71 and Safari 17.2 (19617.1.17.11.9)