ipywidgets: GridBox doesn't work in cocalc-jupyter.

[williamstein]

1. Paste this into cocalc-jupyter with the python3 kernel:

import ipywidgets as ws
buttons = [ws.Button(description='Button '+str(i)) for i in range(5)]
print('start display')
display(ws.GridBox(buttons))
print('end display')

2. See this:
   

Note in the Javascript console that there is an infinite recursion.

[williamstein]

Note -- this patch doesn't fully implement GridBox -- it just makes it not crash. See #5228