Closed
Description
since this was added:
https://github.com/jupyter-widgets/ipywidgets/blob/master/ipywidgets/widgets/widget_button.py#L65-L73
we are no longer able to pass in additional fa classes to specify fa-spin or fa-lg etc.
I really liked my spinning gear icon button before this change...
i.e.
from ipywidgets import Button
Button(description='Running...', icon='fa-gear fa-spin fa-lg')
it will error on the add of the DOMTokenList due to the spaces in the string
https://github.com/jupyter-widgets/ipywidgets/blob/master/packages/controls/src/widget_button.ts#L91