Icons don't show on buttons

[germandb]

trafficstars

Description

When adding an icon to a button, the icon is not rendered.

I checked your code and found that the error is caused by this pice of code

In Font Awesome 5, the “fa” prefix has been deprecated, and the new default style is “fas”, which stands for solid icons.

If I manually change the class the icon is rendered correctly

Reproduce

1. Create a widget button with an icon: btn = w.Button(icon ='camera')
2. Diplay that button: display(btn)
3. See a rectangular image

Expected behavior

Show the specified icon in the button

Context

• ipywidgets version 8.1.1
• Operating System and version: Windows 11
• Browser and version: Edge

If using JupyterLab

• JupyterLab version: IPython : 8.22.2 ipykernel : 6.29.2 ipywidgets : 8.1.1 jupyter_client : 8.6.0 jupyter_core : 5.7.1 jupyter_server : 2.7.3 jupyterlab : 4.1.4 nbclient : 0.8.0 nbconvert : 7.16.2 nbformat : 5.9.2 notebook : 7.1.1 qtconsole : not installed traitlets : 5.14.1

Installed Labextensions

jupyterlab-execute-time v3.1.2 enabled OK (python, jupyterlab_execute_time)
        jupyter-cytoscape v1.3.3 enabled OK
        @jupyter-server/resource-usage v1.0.2 enabled OK (python, jupyter-resource-usage)
        @jupyter-lsp/jupyterlab-lsp v5.1.0 enabled OK (python, jupyterlab-lsp)
        @jupyterlab/mathjax3-extension v4.3.0 enabled  X (python, jupyterlab-mathjax3)
/opt/conda/share/jupyter/labextensions
jupyterlab_pygments v0.2.2 enabled  X (python, jupyterlab_pygments)
orion-custom-theme v0.1.0 enabled OK (python, orion_custom_theme)
ploomber-extension v0.1.0 enabled OK (python, ploomber_extension)
ipyaggrid v0.5.1 enabled OK (python, ipyaggrid)
jupyterlab-plotly v5.18.0 enabled  X
@jupyter-notebook/lab-extension v7.1.1 enabled OK
@jupyterlab-orion/orion-comm v0.1.0 enabled OK (python, jupyterlab_orion_comm)
@jupyter-widgets/jupyterlab-manager v5.0.9 enabled OK (python, jupyterlab_widgets)
The following extensions are outdated:
@jupyterlab/mathjax3-extension
jupyterlab_pygments
jupyterlab-plotly
Consider checking if an update is available for these packages.
Disabled extensions:
@jupyterlab/apputils-extension:announcements
@jupyterlab/completer-extension:base-service
@jupyterlab/fileeditor-extension:language-server
@jupyterlab/lsp-extension:settings
@jupyterlab/notebook-extension:language-server