Toolbar icons disappeared

[scimax]

Hello everyone,
I'm sorry to ask this as I thought this was already an issue a few weeks ago. But I looked through all the issues and couldn't find it. So maybe I was wrong or I was not searching properly. Sorry for the inconvenience.

Describe the issue

The toolbar icons have disappeared. This happened already a while ago after I reinstalled ipympl. So I thought it was just a bug in the version I updated to. But I updated ipympl and jupyter-matplotlib yesterday and still have no icons. Do you have any idea what I did wrong? The icons are the same as in the ipywidgets set, isn't it?

I have attached a screenshot at the bottom. All the buttons work just fine (also the tooltips), so it's just about the GUI.

Thanks for you help!

Versions

Output of

python -c "import sys; print('\n',sys.version); import ipympl; print('ipympl version:', ipympl.__version__)" ; jupyter --version ; jupyter nbextension list ; jupyter labextension list

 3.6.10 (default, Mar  5 2020, 10:17:47) [MSC v.1900 64 bit (AMD64)]
ipympl version: 0.5.8
jupyter core     : 4.6.3
jupyter-notebook : 6.1.4
qtconsole        : not installed
ipython          : 7.16.1
ipykernel        : 5.3.4
jupyter client   : 6.1.7
jupyter lab      : 2.2.2
nbconvert        : 6.0.7
ipywidgets       : 7.5.1
nbformat         : 5.0.7
traitlets        : 4.3.3
Known nbextensions:
  config dir: C:\Users\maxke\.jupyter\nbconfig
    notebook section
      jupyter-js-widgets/extension enabled
      - Validating: ok
      nbextensions_configurator/config_menu/main enabled
      - Validating: problems found:
        - require?  X nbextensions_configurator/config_menu/main
      contrib_nbextensions_help_item/main enabled
      - Validating: ok
      codefolding/main enabled
      - Validating: ok
      python-markdown/main enabled
      - Validating: ok
      hinterland/hinterland enabled
      - Validating: ok
      hide_input/main enabled
      - Validating: ok
      snippets/main enabled
      - Validating: ok
      code_prettify/2to3 disabled
    tree section
      nbextensions_configurator/tree_tab/main enabled
      - Validating: problems found:
        - require?  X nbextensions_configurator/tree_tab/main
    edit section
      codefolding/edit enabled
      - Validating: ok
  config dir: C:\Users\maxke\.conda\envs\jlab\etc\jupyter\nbconfig
    notebook section
      jupyter-matplotlib/extension enabled
      - Validating: ok
      nbdime/index disabled
      jupyter-js-widgets/extension enabled
      - Validating: ok
JupyterLab v2.2.2
Known labextensions:
   app dir: C:\Users\maxke\.conda\envs\jlab\share\jupyter\lab
        @jupyter-widgets/jupyterlab-manager v2.0.0 enabled  ok
        @jupyterlab/debugger v0.2.0 enabled  ok
        @jupyterlab/toc v4.0.0 enabled  ok
        @krassowski/jupyterlab_go_to_definition v1.0.0 enabled  ok
        @lckr/jupyterlab_variableinspector v0.5.1 enabled  ok
        jupyter-matplotlib v0.7.4 enabled  ok
        nbdime-jupyterlab v2.0.0 enabled  ok
        spreadsheet-editor v0.4.0 enabled  ok

Reproduce

plt.figure()
plt.plot(np.linspace(0,1, 100), np.random.rand(100))

[ianhi]

This looks the same as #238 so I would've thought this would be fixed 🤔 .

Are you working offline? If so maybe it's related to jupyter-widgets/ipywidgets#2997

[scimax]

Thank you very much, this is the issue I meant. But I still couldn't fix it. So, first, I cleaned up my configurations, it was a little bit cluttered. But more important, I tried to look into the CSS changes in #245. They are all set. When I inspect the DOM elements the CSS settings are as expected. Also the icon style contains the "fa-fw" tag as supposed by the javascript changes.

How can I check the version of @jupyter-widgets/base as mentioned in #246 ? It's not clear to me where to look for it?

Oh, I forgot to menion, I'm not working offline.

[scimax]

After browsing through other issues, docs and browser output, can my problem be related to jupyter-widgets/ipywidgets#2989? I also get this message on the javascript console.

vendors~main.4da238e0c0b51cf48011.js:2 Error: widget model not found
    at x.get_model (vendors~main.4da238e0c0b51cf48011.js:2)
    at h.renderModel (vendors~main.4da238e0c0b51cf48011.js:2)
renderModel @ vendors~main.4da238e0c0b51cf48011.js:2

I also looked into these code sections. But I can't identify anything related to Font-Awesome.

[scimax]

Ok, it's clearly a wrong font-family setting to font-awesome. After changing the css style in the browser developer tools as shown in jupyter-widgets/ipywidgets#3000, the icons are back. But it's only a temporary fix as long as I keep jupyterlab instance open.

[martinRenou]

I've been working on a similar issue in another repo. Setting the font-family to "FontAwesome, Font Awesome 5 Free" seems to fix it, it will pick the right font in Jupyter Notebook (FA4) and JupyterLab (FA5). Let's keep this issue open until fixed :)

It is odd I cannot reproduce the issue you see on ipympl though. But I could reproduce it on another project.

[scimax]

Sorry for closing. Yes, I also found it strange that it worked after I set up a new environment, but with identical packages. Maybe I have to look if there is a difference in the packages although it is supposed to be identical.

Interesting:
I looked at a notebook in jupyterlab launched from conda env 2. The icons were there. When I changed the kernel to the conda env 1 the icons were still there after rerunning the whole notebook. Then I launched jupyterlab from conda env 1 and the icon disappeared.