Starting testing latest ipywidgets + remove `<8` pin

[ianhi]

Should fix #460

[github-actions[bot]]

:point_left: Launch a binder notebook on branch ianhi/ipympl/widgets8

[ianhi]

@martinRenou I consolidated a lot of the tests because we were spending a lot of time waiting for conda envs to install so i figured we could save on that by just having build and test steps. Is there a reason that we should instead keep the separate?

[martinRenou]

Is there a reason that we should instead keep the separate?

The idea behind this is to test the generated wheel while running the tests. Though I am not strongly against getting rid of it.

[ianhi]

Is there a reason that we should instead keep the separate?

The idea behind this is to test the generated wheel while running the tests. Though I am not strongly against getting rid of it.

I think that that behavior was is maintained here - we still have a separate build and test step. I meant that the pytest tests and the visual regression tests were split into different steps which resulted in extra full installs

[ianhi]

notes for myself:

Check out the matrix of jupyterlab dependencies. Part of the issue may be due to this:

          - python: '3.6'
            dist: 'ipympl*.tar.gz'
            jlab_version: 3
          - python: '3.9'
            dist: 'ipympl*.whl'
            jlab_version: 2.3.2

there's also this warning: LOG Run-time JupyterLab version (3.3.4) is different than testing framework is built for (3.0.11). This could cause issues in testing.

[martinRenou]

We need to update Galata quite a bit probably. I'll do this in this PR if it does not pass the tests.

[martinRenou]

The failing tests are the ones against Matplotlib's main branch, so we can ignore them for now and fix those later.

[martinRenou]

Please update galata references

[martinRenou]

Bot running in https://github.com/matplotlib/ipympl/actions/runs/2902499214

[martinRenou]

I removed the JupyterLab 2 CI test, as it's quite old anyway now and it reduces our build matrix.

As said above, the tests against latest Matplotlib are failing, let's ignore those for now.

Merging!

[ianhi]

thank you martin!