Add instruction to restart jupyterlab

[orena1]

All of those are because they did not restart JupyterLab
#275
#148
#66
#201

Happen to me also, might even make people go back to notebook

[jasongrout]

After rebuilding, you should just need to refresh your browser. Restarting forces a refresh, so that works too.

[orena1]

I tried refreshing a couple of times, it did not work. I still got:
Canvas(toolbar=Toolbar(toolitems=[('Home', 'Reset original view', 'home', 'home'), ('Back', 'Back to previous

[jasongrout]

I tried refreshing a couple of times, it did not work. I still got:

But restarting did work? That output indicates @jupyter-widgets/jupyterlab-manager is not installed/built.

[orena1]

Yes, restart did work.
It is not that it completely did not work completely before restart. If I would do display(fig) it worked, but just not automatically for each figure that I created.
For example something like this:

# Testing matplotlib interactions with a simple plot
figure()
imshow(mov0[50])
figure()
imshow(mov1[50])
figure()
imshow(mov2[50])

did not work before I restarted.

[jasongrout]

Ah, I'm also presuming that you restarted your kernel after installing the python package. A restart would also force that.

[orena1]

I tried both kernel restart and browser refresh and it did not work.
Only when I restarted JupyterLab it started to work correctly.
This is also the advise that solved it for these ticket:
#275 (comment)
#148 (comment)

Thanks

[jasongrout]

As far as I'm aware, a complete server restart shouldn't be necessary in general, thought it certainly is sufficient. Maybe there is something more tricky with how things work with ipympl. Anyways, I'm glad you are contributing back what worked for you, and it's up to the maintainers here to review/decide.

[SylvainCorlay]

Should we close this ?

[martinRenou]

👍🏽