Fix URL path for output renderer scripts

[jonah-iden]

What it does

Fixes #12966
Fixes an issue with notebook api downloading output renderer scripts from base path instead of deployed path

How to test

Easiest for me was using nginx.

1. run Theia locally
2. Add following config to the server configuration of nginx

location /theia/ {
            rewrite ^/theia(/.*)$ $1 break;
            proxy_pass http://localhost:3000/;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

3. open theia on http://localhost/theia
4. open a notebook, execute a cell and see the output renderer works.

Follow-ups

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[bvenreply]

Hello @jonah-iden, we tested this solution but it's not working for us, we're getting this error now:

It seems the browser import function is being finicky about relative module paths. Prefixing a ./ seems to fix it:

[jonah-iden]

Hi, sorry for the late reply.
My solution worked for me and was also used in other parts of theia. Maybe there is a bigger problem in theia then and i did not test thoroughly enough. I'll try to take a look later today.

[bvenreply]

Hi, sorry for the late reply. My solution worked for me and was also used in other parts of theia. Maybe there is a bigger problem in theia then and i did not test thoroughly enough. I'll try to take a look later today.

No problem. Thank you @jonah-iden. Btw another possibility to consider is that I messed something up on my end...

[jonah-iden]

@bvenreply, i was able to reproduce your error and improved my previous solution. For me this works great. could you test it again if you find the time?

[bvenreply]

@jonah-iden I tested the new changes, I confirm it's working. Thanks!

[JonasHelming]

@msujew We discussed yesterday that your approval is enough for this one to be merged

[msujew]

Alright, works well. I'm not 100% sure this is the best approach to this, but it works and we can easily change it in case there are any issues.