[BUG] [WebGL] Blank figures in Jupyter Lab Desktop about bokeh HOT 5 CLOSED

@alcrene sure, but there's going to have to be some kind of generic mechanism to catch and surface errors, since individually crafting an error message for every conceivable situation is very far outside the realm of possible (there would be thousands or more). However, AFAIK there is already nominally an issue for that: #6884 though it may need some updating or re-triaging, or maybe a new issue should be opened to replace that discussion issue. cc @mattpap

In any case I will close this one.

from bokeh.

This may be a problem with electoron.js. @alcrene, maybe you could try the suggestion from electron/electron#40684 (comment)?

from bokeh.

That seems to be the case. JLab Desktop uses its own cache folders (~/.Electron doesn’t exist on my machine) , so to be sure I removed everything that had the word “cache” in its config folder:

cd .config/jupyterlab-desktop
mv Cache Code\ Cache DawnCache GPUCache ~/tmp/jlab-caches/

Sure enough, after doing that I could relaunch Jupyter Lab Desktop and the example above worked as expected.

from bokeh.

I'm not sure there is anything we can do on our end apart from maybe a note in the docs

from bokeh.

Something that would have been very helpful when tracking this down would have more information on the figure itself. (It took me a while to think to open the JS console, and I think it’s safe to say most users would never think of that.)
No idea how feasible it is, but I am imagining a message like the following:

An issue occurred while attempting to load WebGL.
Refer to this troubleshooting page for possible fixes: [link to docs]

(Taking care of course that the message would be displayed even after an error in the javascript stack.)

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