nbsphinx compatability with `mathjax3_config['options']['processHtmlClass']` override

[awaelchli]

Describe the bug

Yesterday myst parser updated and now warns:

WARNING: `mathjax3_config['options']['processHtmlClass']` is being overridden by myst-parser to tex2jax_process|mathjax_process|math. Set `myst_mathjax_classes = None` if this is undesirable.

Setting `myst_mathjax_classes = None`` as per instruction does not work, and generates another batch of warnings:

WARNING: The config value `myst_mathjax_classes' has type `NoneType', defaults to `str'.
WARNING: myst configuration invalid: 'mathjax_classes' must be <class 'str'> (got None that is a <class 'NoneType'>).
WARNING: `mathjax3_config['options']['processHtmlClass']` is being overridden by myst-parser to tex2jax_process|mathjax_process|math. Set `myst_mathjax_classes = None` if this is undesirable.

The docs explain something here.
I tried also update_mathjax=False and setting values for myst_mathjax_classes=...

Expected behavior

No warning, or a solution to fix the underlying reason why it gets shown.

Environment

• Python Version [e.g. 3.7.1]: 3.8
• Package versions or output of jupyter-book --version: x
• Operating System: macos

Additional context

It is not possible to downgrade to 0.14.0 or sphinx gets uninstalled. Why?

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[Borda]

I can confirm that it starts with the recent 0.15

[chrisjsewell]

Heya, can you confirm that you do not have any specific configuration for mathjax in your conf.py?

It is not possible to downgrade to 0.14.0 or sphinx gets uninstalled. Why?

It is possible to downgrade; it will also downgrade to sphinx 3, because 0.14 does not support sphinx 4 but should not just uninstall it entirely. If you have any different behaviour, I would raise this with the dependency manager you are using (e.g. pip/conda)

[chrisjsewell]

or perhaps you are using nbsphinx as well, which also overrides this setting? https://github.com/spatialaudio/nbsphinx/blob/4fb55864ab21487363ad9f9eedcff1730a3325ef/src/nbsphinx.py#L1890

[awaelchli]

This is our conf.py: https://github.com/PyTorchLightning/pytorch-lightning/blob/master/docs/source/conf.py
I see it is only listed in the extensions but as far as I can see we have no special settings. I can't say why we have it at this moment but will try to figure it out.

And yes it seems we have nbsphinx too

[chrisjsewell]

And yes it seems we have nbsphinx too

yeh I'll blame that all on nbsphinx then lol, but I'll have a look at making a change to accommodate it

I tried also update_mathjax=False

Note this should be myst_update_mathjax=False, that should work (although maybe not recommended)

[Borda]

yeh I'll blame that all on nbsphinx then lol, but I'll have a look at making a change to accommodate it

so it is about the order as plugins are used?

[awaelchli]

myst_update_mathjax=False worked (I tried previously update_mathjax=False from the docs). I think we should go with this solution vs. downgrading myst-parser. https://github.com/PyTorchLightning/pytorch-lightning/pull/7967/files

[chrisjsewell]

so it is about the order as plugins are used?

No (nbsphinx is after myst-parser in the pytorch extensions), probably the order/priority of events.

Its not really ideal that either package has to override the (global) configuration (there is a long open PR for this sphinx-doc/sphinx#5504), but such is life

Of course, you could always use https://github.com/executablebooks/MyST-NB, which is directly integrated with myst-parser 😉

[awaelchli]

@chrisjsewell this is resolved for us by myst_update_mathjax=False, unless there is something to address on your side we can close it :) thanks for the help