Docdiff: showing mathjax that didn't change as changes

[sciencewhiz]

My project uses sphinx.ext.mathjax. When there is no change in content, docdiff still shows a change. The docdiff appears to be comparing the unrendered mathjax in the old version to the rendered output.

Here's a link to the PR build that shows this: https://frc-docs--2785.org.readthedocs.build/en/2785/docs/software/advanced-controls/state-space/state-space-flywheel-walkthrough.html

[humitos]

The docdiff appears to be comparing the unrendered mathjax in the old version to the rendered output.

I think this is the problem, yeah. We load the DOM of the original file without processing it (no JS ran over it). However, the current DOM is loaded after running all the scripts.

I think we should be able to load the current DOM before performing any JS operations.