That'd be most powerful as a learning tool (and a sweet "oh wow!" demo).

However, just a GitHub-style +/- diff view on the OpenSCAD files next to the STL diff view would be awesome (basically like the GitHub commit-range/pull-request "files" view, but with STL support).

Yes, I agree. I'll have to find space to fit it, but it makes sense to do so.

> Do you mean OpenSCAD and STL diffs side by side, and live edited, so when you change the code, you see the model change?

Well, there's always openjscad. I don't think it was a direct port, though.

Yup, OpenJsCad has the ability to do live editing, but it tends to render a bit slow when the models are somewhat more complex. It sends work back and forth to a background worker to generate the polygons, but it still has to send it all back to the main thread.

Unfortunately, OpenJsCad doesn't seem to have a high rate of adoption among 3D printing modelers...at least not yet.