Update Vega-Lite to 5.14.1. Add transform_extent

[binste]

So far there were no changes to Altair necessary apart from rerunning the automatic code generation. For the tests to pass, we need a new version of vl-convert with support for VL 5.14.1. @jonmmease Would that work for you? I think even if a new VL version comes out in the next 1-2 weeks, although I'm not aware of one, we could still stick to VL 5.14.1 for Altair 5.1.

See #3145 (comment) for the related release discussion.

[jonmmease]

Thanks for working on this @binste! Yes, I'll get a vl-convert update out shortly

[jonmmease]

Vega-Lite 5.14.1 added to vl-convert-python in version 0.12.0 (just released)

Update: I restarted the tests to see if that fixes the issue

[jonmmease]

I don't know if it actually introduces any challenges, but the new extent transform is a bit unique in that it's a transform that outputs a param.

From https://vega.github.io/vega-lite/docs/extent.html, it looks like the param is provided as just a string, so I guess that should work fine in Altair as well. It doesn't need to be this PR, but we should make a note that we need to add a new extent transform section to the docs, and it would be good to port over the example from https://vega.github.io/vega-lite/docs/extent.html.

[binste]

Thanks for making a new release of vl-convert and the feedback! Good point about extent, I missed that one when going through the release logs.

I'll add it in this PR in the coming days

• transform_extent method in api.py
• Doc page
• Test in test_transforms
• Add to changes.rst

[binste]

Implemented transform_extent method and added a new page to the documentation.

[binste]

@jonmmease Does VegaFusion support the extent transform? The .transformed_data method worked on the chart example I built in the doc page but as I use the parameter value as single values it does not return it anyway so not sure if that's a good test.

[jonmmease]

Yes, VegaFusion supports extent, so I think we're good there

[binste]

Cool, I'll add the tick in the docs

[jonmmease]

Thanks for pulling all of this together, and adding the new docs for extent. lgtm!

[binste]

Thanks for the review! :)