More hovertemplates!

[etpinard]

checking out a few boxes off #3437

cc @plotly/plotly_js @nicolaskruchten I'll push a commit for hovertemplate + parcats at some point next week. I might even try adding support for hovertemplate for a few traces before 1.45.0 is ready.

[nicolaskruchten]

Awesome! These are the missing few for px :D

[etpinard]

I put parcats + hovertemplate on hold until #3437 (comment) is resolved:

Hmm well, I guess for parcats we could use the line container and then maybe coerce a hovertemplate inside each dimensions item? Or maybe have the root hovertemplate apply to all the dimensions/nodes and be ignored when hovering on links?

but now heatmap, contour, histogram2d, histogram2dcontour and scattercarpet have support for hovertemplate.

[etpinard]

parcats has now hover-template support, making this thing status: reviewable.

@antoinerg would you mind reviewing this one?

[antoinerg]

Thank you @etpinard for adding support for hovertemplate to that many traces 💪 . The addition of arrayOk to hovertemplate is also very welcome 🔥

In summary, this PR adds support to the following traces:

• cone (with new test)
• contour (with new test)
• heatmap (with new test)
• histogram (with new test)
• histogram2d (with new test)
• histogram2dcontour (with new test)
• isosurface (with new test)
• mesh3d (with new test)
• parcats (with new test)
• scatter3d (with new test)
• scattercarpet (with new test)
• splom (with new test)
• streamtube (with new test)
• surface (with new test)

We don't have hovertemplate tests for every single trace but that was probably overkill anyway since most of them reuse the same code pathway.

I say this is ready to 💃

[etpinard]

We don't have hovertemplate tests for every single trac

Yes I think we do, at least I tried. See the hover_label_test.js and gl3d_plot_interact.js suites.

[antoinerg]

@etpinard I confirm that you added tests to all the traces for which hovertemplate support was added in this PR! Amazing 😄

💃