Make attribution control responsive.

[lennerd]

This PR adds responsiveness to AttributionControl by adding a compact version. This is very similar to the mapbox.js API and can also be activated by passing compact: true as an option to the AttributionControl.

var map = new mapboxgl.Map({ attributionControl: false })
    .addControl(new mapboxgl.AttributionControl({
        compact: true
    }));

Fixes: #3284

• briefly describe the changes in this PR
• manually test the debug page
• gather feedback for the given changes
• write tests for all new functionalities
• document any changes to public APIs

Happy to hear your feedback.

[lennerd]

#3284 (comment):

@lennerd a PR would be very welcome! The label just means that an equivalent functionality is already there in Mapbox GL Native, and we just need to match it in GL JS.

Is this meant to match feature- or also layout-wise?

[mollymerp]

Thank you for this PR @lennerd!! It is working as expected when I run it locally.

cc @tristen for design 👀

[lennerd]

Any more feedback? Otherwise I would work on some simple tests, add some documentation and rebase the PR.

[tristen]

@lennerd Design wise this looks great!

simple tests, add some documentation and rebase the PR.

👍

[lennerd]

Docs now reflect the new attribution control option, tests are running smoothly, PR is rebased.

Anything more I can do?

[lucaswoj]

Tests passing locally 🚢