map.fitBounds does not animate

[jfrankl]

mapbox-gl-js version: 1.2.0+

browser: Chrome 78.0.3904.97

Steps to Trigger Behavior

1. Use fitBounds on any Mapbox GL JS project (example: run map.fitBounds([[-133, 16], [-68, 50]])) using version 1.2.0 or later

Link to Demonstration

Mapbox GL JS 1.1.0 (animation when you click "Test fitBounds" button): https://jsfiddle.net/hdwjby38/14/
Mapbox GL JS 1.2.0 (no animation when you click "Test fitBounds" button): https://jsfiddle.net/3svo9Lmf/7/

Expected Behavior

In earlier versions of Mapbox GL JS, running fitBounds would animate to the new location.

Actual Behavior

It appears that as of 1.2.0, the camera no longer animates. I could not find any mention of a change in the release notes, so I am assuming this is a bug. Setting an option like duration: 1000 seems to have no effect. I tested on 1.5.0 and it has the same issue.

[ryanhamley]

The flyTo animations work as expected for me in both examples. You most likely have your computer or browser set to reduce motion which is now detected by prefers-reduced-motion starting in 1.2.0

[jfrankl]

@ryanhamley that's definitely it. Thank you.