WIP: bounds across the antimeridian

[tobrun]

This PR is more a question/discussion than an actual fix, it attempts to fix the issue from #13672:

This issue is that I'm unable to define a crossing antimerdian bounds that plays well with Transform::setLatLngBounds. After briefly looking into the possibilities, I believe that creating such
bounds, with constructor Bounds(sw, ne), can in theory be done with:

• Bounds(LatLng(-20;-170), LatLng(20;170)) // by switching the sw/ne order
• Bounds(LatLng(-20;170), LatLng(20;190)) // going over max longitude = crosses IDL

The former approach is taken with gl-js as shown here but not possible on gl-native as this generates an invalid bounds by definition here (though this could be changed?).

For now, this has led me down the road to try optimizing for the latter case in this PR.

---

Current state of this PR works well for my specific setup:

But I'm very sure that this line will impact other parts of the code and thus not a correct change.

Would someone be able to 👀 this and provide some feedback/context?

cc @ansis @ryanhamley @brunoabinader @tmpsantos

[tmpsantos]

The former approach is taken with gl-js as shown here but not possible on gl-native as this generates an invalid bounds by definition here (though this could be changed?).

I'm not so sure that this will generate invalid bounds. Perhaps the issue is we are always creating Bounds with Wrapped coordinates.

https://github.com/mapbox/mapbox-gl-native/blob/master/include/mbgl/util/geo.hpp#L32

[tobrun]

For both suggested cases from OP the bounds aren't being wrapped:

note that latter returns false for crossesAntimeridian while the former doesn't

[brunoabinader]

Fixed in #13958.