Camera position for LatLngBounds when crossing IDL

[LukasPaczos]

When using mbgl::Map::cameraForLatLngs(const std::vector<LatLng>& latLngs, const Transform& transform, const EdgeInsets& padding) we are calculating the bounds width without taking IDL into account, or in other words, not by the shortest possible path.

It's reproducible with below Android code:

mapView.getMapAsync(new OnMapReadyCallback() {
  @Override
  public void onMapReady(MapboxMap mapboxMap) {
    mapboxMap.addOnCameraIdleListener(() ->
      Timber.e("Camera IDLE: %s, zoom: %f", mapboxMap.getCameraPosition().target, mapboxMap.getCameraPosition().zoom));

    //crossing IDL
    LatLngBounds latLngBounds = LatLngBounds.from(16.5, -172.8, -35.127709, 172.6);
    CameraPosition cameraPosition = mapboxMap.getCameraForLatLngBounds(latLngBounds, new int[] {0, 0, 0, 0});
    mapboxMap.moveCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));

    //not crossing IDL
    new Handler().postDelayed(() -> {
      LatLngBounds latLngBounds1 = LatLngBounds.from(16.5, -162.8, -35.127709, -177.4);
      CameraPosition cameraPosition1 = mapboxMap.getCameraForLatLngBounds(latLngBounds1, new int[] {0, 0, 0, 0});
      mapboxMap.moveCamera(CameraUpdateFactory.newCameraPosition(cameraPosition1));
    }, 2500);
  }
});

which gives us this results:

Camera IDLE: LatLng [latitude=0.0, longitude=-0.10000000000923137, altitude=0.0], zoom: 0.000000
Camera IDLE: LatLng [latitude=-10.357079043959077, longitude=-170.10000000000286, altitude=0.0], zoom: 2.729140

[LukasPaczos]

Also noticed, that when creating mbgl::LatLngBounds object with mbgl::LatLngBounds::hull, we are always getting a bound that doesn't cross the antimeridian because of the implementation of mbgl::LatLngBounds::extend, unless the values are unwrapped.

[1ec5]

#11265 fixed a similar issue for iOS and macOS. mbgl::LatLngBounds has methods like unwrapForShortestPath() to account for ambiguity when spanning the antimeridian. Note that fixing this issue may reveal latent issues in other methods that deal with cameras.