Return original geometry for GeoJSON features in queryRenderedFeatures

[ryanhamley]

Motivation

Consider https://jsfiddle.net/w9bs8jot/. A GeoJSON Line feature is cut into multiple tiles and makes it impossible to query the entire line feature. A customer recently flagged this issue because they wanted users to be able to click on a line feature and get its start and/or end points.

Design Alternatives

There's a potential workaround.

const selectedFeatures = map.queryRenderedFeatures(point);
selectedFeatures.forEach(feature => {
    const source = map.getSource(feature.source);
    // filter for the feature's original coordinates in the source
    console.log('source data: ', source._data.features[0].geometry.coordinates);
})

Design

We could add the original geometry to the features in a GeoJSON vector tile, although this may not be performant enough with large GeoJSON features.

Alternatively, queryRenderedFeatures needs a way to retrieve the original geometry for the feature.

[1ec5]

#5639 seems to cover the same thing.