Add support for GeometryCollection feature type

[shaietz]

Currently, features of type GeometryCollection are not supported, as seen in stylefunction.js types declaration:
const types = { 'Point': 1, 'MultiPoint': 1, 'LineString': 2, 'MultiLineString': 2, 'Polygon': 3, 'MultiPolygon': 3, };

when a feature of type GeometryCollection is encountered, const type = types[featureGeometry.getType()]; (stylefunction.js line 556) is undefined and no styles are applied.

adding support for GeometryCollection is a matter of iterating over the inner geometries and the styles based on the inner geometry type.

[ahocevar]

What's your source type? vector sources in MVT format don't support geometry collections. geojson sources could be fixed with what you're envisioning. Do you want to create a pull request? Before you start though, it would be interesting to see how Mapbox and MapLibre handle geometry collections.

[shaietz]

Yes my source is geojson
Ill start working on a PR

[shaietz]

i opened a PR: #1384