Function lookup

docs/app/js/sanddance-app.js:120165–120168

(_)

    }
});
function lookup(_) {
    const g = _.groups, p = _.parent;
    return g && g.size === 1 ? g.get(Object.keys(g.object)[0]) : g && p ? g.lookup(p) : null;
}
/**
 * Analyze items for overlap, changing opacity to hide items with
 * overlapping bounding boxes. This transform will preserve at least