1. A concise explanation of the problem you’re experiencing.
Picking a GroundPolylineGeometry hangs my browser
2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
All other Geometries and entities are pickable why shouldn’t GroundPolylineGeometry
4. The Cesium version you’re using, your operating system and browser.
Cesium 1.48, Windows 7, Chrome 67.0.3396.99