Function ensureLayerIsVisible

ensureLayerIsVisible(layerId): void
JMap.Layer.ensureLayerIsVisible

Make sure a layer is visible on the Map. All parent layers will also be made visible
Parameters
- layerId: JId
  The JMap layer id
Returns void
Example
```
// show layer id=5 (and all parent layers)
JMap.Layer.ensureLayerIsVisible(5)
```