Do we have a observer that can observe if there is a changes in the component definition?

[DanRathbun]

I just did a quick test, and EntityObserver#onChange() does not fire when attached to a definition and it’s Entities collection members are modified.

However, attaching an EntitiesObserver subclass instance to the definition’s Entities collection will fire the onElementModified callback for each child Face that changes.

• Weirdly, even though the edges bounding the 6 faces must also change, they are not sent to the callback when I use Entities#transform_entities to scale the entire collection of elements.