User is not notified of unsupported behavior (nested SetParent)

Steps to reproduce:

1. Create a VisualElement that removes itself from its parent when it gets AttachToPanelEvent.

2. Add it to a panel.

Actual results: 

No error is reported

Expected results: 

An error is reported

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

•