Steps to reproduce:

1. Create a GameObject (e.g. Cube)
2. Press the little eye icon in the "Hierarchy"-window to hide it.
3. Delete the object

What happens:
The respective "Visibility"-window in the scene-view still shows "1 hidden object"

Expected:
The caption is updated. If there are no hidden objects anymore, the "Visibility"window should disappear or display a respective message.

Additional comments:
When doing this inside a hierarchy (e.g. creating a root, appending a new object (e.g. Cube) as a child, hiding the cube and deleting it) will update the visibility window; This bug only seems to appear for root objects.