If you select many objects (or other items too), and select Toggle Visibility, This will act as if you press on each items visibility (which makes some sense).
However this isn't really great behavior when there is already mixed visibility state.
It would be better if this worked like (de-select all).
- If there are any items enabled, disable all.
- if none are enabled, enable all.
This goes Toggle visibility, renderability, selectability too.
This was a user request, discussed with Brecht and we agreed this would be an improvement.