class ViewModel::AccessControl

def visible!(view, context:)

* when no children could contribute to the result
* on root views
valid to run:
checking is run directly on one node without any tree context, it's only
Wrappers to check access control for a single view directly. Because the 
def visible!(view, context:)
  run_callback(ViewModel::Callbacks::Hook::BeforeVisit, view, context)
  run_callback(ViewModel::Callbacks::Hook::AfterVisit,  view, context)
end