enum State {
    case disabled // No rows
    case awaiting // Input row
    case finished  // Input row + feedback row
}

func updateForState(old oldState: State, new newState: State) {
    
    switch (oldState, newState) {
        
    case (.disabled, .disabled), (.awaiting, .awaiting), (.finished, .finished):
        print("Do nothing")
        
    case (.disabled, _): // Compiler thinks the switch isn't exhaustive
//    case (.disabled, .awaiting), (.disabled, .finished): // If this case is used instead, compiler is happy.
        print("Reload whole section")
        
    case (_, .disabled):
        print("Reload whole section")
        
    case (.awaiting, .finished):
        print("Insert feedback row")
        
    case (.finished, .awaiting):
        print("Remove feedback row")
    }
}