"Set order status" action doesn't work correctly

The problem comes from VBO that runs entity_save() on the *old* order object after it runs the action.

  public function execute($data, array $context) {
    $context['entity_type'] = $this->entityType;
    $context['settings'] = $this->getAdminOption('settings', array());
    $context += $this->formOptions;
    $context += $this->operationInfo['parameters'];
    // Actions provided by the Drupal system module require the entity to be
    // present in $context, keyed by entity type.
    if (is_object($data)) {
      $context[$this->entityType] = $data;
    }

    actions_do($this->operationInfo['callback'], $data, $context);

    // The action might need to have its entities saved after execution.
    if (in_array('changes_property', $this->operationInfo['behavior'])) {
      $data = is_array($data) ? $data : array($data);
      foreach ($data as $entity) {
        entity_save($this->entityType, $entity);
      }
    }
  }

Having dug through the code I'm not sure it's possible to fix in Ubercart as VBO just uses actions_do() to run the operation, which doesn't pass the object by reference, meaning that the changed object can't be pushed back up to the original process.

Dangit.

The issue is that VBO assumes that if the action's "behavior" value (see hook_action_info()) should be "changes_property" if it isn't defined.

The solution seems to be to set "behavior" to a value that doesn't do anything.