##### SUMMARY
Since `add_host` and `group_by` actions only modify the runtime inventory, hosts/groups/vars added by them don't survive a `meta: refresh_inventory` call (since that call completely clears the runtime inventory). 

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
InventoryManager

##### ADDITIONAL INFORMATION
After some internal discussion, the general consensus seemed to be that this behavior is an undesirable default. The `add_host` and `group_by` actions should manage a more persistent state independent of the runtime inventory, then apply their changes to the running inventory. When a `meta: refresh_inventory` occurs, the normal dynamic inventory clear/refresh should happen, then reapply the add_host/group_by state. This should probably be the default behavior, but a config switch or a different `meta` action (or an arg to it) to emulate the current behavior could also be created if necessary.

return []
    def _filter_notified_hosts(self, notified_hosts):
        '''
        Filter notified hosts accordingly to strategy
        '''
        
        
        return notified_hosts[:]
    def _take_step(self, task, host=None):
        ret = False
        msg = u'Perform task: %s ' % task
        if host:
            msg += u'on %s ' % host
        msg += u'(N)o/(y)es/(c)ontinue: '
        resp = display.prompt(msg)
        if resp.lower() in ['y', 'yes']:
            display.debug("User ran task")
            ret = True
        elif resp.lower() in ['c', 'continue']:
            display.debug("User ran task and canceled step mode")
            self._step = False
            ret = True
        else:
            display.debug("User skipped task")
        display.banner(msg)
        return ret
    def _cond_not_supported_warn(self, task_name):
        display.warning("%s task does not support when conditional" % task_name)
    def _execute_meta(self, task, play_context, iterator, target_host):