Privatemsg tags support

Note that we don't have tag support yet (at all!) so I renamed the issue.

yes, needed very much. can be done also with Flags module support, but that would limit to predefined common for all flags/tags, so tags probably would be best. must discuss ways to implement. This would be important if communications with users is done via privatemsg - i (or modules) could tag messages like "system notification", "friend request", "reminder", "invitation to event" etc.

offtopic about example png: SEO analysis is also what my family is talking about a lot these days ;)

i m using
Privatemsg Views version : 6.x-1.0-beta2
Views : 6.x-2.8
Private messages : 6.x-1.1

i dont knw much abt view. but for try i add these lines

in privatemsg_views.view.inc

function privatemsg_views_views_data_alter(&$data) {
Line number: 289

if (module_exists('privatemsg_filter')) {	
    $data['pm_tags_index']['table']['group']  = t('Privatemsg');
    $data['pm_tags_index']['table']['join'] = array(
      'pm_index' => array(
        'left_field' => 'thread_id',
        'field' => 'thread_id',
        'handler' => 'views_multiple_field_join',
        'extra' => array(
          'tag_id' => array(
            'field' => 'tag_id',
          ),		
        ),
		'filter' => array(
		  'handler' => 'privatemsg_views_handler_filter_tag_id',
		),
      ),
    );
}    

but it produce nothing .no filter
need help from experts