Multiple exposed sorts are not supported

Example: you want to allow the user to sort by either most recent or by title. Using one or the other as an exposed sort works fine, but if you try to expose both, then the 2nd sort is never used even if it's the one that's selected.

So if the first sort is "created date" and the 2nd sort is "title" and both are exposed, if the user selects "title" as the sort, it will still just sort by "created date".

Here's a view export to reproduce:

$view = new view();
$view->name = 'test_sort_view';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'efq_node';
$view->human_name = 'Test Sort view';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['access']['type'] = 'none';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['style_plugin'] = 'default';
$handler->display->display_options['row_plugin'] = 'fields';
/* Field: Node: Node ID */
$handler->display->display_options['fields']['nid']['id'] = 'nid';
$handler->display->display_options['fields']['nid']['table'] = 'efq_node';
$handler->display->display_options['fields']['nid']['field'] = 'nid';
/* Sort criterion: Node: Date created */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'efq_node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
$handler->display->display_options['sorts']['created']['exposed'] = TRUE;
$handler->display->display_options['sorts']['created']['expose']['label'] = 'Most Recent';
/* Sort criterion: Node: Title */
$handler->display->display_options['sorts']['title']['id'] = 'title';
$handler->display->display_options['sorts']['title']['table'] = 'efq_node';
$handler->display->display_options['sorts']['title']['field'] = 'title';
$handler->display->display_options['sorts']['title']['order'] = 'DESC';
$handler->display->display_options['sorts']['title']['exposed'] = TRUE;
$handler->display->display_options['sorts']['title']['expose']['label'] = 'Alphabetical';