It would be nice to be able to sort by groups when manually grading quizzes. In our environment at least there are quizzes taken at different times, so only 1 group might be left to grade. It's a pain to see all the users.

I have included the patch that fixes it.

//print activity group selector - Line 38 of /mod/quiz/report/grading/report.php

$userid = optional_param('userid', -1, PARAM_INT); //keeps it off of the grading page for one user
if($userid<0){
$reporturl = $CFG->wwwroot.'/mod/quiz/report.php?mode=grading';
$reporturlwithoptions = $reporturl . '&amp;q=' . $quiz->id . '&amp;action='.$action.'&amp;questionid=' . $questionid;

/// find out current groups mode
$currentgroup = groups_get_activity_group($cm, true);

if ($groupmode = groups_get_activity_groupmode($cm)) { // Groups are being used

groups_print_activity_menu($cm, $reporturlwithoptions);

}
}


//get users of specified group if group set or isn't all participants - Line 198 of /mod/quiz/report/grading/report.php (just before $userids = implode(',', array_keys($users)); )
               $groupid = optional_param('group', -1, PARAM_INT);
if($groupid>0){
$users = groups_get_members($groupid, $fields='u.id', $sort='firstname ASC');
}