function useredit_update_trackforums($user, $usernew)
{
    global $CFG;
    if (!isset($usernew->trackforums)) {
        //locked field
        return;
    }
    if (!isset($user->trackforums) || $usernew->trackforums != $user->trackforums and !$usernew->trackforums) {
        require_once $CFG->dirroot . '/mod/forum/lib.php';
        forum_tp_delete_read_records($usernew->id);
    }
}

/**
 * @global object
 * @global object
 * @param int $forumid
 * @param int $userid
 */
function forum_tp_stop_tracking($forumid, $userid=false) {
    global $USER, $DB;

    if ($userid === false) {
        $userid = $USER->id;
    }

    if (!$DB->record_exists('forum_track_prefs', array('userid' => $userid, 'forumid' => $forumid))) {
        $track_prefs = new stdClass();
        $track_prefs->userid = $userid;
        $track_prefs->forumid = $forumid;
        $DB->insert_record('forum_track_prefs', $track_prefs);
    }

    return forum_tp_delete_read_records($userid, -1, -1, $forumid);
}

} else {
    $parent = $discussion->firstpost;
}
if (!($post = forum_get_post_full($parent))) {
    print_error("notexists", 'forum', "{$CFG->wwwroot}/mod/forum/view.php?f={$forum->id}");
}
if (!forum_user_can_see_post($forum, $discussion, $post, null, $cm)) {
    print_error('noviewdiscussionspermission', 'forum', "{$CFG->wwwroot}/mod/forum/view.php?id={$forum->id}");
}
if ($mark == 'read' or $mark == 'unread') {
    if ($CFG->forum_usermarksread && forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
        if ($mark == 'read') {
            forum_tp_add_read_record($USER->id, $postid);
        } else {
            // unread
            forum_tp_delete_read_records($USER->id, $postid);
        }
    }
}
$searchform = forum_search_form($course);
$forumnode = $PAGE->navigation->find($cm->id, navigation_node::TYPE_ACTIVITY);
if (empty($forumnode)) {
    $forumnode = $PAGE->navbar;
} else {
    $forumnode->make_active();
}
$node = $forumnode->add(format_string($discussion->name), new moodle_url('/mod/forum/discuss.php', array('d' => $discussion->id)));
$node->display = false;
if ($node && $post->id != $discussion->firstpost) {
    $node->add(format_string($post->subject), $PAGE->url);
}

/**
 *
 */
function forum_tp_stop_tracking($forumid, $userid = false)
{
    global $USER;
    if ($userid === false) {
        $userid = $USER->id;
    }
    if (!record_exists('forum_track_prefs', 'userid', $userid, 'forumid', $forumid)) {
        $track_prefs = new object();
        $track_prefs->userid = $userid;
        $track_prefs->forumid = $forumid;
        insert_record('forum_track_prefs', $track_prefs);
    }
    return forum_tp_delete_read_records($userid, -1, -1, $forumid);
}