public function render()
 {
     require_celerity_resource('differential-revision-comment-list-css');
     $engine = PhabricatorMarkupEngine::newDifferentialMarkupEngine(array('differential.diff' => $this->target));
     $inlines = mgroup($this->inlines, 'getCommentID');
     $num = 1;
     $html = array();
     foreach ($this->comments as $comment) {
         $view = new DifferentialRevisionCommentView();
         $view->setComment($comment);
         $view->setUser($this->user);
         $view->setHandles($this->handles);
         $view->setMarkupEngine($engine);
         $view->setInlineComments(idx($inlines, $comment->getID(), array()));
         $view->setChangesets($this->changesets);
         $view->setTargetDiff($this->target);
         $view->setVersusDiffID($this->versusDiffID);
         $view->setCommentNumber($num++);
         $html[] = $view->render();
     }
     $objs = array_reverse(array_values($this->comments));
     $html = array_reverse(array_values($html));
     $user = $this->user;
     $last_comment = null;
     // Find the most recent comment by the viewer.
     foreach ($objs as $position => $comment) {
         if ($user && $comment->getAuthorPHID() == $user->getPHID()) {
             if ($last_comment === null) {
                 $last_comment = $position;
             } else {
                 if ($last_comment == $position - 1) {
                     // If the viewer made several comments in a row, show them all. This
                     // is a spaz rule for epriestley.
                     $last_comment = $position;
                 }
             }
         }
     }
     $header = array();
     $hidden = array();
     if ($last_comment !== null) {
         foreach ($objs as $position => $comment) {
             if (!$comment->getID()) {
                 // These are synthetic comments with summary/test plan information.
                 $header[] = $html[$position];
                 unset($html[$position]);
                 continue;
             }
             if ($position <= $last_comment) {
                 // Always show comments after the viewer's last comment.
                 continue;
             }
             if ($position < 3) {
                 // Always show the 3 most recent comments.
                 continue;
             }
             $hidden[] = $position;
         }
     }
     if (count($hidden) <= 3) {
         // Don't hide if there's not much to hide.
         $hidden = array();
     }
     $header = array_reverse($header);
     $hidden = array_select_keys($html, $hidden);
     $visible = array_diff_key($html, $hidden);
     $hidden = array_reverse($hidden);
     $visible = array_reverse($visible);
     if ($hidden) {
         Javelin::initBehavior('differential-show-all-comments', array('markup' => implode("\n", $hidden)));
         $hidden = javelin_render_tag('div', array('sigil' => "differential-all-comments-container"), '<div class="differential-older-comments-are-hidden">' . number_format(count($hidden)) . ' older comments are hidden. ' . javelin_render_tag('a', array('href' => '#', 'mustcapture' => true, 'sigil' => 'differential-show-all-comments'), 'Show all comments.') . '</div>');
     } else {
         $hidden = null;
     }
     return '<div class="differential-comment-list">' . implode("\n", $header) . $hidden . implode("\n", $visible) . '</div>';
 }