}
@Override
public UiBuilder render(final ConversationThread thread,
final IdentityMap<ConversationBlip, UiBuilder> blipUis) {
HtmlClosure blipsUi = new HtmlClosure() {
@Override
public void outputHtml(SafeHtmlBuilder out) {
for (ConversationBlip blip : thread.getBlips()) {
UiBuilder blipUi = blipUis.get(blip);
// Not all blips are rendered.