@Nullable
  private static XValueMarkers<?, ?> getValueMarkers(AnActionEvent event) {
    XDebugSession session = DebuggerUIUtil.getSession(event);
    return session != null ? ((XDebugSessionImpl)session).getValueMarkers() : null;
  }
@Nullable
  private static XValueMarkers<?, ?> getValueMarkers(AnActionEvent event)