/**
  * Discern whether teh scrap <code>groupId</code> exists in the currently displayed canvas (if
  * any).
  */
 private boolean isCurrentlyDisplayed(long groupId) {
   if (!CanvasPerspective.getInstance().isActive()) {
     return false;
   }
   return (CGroupController.groupdb.get(groupId).getCanvasUID()
       == CCanvasController.getCurrentUUID());
 }
  /** Change the color of a tag in this plugin's internal model */
  public void localSetIntentionTypeColor(long typeId, int colorIndex) {
    activeIntentionTypes.get(typeId).setColorIndex(colorIndex);

    if (CanvasPerspective.getInstance().isActive()) {
      CanvasTagPanel.getInstance().refresh();
    }
  }