emitBlurEvent(event, pointer, object) {
    const properties = this._initBaseEvent(event, pointer);

    if (object.hover === true) {
      object.hover = false;
      if (object instanceof Node) {
        properties.node = object.id;
        this.body.emitter.emit("blurNode", properties);
      } else {
        properties.edge = object.id;
        this.body.emitter.emit("blurEdge", properties);
      }
    }
  }
Remove the highlight from a node or edge, in response to mouse movement
@param {Event}  event
@param {{x: number, y: number}} pointer object with the x and y screen coordinates of the mouse
@param {Node|vis.Edge} object
@private