code: function (el) {
      var hoverIndex = this.hoverEls.indexOf(el)
      if (hoverIndex !== -1 &&
          this.hoverElsIntersections[hoverIndex].distance == null) {
        this.hoverEls.splice(hoverIndex, 1)
        const sect = this.hoverElsIntersections.splice(hoverIndex, 1)
        this.hoverEls.push(el)
        this.hoverElsIntersections.push(sect[0])
      }
    }
docs: Helper to ensure dropping and regrabbing finds the same target for for order-sorted hoverEls (grabbing; no-op for distance-sorted (pointing)