code: function removeFromList(imageIdIndex) {
      const index = stackPrefetch.indicesToRequest.indexOf(imageIdIndex);
  
      if (index > -1) {
        // Don't remove last element if imageIdIndex not found
        stackPrefetch.indicesToRequest.splice(index, 1);
      }
    }
docs: Remove an imageIdIndex from the list of indices to request This fires when the individual image loading deferred is resolved