Add a way to programmatically remove an item from a queue

Can you try this function?

/**
 * Removes an item from a subqueue.
 *
 * @param \EntitySubqueue $subqueue
 *   An entity subqueue.
 * @param string|int $reference_id
 *   An entity ID to remove from the subqueue.
 */
function entityqueue_subqueue_remove_item(EntitySubqueue $subqueue, $reference_id) {
  // Get the corresponding queue for this subqueue.
  $queue = entityqueue_queue_load($subqueue->queue);
  $field_name = _entityqueue_get_target_field_name($queue->target_type);

  // Filter the field items and remove the referenced ID.
  $field_items = field_get_items('entityqueue_subqueue', $subqueue, $field_name);
  $field_items = array_filter($field_items, function($value) use ($reference_id) {
    return ($value['target_id'] != $reference_id);
  });

  // Set the filtered item list on the subqueue.
  $langcode = field_language('entityqueue_subqueue', $subqueue, $field_name, NULL);
  $subqueue->{$field_name}[$langcode] = $field_items;

  $subqueue->save();
}

Looks good!

@zietbukuel #2 only works for D7 :) In D8 it would be much easier to do..

Give it a try and if it works for you, I'll commit it to the 7.x-1.x branch.

This is work!

Thanks for testing! Committed and pushed to 7.x-1.x.

Moving to 8.x now :)

The ability to remove an item programmatically was added to 8.x in #2145441: Add an Entityqueue tab on entity pages.