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diff --git a/web/core/modules/taxonomy/src/Plugin/views/argument/IndexTidDepth.php b/web/core/modules/taxonomy/src/Plugin/views/argument/IndexTidDepth.php
new file mode 100644
index 000000000..6933e7456
--- /dev/null
+++ b/web/core/modules/taxonomy/src/Plugin/views/argument/IndexTidDepth.php
@@ -0,0 +1,142 @@
+<?php
+
+namespace Drupal\taxonomy\Plugin\views\argument;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\views\Plugin\views\argument\ArgumentPluginBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Argument handler for taxonomy terms with depth.
+ *
+ * This handler is actually part of the node table and has some restrictions,
+ * because it uses a subquery to find nodes with.
+ *
+ * @ingroup views_argument_handlers
+ *
+ * @ViewsArgument("taxonomy_index_tid_depth")
+ */
+class IndexTidDepth extends ArgumentPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * @var EntityStorageInterface
+   */
+  protected $termStorage;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityStorageInterface $termStorage) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->termStorage = $termStorage;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity.manager')->getStorage('taxonomy_term'));
+  }
+
+  protected function defineOptions() {
+    $options = parent::defineOptions();
+
+    $options['depth'] = ['default' => 0];
+    $options['break_phrase'] = ['default' => FALSE];
+    $options['use_taxonomy_term_path'] = ['default' => FALSE];
+
+    return $options;
+  }
+
+  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
+    $form['depth'] = [
+      '#type' => 'weight',
+      '#title' => $this->t('Depth'),
+      '#default_value' => $this->options['depth'],
+      '#description' => $this->t('The depth will match nodes tagged with terms in the hierarchy. For example, if you have the term "fruit" and a child term "apple", with a depth of 1 (or higher) then filtering for the term "fruit" will get nodes that are tagged with "apple" as well as "fruit". If negative, the reverse is true; searching for "apple" will also pick up nodes tagged with "fruit" if depth is -1 (or lower).'),
+    ];
+
+    $form['break_phrase'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Allow multiple values'),
+      '#description' => $this->t('If selected, users can enter multiple values in the form of 1+2+3. Due to the number of JOINs it would require, AND will be treated as OR with this filter.'),
+      '#default_value' => !empty($this->options['break_phrase']),
+    ];
+
+    parent::buildOptionsForm($form, $form_state);
+  }
+
+  /**
+   * Override defaultActions() to remove summary actions.
+   */
+  protected function defaultActions($which = NULL) {
+    if ($which) {
+      if (in_array($which, ['ignore', 'not found', 'empty', 'default'])) {
+        return parent::defaultActions($which);
+      }
+      return;
+    }
+    $actions = parent::defaultActions();
+    unset($actions['summary asc']);
+    unset($actions['summary desc']);
+    unset($actions['summary asc by count']);
+    unset($actions['summary desc by count']);
+    return $actions;
+  }
+
+  public function query($group_by = FALSE) {
+    $this->ensureMyTable();
+
+    if (!empty($this->options['break_phrase'])) {
+      $break = static::breakString($this->argument);
+      if ($break->value === [-1]) {
+        return FALSE;
+      }
+
+      $operator = (count($break->value) > 1) ? 'IN' : '=';
+      $tids = $break->value;
+    }
+    else {
+      $operator = "=";
+      $tids = $this->argument;
+    }
+    // Now build the subqueries.
+    $subquery = db_select('taxonomy_index', 'tn');
+    $subquery->addField('tn', 'nid');
+    $where = db_or()->condition('tn.tid', $tids, $operator);
+    $last = "tn";
+
+    if ($this->options['depth'] > 0) {
+      $subquery->leftJoin('taxonomy_term_hierarchy', 'th', "th.tid = tn.tid");
+      $last = "th";
+      foreach (range(1, abs($this->options['depth'])) as $count) {
+        $subquery->leftJoin('taxonomy_term_hierarchy', "th$count", "$last.parent = th$count.tid");
+        $where->condition("th$count.tid", $tids, $operator);
+        $last = "th$count";
+      }
+    }
+    elseif ($this->options['depth'] < 0) {
+      foreach (range(1, abs($this->options['depth'])) as $count) {
+        $subquery->leftJoin('taxonomy_term_hierarchy', "th$count", "$last.tid = th$count.parent");
+        $where->condition("th$count.tid", $tids, $operator);
+        $last = "th$count";
+      }
+    }
+
+    $subquery->condition($where);
+    $this->query->addWhere(0, "$this->tableAlias.$this->realField", $subquery, 'IN');
+  }
+
+  public function title() {
+    $term = $this->termStorage->load($this->argument);
+    if (!empty($term)) {
+      return $term->getName();
+    }
+    // TODO review text
+    return $this->t('No name');
+  }
+
+}