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diff --git a/web/modules/contrib/devel/src/Form/ConfigsList.php b/web/modules/contrib/devel/src/Form/ConfigsList.php
new file mode 100644
index 000000000..f0993e77b
--- /dev/null
+++ b/web/modules/contrib/devel/src/Form/ConfigsList.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace Drupal\devel\Form;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Form that displays all the config variables to edit them.
+ */
+class ConfigsList extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'devel_config_system_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $filter = '') {
+    $form['filter'] = array(
+      '#type' => 'details',
+      '#title' => t('Filter variables'),
+      '#attributes' => array('class' => array('container-inline')),
+      '#open' => isset($filter) && trim($filter) != '',
+    );
+    $form['filter']['name'] = array(
+      '#type' => 'textfield',
+      '#title' => $this->t('Variable name'),
+      '#title_display' => 'invisible',
+      '#default_value' => $filter,
+    );
+    $form['filter']['show'] = array(
+      '#type' => 'submit',
+      '#value' => $this->t('Filter'),
+    );
+
+    $header = array(
+      'name' => array('data' => $this->t('Name')),
+      'edit' => array('data' => $this->t('Operations')),
+    );
+
+    $rows = array();
+
+    $destination = $this->getDestinationArray();
+
+    // List all the variables filtered if any filter was provided.
+    $names = $this->configFactory()->listAll($filter);
+
+    foreach ($names as $config_name) {
+      $operations['edit'] = array(
+        'title' => $this->t('Edit'),
+        'url' => Url::fromRoute('devel.config_edit', array('config_name' => $config_name)),
+        'query' => $destination
+      );
+      $rows[] = array(
+        'name' => $config_name,
+        'operation' => array('data' => array('#type' => 'operations', '#links' => $operations)),
+      );
+    }
+
+    $form['variables'] = array(
+      '#type' => 'table',
+      '#header' => $header,
+      '#rows' => $rows,
+      '#empty' => $this->t('No variables found')
+    );
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $filter = $form_state->getValue('name');
+    $form_state->setRedirectUrl(Url::FromRoute('devel.configs_list', array('filter' => Html::escape($filter))));
+  }
+
+}