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diff --git a/web/core/modules/settings_tray/src/Ajax/OpenOffCanvasDialogCommand.php b/web/core/modules/settings_tray/src/Ajax/OpenOffCanvasDialogCommand.php
new file mode 100644
index 000000000..c49c42e02
--- /dev/null
+++ b/web/core/modules/settings_tray/src/Ajax/OpenOffCanvasDialogCommand.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace Drupal\settings_tray\Ajax;
+
+use Drupal\Core\Ajax\OpenDialogCommand;
+
+/**
+ * Defines an AJAX command to open content in a dialog in a off-canvas dialog.
+ *
+ * @ingroup ajax
+ *
+ * @internal
+ */
+class OpenOffCanvasDialogCommand extends OpenDialogCommand {
+
+  /**
+   * The dialog width to use if none is provided.
+   */
+  const DEFAULT_DIALOG_WIDTH = 300;
+
+  /**
+   * Constructs an OpenOffCanvasDialogCommand object.
+   *
+   * The off-canvas dialog differs from the normal modal provided by
+   * OpenDialogCommand in that a off-canvas has built in positioning and
+   * behaviours. Drupal provides a built-in off-canvas dialog for this purpose,
+   * so the selector is hard-coded in the call to the parent constructor.
+   *
+   * @param string $title
+   *   The title of the dialog.
+   * @param string|array $content
+   *   The content that will be placed in the dialog, either a render array
+   *   or an HTML string.
+   * @param array $dialog_options
+   *   (optional) Settings to be passed to the dialog implementation. Any
+   *   jQuery UI option can be used. See http://api.jqueryui.com/dialog.
+   * @param array|null $settings
+   *   (optional) Custom settings that will be passed to the Drupal behaviors
+   *   on the content of the dialog. If left empty, the settings will be
+   *   populated automatically from the current request.
+   */
+  public function __construct($title, $content, array $dialog_options = [], $settings = NULL) {
+    parent::__construct('#drupal-off-canvas', $title, $content, $dialog_options, $settings);
+    $this->dialogOptions['modal'] = FALSE;
+    $this->dialogOptions['autoResize'] = FALSE;
+    $this->dialogOptions['resizable'] = 'w';
+    $this->dialogOptions['draggable'] = FALSE;
+    $this->dialogOptions['drupalAutoButtons'] = FALSE;
+    // @todo drupal.ajax.js does not respect drupalAutoButtons properly, pass an
+    //   empty set of buttons until https://www.drupal.org/node/2793343 is in.
+    $this->dialogOptions['buttons'] = [];
+    if (empty($dialog_options['dialogClass'])) {
+      $this->dialogOptions['dialogClass'] = 'ui-dialog-off-canvas';
+    }
+    // If no width option is provided then use the default width to avoid the
+    // dialog staying at the width of the previous instance when opened
+    // more than once, with different widths, on a single page.
+    if (!isset($this->dialogOptions['width'])) {
+      $this->dialogOptions['width'] = static::DEFAULT_DIALOG_WIDTH;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function render() {
+    $build = parent::render();
+    $build['effect'] = 'fade';
+    $build['speed'] = 1000;
+    return $build;
+  }
+
+}