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diff --git a/web/modules/contrib/diff/src/VisualDiffThemeNegotiator.php b/web/modules/contrib/diff/src/VisualDiffThemeNegotiator.php
new file mode 100644
index 000000000..e5678c478
--- /dev/null
+++ b/web/modules/contrib/diff/src/VisualDiffThemeNegotiator.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace Drupal\diff;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Theme\ThemeNegotiatorInterface;
+
+/**
+ * Visual inline layout theme negotiator.
+ *
+ * @package Drupal\diff
+ */
+class VisualDiffThemeNegotiator implements ThemeNegotiatorInterface {
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * VisualDiffThemeNegotiator constructor.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory) {
+    $this->configFactory = $config_factory;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(RouteMatchInterface $routeMatch) {
+    if ($routeMatch->getParameter('filter') !== 'visual_inline') {
+      return FALSE;
+    }
+
+    if (!$this->isDiffRoute($routeMatch)) {
+      return FALSE;
+    }
+
+    if ($this->configFactory->get('diff.settings')->get('general_settings.visual_inline_theme') !== 'default') {
+      return FALSE;
+    }
+
+    return TRUE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function determineActiveTheme(RouteMatchInterface $route_match) {
+    return $this->configFactory->get('system.theme')->get('default');
+  }
+
+  /**
+   * Checks if route names for node or other entity are corresponding.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   Route match object.
+   *
+   * @return bool
+   *   Return TRUE if route name is ok.
+   */
+  protected function isDiffRoute(RouteMatchInterface $route_match) {
+    $regex_pattern = '/^entity\..*\.revisions_diff$/';
+    return $route_match->getRouteName() === 'diff.revisions_diff' ||
+      preg_match($regex_pattern, $route_match->getRouteName());
+  }
+
+}