fix/breadcrumb hook improvement (#945)

apps/drupal-default/particle_theme/includes/navigation.theme.inc

@@ -4,3 +4,31 @@
  * @file
  * Functions to support theming menu navigation in the Particle theme.
  */
+
+use Drupal\search\SearchPageInterface;
+
+/**
+ * Implements hook_preprocess_breadcrumb().
+ */
+function particle_preprocess_breadcrumb(&$variables) {
+  // Taken from Umami theme
+  // We are creating a variable for the Current Page Title, to allow us to print
+  // it after the breadcrumbs loop has run.
+  $route_match = Drupal::routeMatch();
+  // Search page titles aren't resolved using the title_resolver service - it
+  // will always return 'Search' instead of 'Search for [term]', which would
+  // give us a breadcrumb of Home >> Search >> Search.
+  // @todo Revisit after https://www.drupal.org/project/drupal/issues/2359901
+  // @todo Revisit after https://www.drupal.org/project/drupal/issues/2403359
+  $entity = $route_match->getParameter('entity');
+  if ($entity instanceof SearchPageInterface) {
+    $variables['current_page_title'] = $entity->getPlugin()->suggestedTitle();
+  }
+  else {
+    $variables['current_page_title'] = Drupal::service('title_resolver')->getTitle(Drupal::request(), $route_match->getRouteObject());
+  }
+  // Since we are printing the 'Current Page Title', add the URL cache context.
+  // If we don't, then we might end up with something like
+  // "Home > Articles" on the Recipes page, which should read "Home > Recipes".
+  $variables['#cache']['contexts'][] = 'url';
+}