Use the new title method on views pages

+++ b/core/modules/views/lib/Drupal/views/Plugin/views/display/PathPluginBase.php
@@ -119,6 +119,11 @@ public function collectRoutes(RouteCollection $collection) {
+    if ($title = $this->getOption('title')) {
+      $route->setDefault('_title', $title);
+    }

Should we always just set this, regardless of whether it's empty of not? What will the default be otherwise?

Rerolled, and fixed the ViewPageControllerTest. I think if we are returning a render array only now, we can just check all the keys we expect are present?

The only other failure now should be the HTTPStatusCode area handler. As it currently relies on setting the statusCode on the response, which we were returning, but not anymore. So we need to deal with this differently.

Could do that, then we would need a view subscriber and a new method that the subscriber would check?

Bumping to major, this looks like it needs updating for Twig autoescape/safe markup.

Found this issue via #2214525: Remove unused Drupal\Core\Utility\Title - this is the only remaining use of that.

Related: #2359901: Discourage $main_content['#title'] in favor of route titles and title callbacks.

Marking duplicate then for whatever has been fixed in Views since nothing went in through this issue.

There is still a broken usage of a Utility\Title constant left in Drupal\views\Plugin\views\area\Title but I think we can remove that in #2214525: Remove unused Drupal\Core\Utility\Title, please confirm.