Incorrect page_title title in browser toolbar

Rerolled patch for Drupal 10.3.x

wengerk → changed the visibility of the branch 2752227-incorrect-pagetitle-title to hidden.

Openned an issue fork to run tests againts patch. I found some mistake on the rerolled patch in #50 and fix thoses issues on the Fork.
Seems to works now. I just rerolled the patch and change this code.

  public function pageTitle($page_manager_page_variant) {
    if (is_string($page_manager_page_variant)) {
        $page_manager_page_variant = $this->entityRepository->loadEntityByConfigTarget('page_variant', $page_manager_page_variant);
    }

to this

  public function pageTitle(Request $request) {
    $attributes = $request->attributes->all();
    if (!isset($attributes['_page_manager_page_variant'])) {
      return '';
    }

    if (is_string($attributes['_page_manager_page_variant'])) {
      $page_manager_page_variant = $this->entityRepository->loadEntityByConfigTarget('page_variant', $attributes['_page_manager_page_variant']);
    } elseif ($attributes['_page_manager_page_variant'] instanceof PageVariantInterface) {
      $page_manager_page_variant = $attributes['_page_manager_page_variant'];
    } else {
      return '';
    }