Fatal error on node save: Call to undefined method Drupal\redirect\Entity\Redirect::setPublished()

Root cause

RedirectWidgetManager::submitRedirectWidgetForm() and getRedirectWidget() call isPublished(), setPublished(), and setUnpublished() on Redirect entities. These methods are provided by EntityPublishedTrait, which was only added to Redirect in redirect 1.12.0. Earlier versions (including 1.11.0 and below) do not implement EntityPublishedInterface, so these calls trigger a fatal error.

The redirect_widget composer.json requires drupal/redirect: ^1.0, which allows installing with any 1.x version including those without published state support.

Fix

All five call sites are now guarded with $entity instanceof EntityPublishedInterface checks:

- getRedirectWidget() line 92: disclaimer for unpublished redirects
- submitRedirectWidgetForm() line 197: prevent removal of published redirects in unpublished state
- submitRedirectWidgetForm() lines 220-232: publish/unpublish logic

When the redirect entity does not support the published state (redirect < 1.12.0), the publish/unpublish logic is simply skipped and the redirect is saved as-is. The status message for new redirects is now shown regardless of published state support.

Thanks for bringing this issue to light. However, I don't think it's a good solution to make this backwards compatible with older versions of the Redirect module, as this module was created and released after their release of 1.12. Whilst your fix seems fine, I fear that in the long run this will introduce unnecessary complexity in the code.

Therefore I will just specify the version of Redirect required for this module and link to this issue for those who want to patch to older versions.

I appreciate the effort!