Use DevelDumperManager in DevelController instead of kprint_r()

Synopsis

If the Devel module is installed, Search API Solr provides a Solr tab below the Devel tab of an entity via \Drupal\search_api_solr\Controller\DevelController, which will show the document object(s) indexed in Solr for that entity.

DevelController uses kprint_r() to dump the document object(s), but that function was removed in Make dpm() and friends pluggable (with Krumo, Kint, Ladybug etc). Thus, you'll get a white page (at least) in the latest Devel release (8.x-1.0-rc1) when accessing the tab.

STR

• Make sure, that devel module is installed.
• Click on the Devel tab for an indexed entity.
• Click on the Solr tab (e.g. /devel/node/1234/solr).

Expected result

Dumped document object(s) for entity.

Actual result

White page with error message:

Error: Call to undefined function Drupal\search_api_solr\Controller\kprint_r() in Drupal\search_api_solr\Controller\DevelController->entitySolr() (line 133 of modules/contrib/search_api_solr/src/Controller/DevelController.php).

Proposed resolution

Use \Drupal\devel\DevelDumperManager to dump the object(s).