Issue #3453922 "Entityreference::fieldSettingsForm() should sort the $handlers_options"

Closes #3453922

core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php

@@ -458,6 +458,9 @@ public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
       }
     }
 
+    // Sort the handlers options.
+    natcasesort($handlers_options);
+
     $form = [
       '#type' => 'container',
       '#process' => [[static::class, 'fieldSettingsAjaxProcess']],