Issue #3175759 by chr.fritsch, daniel.bosen: Support autocreation for views selection

src/Plugin/Field/FieldWidget/Select2EntityReferenceWidget.php

@@ -253,27 +253,29 @@ protected static function prepareFieldValues(array $values, array $element) {
   protected function getAutocreateBundle() {
     $bundle = NULL;
     if ($this->getSelectionHandlerSetting('auto_create')) {
-      if ($target_bundles = $this->getSelectionHandlerSetting('target_bundles')) {
-        // If there's only one target bundle, use it.
-        if (count($target_bundles) == 1) {
-          $bundle = reset($target_bundles);
-        }
-        // Otherwise use the target bundle stored in selection handler settings.
-        elseif (!$bundle = $this->getSelectionHandlerSetting('auto_create_bundle')) {
-          // If no bundle has been set as auto create target means that there is
-          // an inconsistency in entity reference field settings.
-          trigger_error(sprintf(
-            "The 'Create referenced entities if they don't already exist' option is enabled but a specific destination bundle is not set. You should re-visit and fix the settings of the '%s' (%s) field.",
-            $this->fieldDefinition->getLabel(),
-            $this->fieldDefinition->getName()
-          ), E_USER_WARNING);
-        }
+      // If a bundle is explicitly defined, use it.
+      if ($bundle = $this->getSelectionHandlerSetting('auto_create_bundle')) {
+        return $bundle;
+      }
+
+      $target_bundles = $this->getSelectionHandlerSetting('target_bundles');
+      // If there's no target bundle at all, use the target_type. It's the
+      // default for bundleless entity types.
+      if (empty($target_bundles)) {
+        $bundle = $this->getFieldSetting('target_type');
+      }
+      // If there's only one target bundle, use it.
+      elseif (count($target_bundles) == 1) {
+        $bundle = reset($target_bundles);
       }
       else {
-        $entity_definition = $this->entityTypeManager->getDefinition($this->getFieldSetting('target_type'));
-        if (!$entity_definition->getBundleEntityType()) {
-          $bundle = $this->getFieldSetting('target_type');
-        }
+        // If no bundle has been set as auto create target means that there is
+        // an inconsistency in entity reference field settings.
+        trigger_error(sprintf(
+          "The 'Create referenced entities if they don't already exist' option is enabled but a specific destination bundle is not set. You should re-visit and fix the settings of the '%s' (%s) field.",
+          $this->fieldDefinition->getLabel(),
+          $this->fieldDefinition->getName()
+        ), E_USER_WARNING);
       }
     }