Issue #3332877 by claudiu.cristea, xjm, penyaskito, alexpott: Added...

Issue #3332877 by claudiu.cristea, xjm, penyaskito, alexpott: Added TermForm::getParentIds for allowing to override in contrib

core/modules/taxonomy/src/TermForm.php

@@ -23,12 +23,7 @@ public function form(array $form, FormStateInterface $form_state) {
     $taxonomy_storage = $this->entityTypeManager->getStorage('taxonomy_term');
     $vocabulary = $vocab_storage->load($term->bundle());
 
-    $parent = [];
-    // Get the parent directly from the term as
-    // \Drupal\taxonomy\TermStorageInterface::loadParents() excludes the root.
-    foreach ($term->get('parent') as $item) {
-      $parent[] = (int) $item->target_id;
-    }
+    $parent = $this->getParentIds($term);
     $form_state->set(['taxonomy', 'parent'], $parent);
     $form_state->set(['taxonomy', 'vocabulary'], $vocabulary);
 
@@ -219,4 +214,23 @@ public function save(array $form, FormStateInterface $form_state) {
     $form_state->set('tid', $term->id());
   }
 
+  /**
+   * Returns term parent IDs, including the root.
+   *
+   * @param \Drupal\taxonomy\TermInterface $term
+   *   The taxonomy term entity.
+   *
+   * @return array
+   *   A list if parent term IDs.
+   */
+  protected function getParentIds(TermInterface $term): array {
+    $parent = [];
+    // Get the parent directly from the term as
+    // \Drupal\taxonomy\TermStorageInterface::loadParents() excludes the root.
+    foreach ($term->get('parent') as $item) {
+      $parent[] = (int) $item->target_id;
+    }
+    return $parent;
+  }
+
 }