Resolve #2423093 "Allow multiple target"

Closes #2423093

core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php

@@ -10,6 +10,8 @@
 use Drupal\Core\Field\WidgetBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\link\LinkItemInterface;
+use Drupal\node\Entity\Node;
+use Drupal\taxonomy\Entity\Term;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationListInterface;
 
@@ -75,7 +77,7 @@ protected static function getUriAsDisplayableString($uri) {
       // Show the 'entity:' URI as the entity autocomplete would.
       // @todo Support entity types other than 'node'. Will be fixed in
       //   https://www.drupal.org/node/2423093.
-      if ($entity_type == 'node' && $entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($entity_id)) {
+      if (in_array($entity_type, ['node', 'taxonomy_term']) && $entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($entity_id)) {
         $displayable_string = EntityAutocomplete::getEntityLabels([$entity]);
       }
     }
@@ -97,13 +99,15 @@ protected static function getUriAsDisplayableString($uri) {
    *
    * @param string $string
    *   The user-entered string.
+   * @param string $langcode
+   *   The langcode.
    *
    * @return string
    *   The URI, if a non-empty $uri was passed.
    *
    * @see static::getUriAsDisplayableString()
    */
-  protected static function getUserEnteredStringAsUri($string) {
+  protected static function getUserEnteredStringAsUri($string, $langcode = NULL) {
     // By default, assume the entered string is a URI.
     $uri = trim($string);
 
@@ -113,6 +117,17 @@ protected static function getUserEnteredStringAsUri($string) {
       // @todo Support entity types other than 'node'. Will be fixed in
       //   https://www.drupal.org/node/2423093.
       $uri = 'entity:node/' . $entity_id;
+      $node = Node::load($entity_id);
+      // On layout builder pages, the langcode is not passed.
+      if (is_null($langcode) && str_contains(\Drupal::routeMatch()->getRouteName(), 'layout_builder')) {
+        $langcode = \Drupal::languageManager()->getCurrentLanguage()->getId();
+      }
+      if ($node && isset($langcode) && $node->isTranslatable() && $node->hasTranslation($langcode)) {
+        $node = $node->getTranslation($langcode);
+      }
+      if (!$node || (!str_contains($string, $node->label()) && Term::load($entity_id) !== NULL)) {
+        $uri = 'entity:taxonomy_term/' . $entity_id;
+      }
     }
     // Support linking to nothing.
     elseif (in_array($string, ['<nolink>', '<none>', '<button>'], TRUE)) {
@@ -139,7 +154,7 @@ protected static function getUserEnteredStringAsUri($string) {
    * Disallows saving inaccessible or untrusted URLs.
    */
   public static function validateUriElement($element, FormStateInterface $form_state, $form) {
-    $uri = static::getUserEnteredStringAsUri($element['#value']);
+    $uri = static::getUserEnteredStringAsUri($element['#value'], $form_state->get('langcode'));
     $form_state->setValueForElement($element, $uri);
 
     // If getUserEnteredStringAsUri() mapped the entered value to an 'internal:'
@@ -215,9 +230,9 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     // 'url' form element and we have to do the validation ourselves.
     if ($this->supportsInternalLinks()) {
       $element['uri']['#type'] = 'entity_autocomplete';
-      // @todo The user should be able to select an entity type. Will be fixed
-      //   in https://www.drupal.org/node/2423093.
-      $element['uri']['#target_type'] = 'node';
+      // Dirty hack around https://www.drupal.org/node/2423093
+      // @todo: remove when the issue is fixed.
+      $element['uri']['#target_type'] = 'node,taxonomy_term';
       // Disable autocompletion when the first character is '/', '#' or '?'.
       $element['uri']['#attributes']['data-autocomplete-first-character-denylist'] = '/#?';