Merge branch '3494949-2.0.0-rc1-allow-identifier' into '2.0.x'

Resolve #3494949 "2.0.0 rc1 allow identifier"

See merge request !307

src/Plugin/UiPatterns/PropType/IdentifierPropType.php

@@ -19,6 +19,7 @@ use Drupal\ui_patterns\PropTypePluginBase;
   label: new TranslatableMarkup('Identifier'),
   description: new TranslatableMarkup('A string with restricted characters, suitable for an HTML ID.'),
   default_source: 'textfield',
+  convert_from: ['string'],
   schema: ['type' => 'string', 'pattern' => '(?:--|-?[A-Za-z_\x{00A0}-\x{10FFFF}])[A-Za-z0-9-_\x{00A0}-\x{10FFFF}\.]*'],
   priority: 100
 )]
@@ -33,4 +34,13 @@ class IdentifierPropType extends PropTypePluginBase {
     return strip_tags(static::convertToString($value));
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function convertFrom(string $prop_type, mixed $value): mixed {
+    return match ($prop_type) {
+      'string' => (string) $value,
+    };
+  }
+
 }