hotline #28796 fix duplicate entries for dynamic facets when label size is more than 20 characters

cosmogramme/tests/php/classes/KohaRecordIntegrationTest.php

@@ -213,7 +213,7 @@ class KohaRecordIntegrationVagabondWithThesaurusOn702DollarATest extends KohaRec
                    ['id' => 5,
                     'libelle' => 'd\'après l\'oeuvre d\'Eiji Yoshikawa, "Miyamoto Musashi"',
                     'id_thesaurus' => 'SUMM0001',
-                    'id_origine' => 'D\'APRèS L\'OEUVRE D\'',
+                    'id_origine' => 'D\'APRèS L\'OEUVRE D\'E',
                     'code' => 'summary'
                    ]);
 

library/Class/CodifThesaurus.php

@@ -243,8 +243,9 @@ class Class_CodifThesaurus extends Storm_Model_Abstract {
 
 
   public function getOrCreateChild($id_origine, $label) {
-    if (!$entry = $this->getLoader()->findFirstBy(['code' => $this->getCode(),
-                                                   'id_origine' => substr($id_origine, 0, self::COLUMN_ORIGIN_SIZE)])) {
+    if (!$entry = $this->getLoader()
+        ->findFirstBy(['code' => $this->getCode(),
+                       'id_origine' => mb_substr($id_origine, 0, self::COLUMN_ORIGIN_SIZE, 'UTF-8')])) {
       $entry = $this
         ->newChildEntry()
         ->updateAttributes(['id_origine' => $id_origine,