Issue #2454733 followup by amateescu: Add a user-space case-insensitive...

Issue #2454733 followup by amateescu: Add a user-space case-insensitive collation to the SQLite driver

core/lib/Drupal/Component/Utility/Unicode.php

@@ -553,8 +553,8 @@ public static function truncate($string, $max_length, $wordsafe = FALSE, $add_el
    *   Returns < 0 if $str1 is less than $str2; > 0 if $str1 is greater than
    *   $str2, and 0 if they are equal.
    */
-  public static function strCaseCmp($str1 , $str2) {
-    return strcmp(mb_strtoupper($str1, 'utf-8'), mb_strtoupper($str2, 'utf-8'));
+  public static function strcasecmp($str1 , $str2) {
+    return strcmp(static::strtoupper($str1), static::strtoupper($str2));
   }
 
   /**

core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php

@@ -125,7 +125,7 @@ public static function open(array &$connection_options = array()) {
     $pdo->sqliteCreateFunction('regexp', array(__CLASS__, 'sqlFunctionRegexp'));
 
     // Create a user-space case-insensitive collation with UTF-8 support.
-    $pdo->sqliteCreateCollation('NOCASE_UTF8', array('Drupal\Component\Utility\Unicode', 'strCaseCmp'));
+    $pdo->sqliteCreateCollation('NOCASE_UTF8', array('Drupal\Component\Utility\Unicode', 'strcasecmp'));
 
     // Execute sqlite init_commands.
     if (isset($connection_options['init_commands'])) {