Merge branch '6.4' into 7.4

* 6.4:
  [Ldap] Make the Adapter resettable
  [Serializer] Remove needless line in changelog
  [MonologBridge] Fix ConsoleHandler losing output after nested command terminates
  [Cache] Fix tests
  [EventDispatcher] Fix memory leak in TraceableEventDispatcher for long-running processes
  [TwigBridge][Mime] Add missing tests
  [TwigBridge] Refactor image method to use DataPart content ID
  [Cache] Fix undefined property access
  [Console] Fix performance regression in OutputFormatter for ASCII content
  [Serializer] Fix can*() prefix support in GetSetMethodNormalizer
  [Cache] Fix Psr16Cache::getMultiple() returning ValueWrapper with TagAwareAdapter

# Conflicts:
#	src/Symfony/Bridge/Monolog/Handler/ConsoleHandler.php
#	src/Symfony/Bridge/Monolog/Tests/Handler/ConsoleHandlerTest.php
#	src/Symfony/Bridge/Twig/Mime/WrappedTemplatedEmail.php
#	src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
#	src/Symfony/Component/Ldap/Tests/Adapter/ExtLdap/AdapterTest.php

Author: nicolas-grekas

Formatter/OutputFormatter.php

@@ -123,6 +123,10 @@ public function formatAndWrap(?string $message, int $width): string
             return '';
         }
 
+        // For ASCII-only strings, byte positions equal character positions,
+        // so we can use native strlen/substr which is much faster than Helper::length/substr.
+        $isAscii = !preg_match('/[\x80-\xFF]/', $message);
+
         $offset = 0;
         $output = '';
         $openTagRegex = '[a-z](?:[^\\\\<>]*+ | \\\\.)*';
@@ -137,11 +141,17 @@ public function formatAndWrap(?string $message, int $width): string
                 continue;
             }
 
-            // convert byte position to character position.
-            $pos = Helper::length(substr($message, 0, $pos));
-            // add the text up to the next tag
-            $output .= $this->applyCurrentStyle(Helper::substr($message, $offset, $pos - $offset), $output, $width, $currentLineLength);
-            $offset = $pos + Helper::length($text);
+            if ($isAscii) {
+                // For ASCII, byte position = character position, no conversion needed
+                $output .= $this->applyCurrentStyle(substr($message, $offset, $pos - $offset), $output, $width, $currentLineLength);
+                $offset = $pos + \strlen($text);
+            } else {
+                // convert byte position to character position.
+                $pos = Helper::length(substr($message, 0, $pos));
+                // add the text up to the next tag
+                $output .= $this->applyCurrentStyle(Helper::substr($message, $offset, $pos - $offset), $output, $width, $currentLineLength);
+                $offset = $pos + Helper::length($text);
+            }
 
             // opening tag?
             if ($open = '/' !== $text[1]) {
@@ -162,7 +172,7 @@ public function formatAndWrap(?string $message, int $width): string
             }
         }
 
-        $output .= $this->applyCurrentStyle(Helper::substr($message, $offset), $output, $width, $currentLineLength);
+        $output .= $this->applyCurrentStyle($isAscii ? substr($message, $offset) : Helper::substr($message, $offset), $output, $width, $currentLineLength);
 
         return strtr($output, ["\0" => '\\', '\\<' => '<', '\\>' => '>']);
     }