[Process] Non ASCII characters disappearing during the escapeshellarg

src/Symfony/Component/Process/ProcessUtils.php

@@ -71,7 +71,7 @@ class ProcessUtils
             return $escapedArgument;
         }
 
-        return escapeshellarg($argument);
+        return "'".str_replace("'", "'\\''", $argument)."'";
     }
 
     /**

src/Symfony/Component/Process/Tests/ProcessUtilsTest.php

@@ -43,6 +43,7 @@ class ProcessUtilsTest extends \PHPUnit_Framework_TestCase
             array("'<|>\" \"'\\''f'", '<|>" "\'f'),
             array("''", ''),
             array("'with\\trailingbs\\'", 'with\trailingbs\\'),
+            array("'withNonAsciiAccentLikeéÉèÈàÀöä'", 'withNonAsciiAccentLikeéÉèÈàÀöä'),
         );
     }
 }