Symfony version(s) affected: symfony/mime (all versions)

Description
The class Symfony\Component\Mime\MimeTypes contains a mapping from mime type to possible extensions. This mapping is derived from https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types. For image/jpeg and image/pjpeg the extensions are 'jpeg', 'jpg', 'jpe'.

The method guessExtension() of Symfony\Component\HttpFoundation\File\File uses this map to find extensions for mime types. For image/jpeg, it returns jpeg because that is the first one in the list, even though jpg is a much more common extension.

How to reproduce

<?php
$file = new Symfony\Component\HttpFoundation\File\File('somefile.jpg');
$ext = $file->guessExtension();

// $ext is 'jpeg'
?>

Possible Solution

I propose that update_mime_types.php is updated such that it writes 'jpg', 'jpeg', 'jpe' to MimeTypes.php to have guessExtension() return jpg instead of jpeg.