Fix so attachment charset is set in headers of forward/draft message (#1490109)

CHANGELOG

@@ -49,6 +49,7 @@ CHANGELOG Roundcube Webmail
 - Don't remove links when html signature is converted to text (#1489621)
 - Fix page title when using search filter (#1490023)
 - Fix mbox files import
+- Fix so attachment charset is set in headers of forward/draft message (#1490109)
 - Fix bug where wrong charset could be used for text attachment preview page (#1490106)
 - Fix setting flags on servers with no PERMANENTFLAGS response (#1490087)
 - Fix regression in SHAA password generation in ldap driver of password plugin (#1490094)

program/steps/mail/compose.inc

@@ -1377,6 +1377,7 @@ function rcmail_save_attachment(&$message, $pid)
         'data'       => $data,
         'path'       => $path,
         'size'       => $path ? filesize($path) : strlen($data),
+        'charset'    => $part->charset,
     );
 
     $attachment = $rcmail->plugins->exec_hook('attachment_save', $attachment);

program/steps/mail/sendmail.inc

@@ -469,7 +469,8 @@ if (is_array($COMPOSE['attachments'])) {
                 $attachment['data'] ? false : true,
                 $ctype == 'message/rfc822' ? '8bit' : 'base64',
                 'attachment',
-                '', '', '',
+                $attachment['charset'],
+                '', '',
                 $folding ? 'quoted-printable' : NULL,
                 $folding == 2 ? 'quoted-printable' : NULL,
                 '', RCUBE_CHARSET