iOS with IMAP backend. Lopping with Char °

[Minims]

Hi,

I'm using last version from your gitHub repo.
When i reveive an email with '°' char in subject, message is looping :

"Mobile loop detected! Messages sent to the mobile will be restricted to 2 items in order to identify the conflict"

I've tried this without success :
define('IMAP_MBCONVERT', "UTF-16, UTF-8, ISO-8859-15, ISO-8859-1, Windows-1252");

The mail has : Content-type: text/html; charset=ISO-8859-1
if i replace the char in the email received, it works.

I've tried with : Content-Type: text/plain; charset=US-ASCII; and in this case it's OK.

Any idea ?

Thanks :)