Bugfix with decode_mime_string(From/To) in Changeset 1355

[Javer]

Changeset 1355, which add decode_mime_string around From and To fields of messages, is incorrect, and now From and To fields in messages list are displayed incorrectly. This is because processing of From/To fields looks like this:

$input = rcube_imap::decode_mime_string($input)
rcmail_address_string($input)
|-> $IMAP->decode_address_list($input)
    |-> $IMAP->_parse_address_list($input, true)
        |-> $IMAP->decode_header($input)
            |-> rcube_imap::decode_mime_string($input)

Therefore, we have double using of decode_mime_string on same input value, and result value is wrong.

---

Solution: Remove call rcube_imap::decode_mime_string when processing From and To fields in messages list. In attached patch also added IMAP->set_charset() for using correct message charset when calling decode_mime_string() while processing rcmail_address_string().

[Javer]

Cleaned patch (set_charset moved to separate patch)

[alec]

Fixed in r1366.