Plugin show_additional_header no mime decode header

[lefoyer]

If i use show_additional_header plugin, and add header included text in rfc2047 format, sample:
X-Spam-Message: =?UTF-8?Q?HELO=3D=5BTFLSKRMQ=5D_=D0=BD=D0=B5_=D1=81=D0=BE=D0=B4=D0=B5=D1?=

show_additional_header not decode this message, and show unmodifed message

patch: file rcube_imap_generic.php or in github rev 9ad08104 = rcube_message_header.php

class rcube_mail_header //or in github rev 9ad08104 = class rcube_message_header
+    private $mime;


    public function get($name)
    {
        $name = strtolower($name);

+        $this->mime = new rcube_mime($this->charset);

        if (isset($this->obj_headers[$name])) {
-            return $this->{$this->obj_headers[$name]};
+            return $this->{$this->mime->decode_header($this->obj_headers[$name])};
        }

-        return $this->others[$name];
+        return $this->mime->decode_header($this->others[$name]);
    }

[lefoyer]

in git branch master too

[alec]

Fixed in 0f5dee00, eede5101 (master) and 0e582116 (release-0.8).