>>>>> Reiner Steib wrote:

> I see more an more incorrectly encoded subjects like this:

> ,----
>| Subject: =?ISO-8859-1?Q?bequeme_Index-Eintr=E4ge_mit_TexnicCenter??=
>| Organization: http://groups.google.com
>| Message-ID: <78a8858d-463a-4a24-b18c-d0579ef60be9@s19g2000prg.googlegroups.com>
>| User-Agent: G2/1.0
> `----

> The mistake on Google's side is not to encode the (trailing) question
> mark.  How can we make Gnus' decoder more liberal?

Maybe the patch below does it but we must check it thoroughly.
Would we be able to make complete test cases?

(rfc2047-decode-string "=?ISO-8859-1?Q??foo?=")
"?foo"
(rfc2047-decode-string "=?ISO-8859-1?Q?=foo?=")
"=foo"
(rfc2047-decode-string "=?ISO-8859-1?Q?foo??=")
"foo?"
(rfc2047-decode-string "=?ISO-8859-1?Q?foo?=?=")
"foo?="
(rfc2047-decode-string "=?ISO-8859-1?Q?foo?==?ISO-8859-1?Q?bar?=")
"foobar"
...