bug#20159: 24.4; url-retrieve invokes same callback twice with kill-buffer

[Andy Moreton <andrewjmoreton@gmail.com>]

On Sat 28 Mar 2015, Eli Zaretskii wrote:

>> Date: Fri, 27 Mar 2015 22:40:19 +0300
>> From: Eli Zaretskii <eliz@gnu.org>
>> Cc: 20159@debbugs.gnu.org
>> 
>> > > This change broke gnus for me on a mingw64 x64 build of emacs, as gnutls
>> > > seems unable to connect to the NNTP server at gmane.org.
>> > 
>> > Sorry about that.  Does Gnus do something windows-specific for
>> > connecting?  Perhaps that specific treatment relied on something that
>> > is no longer true on Windows.
>> 
>> Another, perhaps more probable culprit is the emacs_gnutls_pull
>> function.  It calls sys_read, where I made some changes to support the
>> non-blocking connect.  Perhaps emacs_gnutls_pull cannot cope with some
>> results of those changes, and itself needs to be amended.
>
> I found and fixed a stupid mistake in sys_connect that broke blocking
> connects.  Before I fixed it, "M-x eww" wouldn't work; now it does,
> including with HTTPS URLs that require GnuTLS.  Please see if this
> also fixes your problem with Gnus and GnuTLS connections to NNTP
> servers.

Thanks Eli, gnus is working again for me.

    AndyM