Bug in gnutls breaking Pidgin Jabber support

[Nikos Mavrogiannopoulos]

Tim Kosse wrote:
> Hi,
> 
> found the problem. Happens if _gnutls_io_write_buffered gets called with
> iptr == NULL and n < session->internals.record_send_buffer.length
> 
> It then gets up to n bytes from the send buffer into ptr. At that point
> session->internals.record_send_buffer still contains additional
> outstanding data.
> 
> If sending fails, it pushes the remaining data from ptr to the end of
> the send buffer, causing the buffer contents to become reordered.
> Instead it should have put it to the beginning. A gnutls_buffer_prepend
> function would be needed.
> 
> A workaround is to always request the complete buffer, see attached
> patch. That's identical to the behavior of older GnuTLS versions.

I did a quick hack to make a prepend function. Does this solve the issue?
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