Re: double download of attachments?

[Simon Josefsson <jas@extundo.com>]

dme@dme.org writes:

> * jas@extundo.com [2002-11-15 15:30:41]
>> OTOH sometimes when I enter groups with large messages, the summary
>> buffer doesn't match the article buffer contents sometimes, and I have
>> been suspecting the backlog and/or asynchronous prefetching for that
>> (but never been able to track down exactly what is happening).
>> <optimist>Maybe if we enable the backlog by default, people will see
>> the bug and fix it.</optimist>
>
> I've seen this.  I disabled the backlog, and it didn't go away.

I'm now able to reproduce it (it is easy to reproduce if you have some
large articles in the group that is prefetched early on). The cache,
agent or backlog is not the cause, it seems to be caused by the asynch
prefetch alone.  The agent, cache and backlog only indirectly worsen
the bug, since it makes the errorenous article stay around after the
asynch prefetch received the incorrect article.  When the agent, cache
and backlog is disabled, the asynch article is incorrect when you
first select it, but it is removed from the asynch cache when it is
read so if you select the article again the correct article is
downloaded.

I'll try to track it down further...

In any case, I think we should enable the backlog by default.