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Subject: nnrss lacks basic crosspost detection; should use guid
Date: Sat, 28 Feb 2009 04:53:14 +0800
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Alas,
http://www.coolloud.org.tw/tag/=E6=96=B0=E7=A7=BB=E6=B0=91/feed
http://www.coolloud.org.tw/tag/=E7=A7=BB=E6=B0=91=E5=B7=A5/feed
have the same item,
<guid isPermaLink=3D"false">35873 at http://www.coolloud.org.tw</guid>
with the same date even, but nnrss is not smart enough to mark it read
globally if read in one group.
Part of the problem is that nnrss totally ignores the guid, and
instead insists on making its own Message-IDs,
Message-ID: <828@=3D?utf-8?B?6KiC6Zax6Ium5YueX+enu+awkeW3pV/nmoTmlofnq6A=3D=
?=3D.nnrss>
Message-ID: <73@=3D?utf-8?B?6KiC6Zax6Ium5YueX+aWsOenu+awkV/nmoTmlofnq6A=3D=
?=3D.nnrss>
Decoding, <828@=E8=A8=82=E9=96=B1=E8=8B=A6=E5=8B=9E_=E7=A7=BB=E6=B0=91=E5=
=B7=A5_=E7=9A=84=E6=96=87.nnrss>, we see the encoded part
was merely the group description.

If the Message-ID just used the guid, perhaps crossposts could be
detected, and marked as read globally. Only if there is no guid, then
fall back to the current scheme.