generated dates should not be hashed (was: duplicate items in nnrss groups)

["Jochen Küpper" <jochen-+It19tn3Rl9sbm7dSapR3bNAH6kLmebB@public.gmane.org>]

Ok, I think I have spotted the problem with the duplicate entries I
encounter in nnrss feeds:

For the feeds without a date specified, in nnrss-normalize-date the
,----
|     (cond ((null date))
`----
case is true. Therefore, at the end of that function 
,----
| message-make-date
`----
is called to create a valid date. Therefore, every time when running
nnrss-check-group the current date is used. On successive hashing of
the item, it is changed form the last update due to the new date.

Therefore I would suggest that the date should not be used in creating
the item hash, or at least it should be configurable to do so.

Or is there a better way of dealing with the problem?

Greetings,
Jochen
-- 
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