bug#42497: 28.0.50; gnus: re-entering a group after gnus-group-get-new-news

[Sam Steingold]

Start gnus.
Select a group X (gnus-group-select-group) with, say, 5 unread articles
- get to the *Summary X* buffer.
Switch back to *Group* buffer.
Wait and hit g (gnus-group-get-new-news) repeatedly until X has more
than 5 new articles (say, 7).
Select X again (gnus-group-select-group) - you get the old *Summary X*
buffer with 5 unread articles - not the 7.
This behavior is understandable but not necessarily desirable.


In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin19.6.0, NS appkit-1894.60 
Version 10.15.6 (Build 19G73))
 of 2020-07-20 built on BZ-C02XR5CGJG5L
Repository revision: fe2d0ede2874a5411d14e1cad3d72883823719c1
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1894
System Description:  Mac OS X 10.15.6

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