bug#66675: 29.1; Gnus hangs on startup fetching new news

[Eli Zaretskii]

> From: "Doolittle, Edward" <edoolittle@firstnationsuniversity.ca>
> Date: Sat, 21 Oct 2023 21:37:20 +0000
> 
> Gnus worked very well for me until I decided to try Gnus Cloud to
> synchronize news between two computers.  I set up nnimap to point to my
> iCloud mail imap account, started reading mail in Gnus, then set up the
> Gnus cloud repository there.  Everything worked as expected.  I quit
> Gnus multiple times and restarted and everything worked as expected.
> 
> Then I quit emacs and restarted a few hours later, and found that Gnus
> would hang on startup while checking for new news.  I removed the nnimap
> lines from init.el and restarted emacs, but it still hanged.  I touched
> .newsrc and Gnus started.  I conclude that there is a problem with
> .newsrc.eld but I don't understand the format well enough to do surgery
> on it.  My theory is that maybe there is some kind of security feature on
> iCloud mail that is not allowing Gnus access after a time.
> 
> For now I'm deactivating nnimap and restoring .newsrc.eld from backup
> which should get me back to normal, but I would appreciate any guidance
> you may have using Gnus cloud with iCloud.

Eric and Andrew, could you please look into this?