bug#53638: [PATCH] newsticker better path handling and data storage

[Robert Pluim]

>>>>> On Sun, 30 Jan 2022 19:47:03 +0000, mailj2--- via "Bug reports for GNU 
>>>>> Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> said:

    mailj2> The way newsticker currently handles paths involves directly 
concating
    mailj2> "/", which only works for UNIX systems.

emacs-28 has `file-name-concat' for this very purpose, perhaps you
could respin to use that instead.

    mailj2> Additionally, since newsticker uses `prin1-to-string' for storing
    mailj2> groups and cache, it should be enforced that `print-level' and
    mailj2> `print-length' are set to nil for the operation just as a 
precaution (it
    mailj2> happened to me that I manually set these once, which resulted in the
    mailj2> newsticker cache being corrupted).

OK. It would be good to have a ChangeLog style commit message as well,
see CONTRIBUTE for details. 'C-x 4 a' can help with writing it.

Robert
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