bug#33005: 27.0.50; Data loss with Gnus registry

[Michael Heerdegen]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> Well damn. And we're coming up on Emacs 27.1, too... I've never seen
> this before -- would you mind sending all your registry-related config
> (off-list, if necessary), and anything else you might think is relevant,
> and I'll try to reproduce?

Ok, I debugged it.  FWIW I recently learned that "I'll try to reproduce"
has a meaning that I didn't expect: you need to say "I'll try to
reproduce it" or else Stallman might show up and laugh at you (it
happened to me).

Ok: I have only (gnus-registry-initialize) in my init file.  And this is
already broken:

"gnus-registry.el" initializes gnus-registry-db like this:

  (defvar gnus-registry-db (gnus-registry-make-db)
    "The article registry by Message ID.  See `registry-db'.")

and in `gnus-registry-load' the

  (null (eieio-object-p gnus-registry-db))

always fails so unless you call `gnus-registry-load' with the force arg
you always start with an empty db.

Michael.