bug#33005: 27.0.50; Data loss with Gnus registry

[Michael Heerdegen]

Hello,

I want to use the Gnus registry to use registry marks and store data as
described in (info "(gnus) Store arbitrary data").  Very often, these
things vanish after restarting Emacs or Gnus.

For example, I use M M i to mark some article "Important".  I have
configured `gnus-summary-line-format' to show registry marks.  Often,
after restarting, the mark is gone.  Likewise, data stored with
`gnus-registry-set-id-key' gets lost, even when the according article
has a registry mark attached.

[BTW, there is a typo in (info "(gnus) Store arbitrary data").  It says
`gnus-registry-extra-entries-precious' would default to (marks) but it
defaults to (mark)]

My final goal is to implement a little Gnu Elpa package
"gnus-article-notes.el" that can be used to attach little text notes to
arbitrary articles.  The package is already done, if you are interested,
I can send you the code.  I have verified that registry marks get lost
independently of that package.  I guess there is something wrong with
registry pruning.  CC'ing Eric Abrahamsen who has recently worked in
this area.


TIA,

Michael.




In GNU Emacs 27.0.50 (build 14, x86_64-pc-linux-gnu, GTK+ Version 3.24.1)
 of 2018-10-10 built on drachen
Repository revision: db1daee25ae82cdd1e0b7a8f50fa55003f31cf67
Windowing system distributor 'The X.Org Foundation', version 11.0.12001000
System Description: Debian GNU/Linux buster/sid

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS GLIB NOTIFY
GNUTLS LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM
THREADS JSON LCMS2 GMP