Serialization of groups in entry

[tobiasdiez]

Currently the manual groups are written to the bib file as a jabref comment at the end of the file. I was thinking about changing this to an inline serialization similar to the keywords fields. That is, as groups={mygroup1, mygroup2} in the entry.

This would have the following advantages:

• One could easily see the groups an entry belongs to and could change them by hand. Related SF 868 and SF 750
• The group information is accessible in latex (very easy with biblatex).
• Copying an entry to different db keeps group assignment (if group exists in new db). Related SF 756
• Allows to search for group memberships in the search bar (would solve SF 681).
• The logic for filtering by groups can be completely replaced by the search functionality.
• It would work also for entries without bibkey (ok not a big achievement) and there is no logic required if the bibkey is changed (but the very same code is required for group renames).

But since there were quite a few discussions recently about how to serialize the database I want to asked about your opinions before investigating time into this :).

[koppor]

My first thought: This contradicts #574. I always have sharing in mind. On the one hand, when sending a bibtex entry, I don't want to send internal fields such das __markedentry. On the other hand, data such as groups or keywords belong to an entry and are not external to it.

Maybe, we have to add a functionality "copy entry without personal data to the clipboard".

[koppor]

Refs #628

[lenhard]

Implemented by #1276