Not possible to share contacts or contact groups with other users

[krafel]

Describe the bug

It is not possible to share a specific contact or contact groups with other users of the nextcloud instance. The only way is

• to share a address book
• to export a contact and import it as the other user as vcf

Background:
Sharing contacts by address books is not enough. If I don't want to share a whole address book with other members of my nextcloud instance (e.g. business partners) I have to either clone the entry into another adress book and share that (but then I have two entries of the same contact. Difficult to maintain, when the contact's details change!).

The basic problem is that one single contact can be member of many groups, but of only one adress book. And contacts from different address books can be in one group. This would be very helpful to create a set of contacts from various address books that you'd like to share.

Steps to reproduce

1. Go to a contact
2. Click on '....'
3. There is no option to share the contact

Expected behavior

Implemented functionality to share single contacts or contact groups

Actual behavior

Sharing not possible but via address books.

Contact version

No response

Operating system

No response

PHP engine version

None

Web server

None

Database

None

Additional info

No response

[ChristophWurst]

nextcloud/contacts version please

[joshtrichards]

Duplicate of #111