Double sharee match when restrict sharee listing to group is activated

[wiswedel]

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Steps to reproduce

1. Users Simon and Henri are in group Marketing (and no other groups)
2. User Peter is in group Sales (and no other groups)
3. Sharing setting Restrict username autocompletion to users within the same groups is activated
4. Simon wants to share a file or folder with Henri
5. Simon enters "Henri" in the sharing text field

Expected behaviour

Henri appears once as sharee.

Actual behaviour

Henri appears twice as sharee.

Side notes

• only happens when the above mentioned restriction setting is activated
• does not happen for exact username matches of users from non-common groups

Server configuration

NC 19.0.0 RC3