[Bug 238995] adduser does not check for pre-existing user field entries in /etc/group

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238995

--- Comment #9 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=3532d9c66ecefd356ec670f014e4647537b59ef1

commit 3532d9c66ecefd356ec670f014e4647537b59ef1
Author:     Naman Sood <mail@nsood.in>
AuthorDate: 2023-07-19 12:44:21 +0000
Commit:     Dag-Erling Smørgrav <des@FreeBSD.org>
CommitDate: 2024-05-09 11:04:30 +0000

    pw: Ensure group membership is not duplicated

    Fix the following problem:

    1. A nonexistent user, someuser, is added to somegroup in /etc/group.
    2. someuser is then created with membership in somegroup.

    The entry for somegroup in /etc/group will then contain

        somegroup:*:12345:someuser,someuser

    With this fix, the entry will be

        somegroup:*:12345:someuser

    PR:             238995
    Reviewed by:    bapt, jrm
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D41076

    (cherry picked from commit 17839f45d86e79065a65ad3e2522dd69b29a652c)

 usr.sbin/pw/pw.h       | 2 ++
 usr.sbin/pw/pw_group.c | 2 +-
 usr.sbin/pw/pw_user.c  | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

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