[Bug 255646] newlocale(LC_ALL_MASK, (locale_t) 0) wrongly destroys LC_COLLATE in an existing object

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255646

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=269dea90d6eb32690730b0f6a17fb41170483104

commit 269dea90d6eb32690730b0f6a17fb41170483104
Author:     Yuri Pankov <yuripv@FreeBSD.org>
AuthorDate: 2023-03-28 15:10:47 +0000
Commit:     Yuri Pankov <yuripv@FreeBSD.org>
CommitDate: 2023-03-28 15:16:30 +0000

    libc: use separate collate objects for C, POSIX, and C.UTF-8

    Fix newlocale() overwriting the locale name in collate object
    when same instance was used for those locales, and querylocale()
    reporting unexpected value for LC_COLLATE_MASK.

    PR:             255646, 269375
    Reviewed by:    markj, bapt (previous version)
    Differential Revision:  https://reviews.freebsd.org/D30146

 lib/libc/locale/collate.c                    |  17 +++-
 lib/libc/tests/locale/Makefile               |   1 +
 lib/libc/tests/locale/newlocale_test.c (new) | 111 +++++++++++++++++++++++++++
 3 files changed, 126 insertions(+), 3 deletions(-)

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