[Bug 251767] wcswidth() from libc reports wrong string lenght (no unicode 9 support)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251767

            Bug ID: 251767
           Summary: wcswidth() from libc reports wrong string lenght (no
                    unicode 9 support)
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: dmilith at me.com

Basically any emoji character from UTF-8 like "👌" is incorrectly reported as
length "1" by wcswidth(const wchar_t *pwcs, size_t n);

Seems like libc in FreeBSD supports older version of Unicode standard than 9?

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