[Bug 247471] devel/libedit

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247471

            Bug ID: 247471
           Summary: devel/libedit
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bapt at FreeBSD.org
          Reporter: pen at lysator.liu.se
          Assignee: bapt at FreeBSD.org
             Flags: maintainer-feedback?(bapt at FreeBSD.org)

When building a simple test program (at least when using libedit's readline
compatibility code) it mishandles Unicode characters.

% touch räksmörgås.txt

% cc -I/usr/local/include -DUSE_LIBREADLINE=1 -o tr tr.c -L/usr/local/lib
-lreadline
% ./tr
>räksmörgås.txt 
18 bytes

% cc -I/usr/local/include -DUSE_LIBEDIT -o tr tr.c -L/usr/local/lib -ledit
% ./tr
>r\U+00C3\U+00A4ksm\U+00C3\U+00B6rg\U+00C3\U+00A5s.txt 
18 bytes

(type "r" then TAB for tab-completion).

Also libedit doesn't really allow me to enter non us-ascii characters at all.

This is different behaviour from gnu readline (see the attached simple test
program). 

Behavior is the same on FreeBSD 11.3-RELEASE and CURRENT.

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