bug#38223: grep >=2.28 cannot handle -wF correctly under LANG=ja_JP.eucjp

[Jim Meyering]

On Fri, Nov 15, 2019 at 11:54 AM NIDE, Naoyuki <address@hidden> wrote:
> echo ba | LANG=ja_JP.eucjp grep -F -w a
> outputs ba, but should output nothing.

Thank you for that report. It is reproducible for me on Fedora 30.
Here is a fix, but the commit is incomplete: I am still in the process
of preparing a test case and the NEWS entry.
Will also fix the erroneous comment just below in a separate patch.

grep-Fw-mb-non-utf8.diff
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