> I confirm the problem. Looks like there's a bug in UTF-8 handling in
> function mb_strnicmp() in mbyte.c, specifically in the following "if"
> which was introduced by patch 7.3.040:
>
> /* Don't case-fold illegal bytes or truncated characters. */
> if (utf_ptr2len(s1 + i) < l || utf_ptr2len(s2 + i) < l)
> return -1;
>
> The check "utf_ptr2len(s2 + i) < l" is wrong.
Yes, this code just returns -1, no matter if the first or second string
is bigger.
Your other remark about difference in byte length of a character is
right, but it's not so easy to fix. Can you suggest a patch?
Preferably with a test.
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