updated for version 7.3.253 Problem: "echo 'abc' > ''" returns 0 or 1, depending on 'ignorecase'. Checks in mb_strnicmp() for illegal and truncated bytes are wrong. Should not assume that byte length is equal before case folding. Solution: Add utf_safe_read_char_adv() and utf_strnicmp(). Add a test for this. (Ivan Krasilnikov)

buffer-local autommand in xx