b165f6e25e8044d10c0e354b7301adcc9dedd4fa is the first bad commit
commit b165f6e25e8044d10c0e354b7301adcc9dedd4fa
Author: aquileia <[email protected]>
Date:   Sat Mar 22 15:13:57 2014 +0100

    Improve UTF-8 handling

    For manipulation of UTF-8 encoded strings (insert, delete, truncate, and
    size), usually conversion to wstring and back was necessary. This has
    two disadvantages:
    * the size of wstring is implementation defined
    * the
    double conversion is slow

    The purpose of this patch is to add functions
    to handle these tasks by a layer handling the different indexing between
    codepoints and characters.

    This commit applies these functions in
    several places to replace the old implementations.

    The byte_size_from_utf8_first() implementation will be replaced in a
    separate commit as it relies on the count_leading_ones function by 8680.

    Signed-off-by: aquileia <[email protected]>

:040000 040000 9261d0c18b9dd497cda02c6bd7ab0b05f49aa96f 0920eec562c9868dae9b6a5d8f3b03d1d458cd15 M      src