typedef unsigned short ImWchar;     // A single U16 character for keyboard input/display. We encode them as multi bytes UTF-8 when used in strings.

void ImGuiIO::AddInputCharactersUTF8(const char* utf8_chars)
{
    while (*utf8_chars != 0)
    {
        unsigned int c = 0;
        utf8_chars += ImTextCharFromUtf8(&c, utf8_chars, NULL);
        if (c > 0 && c <= 0xFFFF)    // <---- DISCARDS c >= 0x10000
            InputQueueCharacters.push_back((ImWchar)c);
    }
}

       if (c < 0x10000)    // FIXME: Losing characters that don't fit in 2 bytes
            *buf_out++ = (ImWchar)c;

    //else if (c < 0x10000)
    {
        if (buf_size < 3) return 0;
        buf[0] = (char)(0xe0 + (c >> 12));
        buf[1] = (char)(0x80 + ((c>> 6) & 0x3f));
        buf[2] = (char)(0x80 + ((c ) & 0x3f));
        return 3;
    }