The previous code:
if (curFieldLen < width) {
...
strncpy(bar + curFieldLen + 2, help, width - curFieldLen - 2);
was not correctly guarded against cache entries whose size were exactly
1 or 2 characters short of the window size.
"if (curFieldLen - 2 < width)" would have prevented a copy of
negative/max_int characters and a subsequent crash.
The whole method was modernized with std::string instead of char*
b4ef7fbaa8