Don't double-escape search terms before highlighting. It's done once already SearchRe...

Don't double-escape search terms before highlighting. It's done once already SearchResultSet::termMatches(). Doing it twice results in / -> \/ -> \\/, literal backslash followed by end of regex. Not obvious in SearchMySQL because of stripForSearch(), but visible in MWSearch.

The fact that it's done in termMatches() already is hackish and undocumented, but I won't change it right now.