Comment by WovenTales

The trick with that is that it also prevents wrapping except on new lines in the source. Looking at the potential values, I'd recommend pre-wrap instead, which at least allows avoiding horizontal scrolling, at the cost of requiring you to write the entire contents in a single line of markup. Annoyingly, it doesn't seem like there's a way to avoid multiple spaces being collapsed without also giving special meaning to keeping the source less than 120 characters (or whatever other measure) wide.