Pretty Print Tidy makes very few changes to most code, and is the only way at the moment to get the code formatted nicely automatically. In fact, without Pretty Pretty Tidy (with Clean Source set to off), you would be surprised at the number of books that won't open due to errors. At least that's what happened when the setting was defaulted to off for a version. Its really only HTML Tidy that makes, in my view, too many changes - but still some people prefer it so its available for them. Turning Clean Source completely off is certainly possible - and may be useful for those who know exactly how their code is formatted and don't want any changes, which is why its there too.
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