[issue18041] mention issues with code churn in the devguide

[Éric Araujo]

Éric Araujo added the comment:

Tshepang is referring to cases where a patch changes one line but affects ten other lines because a paragraph was rewrapped, modernizing code, updating tests to use latest helpers, etc.

I’ve actually seen two contrary kinds of advice: do cleanups when you touch the code for a bug fix or new feature (the holistic approach / anti-code churn) vs. separate concerns with separate commits.

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