Yep -- formatting for style is great iff it’s done rigorously and consistently on every commit (which is what a presubmit check is good for). Ad-hoc reformattin

Yep -- formatting for style is great iff it’s done rigorously and consistently on every commit (which is what a presubmit check is good for). Ad-hoc reformatting mingled in with real changes plays havoc with change tracking. Ideally the format would never change at all. An occasional change-the-world update is a reasonable compromise, but it should be done as a single commit with no logic changes.