diff: minor cleanup of unchanged regions #4629
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The Ord implementation didn't conform to Eq (which compares "self.others" literally), and we don't need Ord to insert non-overlapping ranges before the current range.
This isn't important, but I'm going to add another empty range at the start, and it's easier if the modification of regions is scoped.
This seems more consistent as we have a terminal range at the end.
We don't have to test emptiness of contents between unchanged regions.
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Checklist
If applicable:
CHANGELOG.md