multi_buffer: Reduce RefCell::borrow_mut calls to the bare minimum (#40522)
Release Notes: - N/A *or* Added/Fixed/Improved ...
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@@ -72,13 +72,15 @@ impl ConflictSetSnapshot {
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(None, None) => None,
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(None, Some(conflict)) => Some(conflict.range.start),
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(Some(conflict), None) => Some(conflict.range.start),
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(Some(first), Some(second)) => Some(first.range.start.min(&second.range.start, buffer)),
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(Some(first), Some(second)) => {
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Some(*first.range.start.min(&second.range.start, buffer))
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}
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};
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let end = match (old_conflicts.last(), new_conflicts.last()) {
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(None, None) => None,
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(None, Some(conflict)) => Some(conflict.range.end),
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(Some(first), None) => Some(first.range.end),
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(Some(first), Some(second)) => Some(first.range.end.max(&second.range.end, buffer)),
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(Some(first), Some(second)) => Some(*first.range.end.max(&second.range.end, buffer)),
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};
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ConflictSetUpdate {
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buffer_range: start.zip(end).map(|(start, end)| start..end),
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