History of knot 1 change

In crates/backdrop/src/field.rs, lines 218–229 on 0ee5c3fb32eb9084f236277ff9c487c20adbe99ff6f26a2a2e04d2069e98f594. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 218,229:crates/backdrop/src/field.rs.