History of knot 1 change

In crates/backdrop/src/field.rs, lines 218–229 on a2a96bf2145547ea848d22a6d58489572763db661cf161232fb315e618a4be8f. 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.