History of knot 1 change

In crates/backdrop/src/field.rs, lines 218–229 on 32cfb089f5e6a8eede757776fa39cf1fe98594bda3c89cfc867f07d768d7b510. 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.