History of knot 1 change

In crates/backdrop/src/field.rs, lines 218–229 on 03bfb945f5c1802fccb5e2b81155f569b5ea76039bf4f747cf3be08a8e27d458. 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.