History of unit 1 change

In crates/backdrop/src/sky.rs, lines 209–211 on 91c306aa47061a18f85e0109fa9d757a014b7267f8c14b4412a498cee9976e67. 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 209,211:crates/backdrop/src/sky.rs.