History of unit 1 change

In crates/backdrop/src/sky.rs, lines 158–160 on 58cbf42447bc0677932c1882ab0f2935be41175e51405f4b3d641cba95f0ab56. 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 158,160:crates/backdrop/src/sky.rs.