History of Sky::step 2 changes

In crates/backdrop/src/sky.rs, lines 428–483 on 4f40eed0588f55ff8e73d82b0f9cdc24a5864cb105bd3cbb8bab35126c9580fb. 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 428,483:crates/backdrop/src/sky.rs.