History of Sky::label 2 changes

In crates/backdrop/src/sky.rs, lines 543–554 on 12325e1b1020cc524c223e398bfa7b63f6596b104731de0dabf571a75ad7b0fc. 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 543,554:crates/backdrop/src/sky.rs.