History of Sky::layout 3 changes

In crates/backdrop/src/sky.rs, lines 304–343 on 4dfa4599b3f7e3d1150681fcfca0c2e459262806e6248033cc1ae9cb27de1912. 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 304,343:crates/backdrop/src/sky.rs.