History of Swarm::layout 2 changes

In crates/backdrop/src/swarm.rs, lines 88–112 on 5436f0dd942938b88d95fa7451994bfec9477a11cea9c9d15df6854bd9f5a828. 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 88,112:crates/backdrop/src/swarm.rs.