History of Swarm::layout 2 changes

In crates/backdrop/src/swarm.rs, lines 88–112 on dd327d76062d8685bec98f4eb43ae719b4e1c55f8ffbcc87b3c4da72dda04705. 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.