History of swap 2 changes

In crates/flow/src/update.rs, lines 247–264 on v0.5.2. 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 247,264:crates/flow/src/update.rs.