History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on 34388e6129637c460252d3a72a4f6baf82b3e9a3bb312c4aead484e1fa8a5756. 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 266,384:crates/backdrop/src/lib.rs.