History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on 965b950f9b9657901127c61c6b689afee7d0c564d08d767a566a24a4719a3b59. 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.