History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on 1062a0f8e985bb8c65ab90ccae6309f38730152b13ca9e9c579d6f5751053161. 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.