History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on 858eca0d03c490d07d01bfa9748d5cc5742c749d31ecbbf882ece33f2ae0fcc5. 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.