History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on b9eb70fb95093d2f5542ebc2c94a199d4d7b1c7e1423f1821e20fef9021bd661. 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.