History of Engine::fit 3 changes

In crates/backdrop/src/lib.rs, lines 65–81 on 8ad8e656a3a654690a1c7577e34a8a744611e1a0119167bc3209cd5c87c18787. 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 65,81:crates/backdrop/src/lib.rs.