History of Engine::fit 3 changes

In crates/backdrop/src/lib.rs, lines 65–81 on a268d4df52bf2e3806d9caaec2d5bc3b8f1128968636a1e84513588fb656b7ee. 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.