History of Engine::fit 3 changes

In crates/backdrop/src/lib.rs, lines 65–81 on a2fbad481dd75ba1ee2afa48f6c29f346b63af1fba971e53348db5f6790bb8a4. 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.