History of start 3 changes

In crates/backdrop/src/lib.rs, lines 266–384 on d061ac87618c3b6171633725d2e7acf67af9c5cff5a70e860c88d1bde410fc74. 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.