History of Mark::step 1 change

In crates/backdrop/src/mark.rs, lines 101–107 on f2d2776b2a14a2bb090bdb7a6a26debd0a86f6357c3ffdd8267a36207049fa9e. 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 101,107:crates/backdrop/src/mark.rs.