History of Mark::label 1 change

In crates/backdrop/src/mark.rs, lines 114–116 on c8684d44d549e0c7c40f0202032904814d318fbb5e75df1c5624225a06dc7668. 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 114,116:crates/backdrop/src/mark.rs.