History of Mark::label 1 change

In crates/backdrop/src/mark.rs, lines 114–116 on 4c77a1c8aad8799227421360bab76001757ca9fe11cf66324a7d1e6997ef6b7b. 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.