History of Mark::label 1 change

In crates/backdrop/src/mark.rs, lines 114–116 on a74ba3cb45110de2d93ca6a30715294f4a59b6bdf7f1b957125985b4dcb9794c. 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.