History of Field::label 1 change

In crates/backdrop/src/field.rs, lines 176–187 on 7dbb41b09a99ace1e68892a6b1da3c695c46b2b549b2cbb51a42e272be91a25e. 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 176,187:crates/backdrop/src/field.rs.