History of Colour::label 1 change

In crates/hub/src/diffusion.rs, lines 256–265 on bff9106edcba4b233102d8bbe226a6c207daca782691ab032f70368d2419e517. 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 256,265:crates/hub/src/diffusion.rs.