History of Colour::label 1 change

In crates/hub/src/diffusion.rs, lines 256–265 on 6907a989e82a4f7554dff2b26b0cd053ff97958eb030b97b62542db1cb0d3bae. 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.