History of propagate 2 changes

In crates/hub/src/diffusion.rs, lines 851–853 on 9a777fec4ed9b8ffdd115cbfc4537d1b0caa63a602c7fe17eef7d99ac601ca27. 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 851,853:crates/hub/src/diffusion.rs.