History of Settings::usable 2 changes

In crates/hub/src/signin.rs, lines 100–102 on 7e51c8a2d23ce0be5a194003d282f92118706bf3a799701f0ca7ef513457567c. 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 100,102:crates/hub/src/signin.rs.