tests: stabilize test-convert-hg-source.t on Windows This was a missing update in 1b8fd4af3318. Differential Revision: https://phab.mercurial-scm.org/D8458

commit: tell user what to do with .hg/last-message.txt I have always assumed that the message will be reused by the next `hg commit`, but it seems it's just silently dropped on the next commit. Let's try to be more helpful by telling the user that they have to manually tell hg to reuse it. The file will still be lost if the user runs some other operation in between (like a non-in-memory rebase). That will be fixed once we've switched all operations to be in-memory :) I didn't include `$(hg root)/` in the path in the message to the user because that would have made the message too long. Hopefully the user will figure that part out themselves. Differential Revision: https://phab.mercurial-scm.org/D8463

test-check-rust-format: specify --edition=2018 rustfmt doesn't read Cargo.toml unless it's executed by cargo. https://github.com/rust-lang/rustfmt#rusts-editions

Added signature for changeset 26ce8e751503