diff: use cmdutil.check_at_most_one_arg() for checking --rev/--change The same check was done in extdiff as well, so I fixed that too. There are apparently no tests for this. Differential Revision: https://phab.mercurial-scm.org/D8510

copy: give better error message when no source paths found with --at-rev The new error message matches what we show when marking copies in the working copy. Differential Revision: https://phab.mercurial-scm.org/D8496

tests: show poor error message for `hg cp -A --at-rev . non-existent dst` Differential Revision: https://phab.mercurial-scm.org/D8495

copy: to find copy source, walk parent of revision we're marking copies in As shown in the previous patch, `hg cp --after --at-rev . src dst` fails if `src` is not in `.`. It seems obvious that you should always walk the *parent* of the revision you're marking copies in, but that's not how it was done for the working copy, and I didn't think to change it when marking copies in a non-working-copy commit. This patch fixes that by walking the parent commit instead, but only if we're marking copies for a non-working-copy commit. We need to leave the working-copy code unchanged because it depends on the weird behavior of `workingctx.walk()`. With these changes, there's very little overlap between the working-copy version and the non-working-copy version of `walkpats()`, but I've refrained from cleaning that up on the stable branch. Differential Revision: https://phab.mercurial-scm.org/D8494

tests: show that `hg cp -A --at-rev .` doesn't work for renames I clearly forgot to implement (and test) support for marking of renames when I added support for marking of copies :( Differential Revision: https://phab.mercurial-scm.org/D8493

rust-matchers: add TODO about incomplete `Display` for `IncludeMatcher` This is purely for future reference, I don't think this is a problem right now, since the `Display` is *only* used to ease debugging and has no real users. Differential Revision: https://phab.mercurial-scm.org/D8492

rust-filepatterns: match exact `rootglob`s with a `HashSet`, not in the regex This optimization yields some very interesting results in `rootglob`-heavy repositories. I build a test repository of the following structure: ``` root /<uuid>/build/empty_file ... repeat for 4000 entries ``` and a `.hgignore` containing the corresponding 4000 `rootglob` entries pointing to all `build/` folders. Rust+c `hg status` goes from 350ms down to 110ms. Differential Revision: https://phab.mercurial-scm.org/D8491