branching: merge stable into default This also added the small fix need in Rust tests for the new `DirstateMap::pack_v2` API change in stable.

rust-dirstate-v2: clean up previous data file after the docket is written This was overlooked before and caused many data files to keep living forever. We could potentially consider adding a random cleanup of them in case they slipped through one day. Differential Revision: https://phab.mercurial-scm.org/D12581

rust-dirstate-v2: save proper data size if no new data on append This is currently only triggered with the tests ran with `--rhg` without `--rust`, by "luck", there probably always was something to write, like an mtime when also using Rust extensions alongside `rhg`. Differential Revision: https://phab.mercurial-scm.org/D12580

amend: move "return None for removed files" into block handling filestoamend This is just a small logic cleanup from D12573, no change in behavior. Differential Revision: https://phab.mercurial-scm.org/D12576

rust-dirstatemap: remove unused helper from the old API Differential Revision: https://phab.mercurial-scm.org/D12541

rust-status: stop using `state()` in the dispatch logic Let's use the new API. Differential Revision: https://phab.mercurial-scm.org/D12540

rust-status: stop using `state()` in `handle_normal_file` Let's use the new API Differential Revision: https://phab.mercurial-scm.org/D12539

rust-dirstatemap: stop using `state()` in the cache logic Let's use the new API Differential Revision: https://phab.mercurial-scm.org/D12538

rust-dirstatemap: stop using `.state` in `is_from_other_parent` This is a deprecated API and will be removed one day. Differential Revision: https://phab.mercurial-scm.org/D12537

rust-dirstate-entry: add `modified` method This will also be used in other places later in the series. Differential Revision: https://phab.mercurial-scm.org/D12536

rust: remove use of `EntryState` in `DirsMultiset` Let's use the new API. Differential Revision: https://phab.mercurial-scm.org/D12535

rust: use `entry.tracked()` directly This is the new API Differential Revision: https://phab.mercurial-scm.org/D12534

rust-hg-cpython: remove use of `EntryState` Let's use the new API Differential Revision: https://phab.mercurial-scm.org/D12533

rust-dirstatemap: use a checked sub instead of a potentially underflowing one This was missed in 2593873cda0f Differential Revision: https://phab.mercurial-scm.org/D12532

rust-dirstatemap: add simpler version of `get_node_mut` This will help reduce code and footgun potential for simpler callers. Differential Revision: https://phab.mercurial-scm.org/D12531

rust-dirstatemap: use `get_node_mut` instead or `get_or_insert_node` This (along with the docstring), makes it more obvious that we're not expecting to insert a node here. This is less prone to bugs in later refactorings. Differential Revision: https://phab.mercurial-scm.org/D12530

rust-dirstatemap: add `each_ancestor` argument to `get_node_mut` This forces the callers to think about if the counters in the ancestors need to be adjusted. Differential Revision: https://phab.mercurial-scm.org/D12529

rust-dirstatemap: add simpler method `get_or_insert_node` for the common case All but one case use the exact same input for most arguments, this simplifies code and reduces footgun potential. Differential Revision: https://phab.mercurial-scm.org/D12528

rust-dirstatemap: inline the last `get_or_insert` call The `get_or_insert` method was dangerous because it did not take the `DirstateMap` counters into account. This particular instance does not need to update the counters. Differential Revision: https://phab.mercurial-scm.org/D12527

rust-dirstatemap: add `set_cached_mtime` helper method This will help remove the `get_or_insert` method, which is dangerous because it does not take the `DirstateMap` counters into account Differential Revision: https://phab.mercurial-scm.org/D12526

rust-dirstatemap: add `clear_cached_mtime` helper method This will help remove the `get_or_insert` method, which is dangerous because it does not take the `DirstateMap` counters into account. Differential Revision: https://phab.mercurial-scm.org/D12525

rust-dirstatemap: add unit tests These were missing and have already proven valuable since they have found two bugs (fixed in previous patches). There may be other behavior to test, but this gives us a decent coverage. Differential Revision: https://phab.mercurial-scm.org/D12524

rust: add `Debug` trait to a bunch of structs This is useful when... debugging. Right now the output is not in the most readable state it could be, but this is very low effort and is good enough for now. We may want to write a nicer custom debug formatter for some of those structs in the future. Differential Revision: https://phab.mercurial-scm.org/D12523

rust-dirstatemap: use `&HgPath` instead of `HgPathBuf` in `copy_map_insert` No reason to require an owned path here. Differential Revision: https://phab.mercurial-scm.org/D12522

rust-dirstatemap: use `DirstateEntry::tracked` directly `state()` is a legacy API that will be removed at some point, let's use the newer API. Differential Revision: https://phab.mercurial-scm.org/D12521

rust-cpython: remove unused API to `drop_entry_and_copy_source` This is not used anywhere anymore and its use cases are covered by the new API Differential Revision: https://phab.mercurial-scm.org/D12520

rust-dirstatemap: remove `set_dirstate_entry`/`set_entry` methods These methods were needed crutches before the Rust implementation caught up to Python. Calling `set_entry` (whether from Python or Rust) was dangerous since it didn't update any of the counters of the DirstateMap data structure, while having no real way of knowing when to use it "correctly" except it you were one of the 3 people who looked deep enough into the soul of this code. Differential Revision: https://phab.mercurial-scm.org/D12519

rust-dirstatemap: implement part of the `setparents` logic The Python code does many round-trip calls to the Rust dirstatemap when copy information needs to be dropped in `setparents`. This may result in improved performance on `commit`, `update` and other such commands, but was mostly done to drop the last use of `set_dirstate_item`. See inline comments for an asterisk about performance, and see next patch for why `set_dirstate_item` has to go. Differential Revision: https://phab.mercurial-scm.org/D12518

dirstate-item: add missing bit of docstring Differential Revision: https://phab.mercurial-scm.org/D12517

dirstatemap: move `_dirs_incr` and `_dirs_decr` methods out of the common They are only used by the Python implementation now Differential Revision: https://phab.mercurial-scm.org/D12516

dirstatemap: move `_refresh_entry` out of the common methods This is only used in the Python implementation now Differential Revision: https://phab.mercurial-scm.org/D12515

dirstatemap: move `_drop_entry` out of the common methods Only the Python implementation uses it. Differential Revision: https://phab.mercurial-scm.org/D12514

rust-dirstatemap: remove `_drop_entry` This is not used anywhere anymore Differential Revision: https://phab.mercurial-scm.org/D12513

rust-dirstatemap: remove `__settitem__` This is not used anywhere now. Differential Revision: https://phab.mercurial-scm.org/D12512

rust-dirstatemap: remove unused `_refresh_entry` implementation This was only used in the newer APIs, all of which have been rewritten in Rust Differential Revision: https://phab.mercurial-scm.org/D12511

rust-distatemap: remove `addfile` API All of its users have been migrated to the new API Differential Revision: https://phab.mercurial-scm.org/D12510

rust-dirstatemap: remove `removefile` API Its callers have been migrated to the newer dirstate API. Differential Revision: https://phab.mercurial-scm.org/D12509

rhg: use the new `set_clean` API Differential Revision: https://phab.mercurial-scm.org/D12508

dirstatemap: move `set_untracked` out of the common methods There is a dedicated Rust implementation now Differential Revision: https://phab.mercurial-scm.org/D12507

rust-dirstatemap: add `set_untracked` method This is the new API that Python has already migrated to Differential Revision: https://phab.mercurial-scm.org/D12506

dirstatemap: move `set_possibly_dirty` out of the common methods There exists now a dedicated Rust implementation Differential Revision: https://phab.mercurial-scm.org/D12505

rust-dirstatemap: add `set_possibly_dirty` method This is the new API that Python has already migrated to. Differential Revision: https://phab.mercurial-scm.org/D12504

dirstatemap: move `set_clean` out of common methods This now has a dedicated Rust implementation Differential Revision: https://phab.mercurial-scm.org/D12503

rust-dirstatemap: add `set_clean` method This is the new dirstate API that has already been moved to in Python. Differential Revision: https://phab.mercurial-scm.org/D12502

dirstatemap: remove `_insert_entry` This was needed as a compatibility layer for the Python and Rust implementations, but it is not called from anywhere in Rust anymore. The two remaining calls have been inlined. Differential Revision: https://phab.mercurial-scm.org/D12501

dirstatemap: move `reset_state` out of common methods Now that we have a Rust implementation, we defer to that accordingly. Differential Revision: https://phab.mercurial-scm.org/D12500

rust-dirstatemap: add Rust implementation of `reset_state` This is the new API which has already been defined in Python Differential Revision: https://phab.mercurial-scm.org/D12499

rust-dirstate: introduce intermediate struct for dirstate-v2 data This is passed often as a long tuple that is not easy to know the form of, so we refactor everything in this struct. This also renames `wdir_tracked` to follow the Python `wc_tracked`, even though the on-disk format uses `WDIR_TRACKED`. I think a single naming scheme is better, but we can't easily break the Python impl now because of extensions, so this is low-effort enough and facilitates grepping. Differential Revision: https://phab.mercurial-scm.org/D12498

dirstatemap: remove unused parameter from `reset_state` This has no callers using it and is not used inside the method itself. Differential Revision: https://phab.mercurial-scm.org/D12497

dirstatemap: move `set_tracked` out of common methods and plug in Rust We now have a Rust-specific implementation of this method, it is no longer shared between both implementations. Differential Revision: https://phab.mercurial-scm.org/D12496

rust-dirstatemap: add `set_tracked` method This is the new dirstate API that has already been moved to in Python. It will be used in place of the old `addfile`/`removefile` one. Differential Revision: https://phab.mercurial-scm.org/D12495

changelog: avoid copying changeset data into `ChangesetRevisionData` Differential Revision: https://phab.mercurial-scm.org/D12548

rust-nodemap: remove unnecessary explicit lifetime Differential Revision: https://phab.mercurial-scm.org/D12486

rust-revlog: add tests for p1/p2 getters, as promised in D12442 Differential Revision: https://phab.mercurial-scm.org/D12565

rust-revlog: make `IndexEntryBuilder` build a whole entry The `IndexEntryBuilder` we have in tests only built part of a revlog entry before this patch. It's more useful if it can build a full entry. As part of fixing that, I also added a (non-test) `IndexEntry::link_revision()`. Differential Revision: https://phab.mercurial-scm.org/D12564

rust-revlog: change default version from 2 to 1 in test builder Version 1 is the only version we support, so it seems like the natural choice for making it easy to create valid revlogs. Differential Revision: https://phab.mercurial-scm.org/D12563

rust-repo: extract a function for checking nodemap requirement Differential Revision: https://phab.mercurial-scm.org/D12562

rust-revlog: make `Changelog` and `ManifestLog` unaware of `Repo` As with other recent patches, this makes the types easier to test and reuse. Differential Revision: https://phab.mercurial-scm.org/D12561

rust-revlog: make unaware of `Repo` Differential Revision: https://phab.mercurial-scm.org/D12547

rust-filelog: don't use persistent nodemap (to match Python) Differential Revision: https://phab.mercurial-scm.org/D12558