dirstate-v2: Add storage space for nanoseconds precision in file mtimes For now the sub-second component is always set to zero for tracked files and symlinks. (The mtime of directories for the `readdir`-skipping optimization is a different code path and already uses the full precision available.) This extra storage uses the space previously freed by replacing the 32-bit `mode` field by two bits in the existing `flags` field, so the overall size of nodes is unchanged. (This space had been left as padding for this purpose.) Also move things around in the node layout and documentation to have less duplication. Now that they have the same representation, directory mtime and file mtime are kept in the same field. (Only either one can exist for a given node.) Differential Revision: https://phab.mercurial-scm.org/D11655

status: Extract TruncatedTimestamp from fs::Metadata without SystemTime On Unix, the Rust standard library exposes `mtime` and `mtime_nsec` methods for `std::fs::Metada` whih is exactly what we need to construct a `TruncatedTimestamp`. This skips the computation in the conversion through `SystemTime` and `Result<Duration, Duration>`. Differential Revision: https://phab.mercurial-scm.org/D11654

pyoxidizer: add the user site to `sys.path` on macOS This allows 3rd party extensions that are installed with `pip` to be picked up, similar to what we do on Windows. PyOxidizer has a bug that prevents this from working without this extra help (see 95af358fcdfe), though it appears there's another wrinkle here with `sys._framework` too. I needed this to see if the problem[1] loading the keyring extension on Windows also occurs on macOS (it doesn't). [1] https://github.com/indygreg/PyOxidizer/issues/445 Differential Revision: https://phab.mercurial-scm.org/D11452

pyoxidizer: don't use in-memory for resources on macOS When trying to debug something else on macOS, pyoxidized builds were failing with the following message about pywatchman (and then cext.base85 when I commented out pywatchman): "cannot be loaded from memory but memory loading required" I don't have any immediate plans to do more work on macOS, but maybe this will save someone else time debugging this. Differential Revision: https://phab.mercurial-scm.org/D11451

chistedit: rename a confusingly named variable I would expect `ctxs` contain instances of some class from the `context` module but it actually contains instances of `histeditrule`. Differential Revision: https://phab.mercurial-scm.org/D11653

chistedit: remove some local variable and access state on self instead Now that we've replaced the state dict by a class, some of the local variables that just do `foo = self.foo` seem unnecessary. Differential Revision: https://phab.mercurial-scm.org/D11652

chistedit: move changeview() onto state class Differential Revision: https://phab.mercurial-scm.org/D11649

chistedit: move cycleaction() onto state class Differential Revision: https://phab.mercurial-scm.org/D11648

chistedit: move changeaction() onto state class Differential Revision: https://phab.mercurial-scm.org/D11647

chistedit: move swap() onto state class Differential Revision: https://phab.mercurial-scm.org/D11646