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== New Features ==
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* `hg config` now has a `--source` option to show where each
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configuration value comes from.
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* Introduced a command (debug-repair-issue6528) to repair repositories affected
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by issue6528 where certain files would show up as modified even if they were
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clean due to an issue in the copy-tracing code.
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== Default Format Change ==
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These changes affect newly created repositories (or new clone) done with
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Mercurial 5.9.
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== New Experimental Features ==
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* A `changelogv2` format has been introduced. It is not ready for use yet, but
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will be used later to address some of the weaknesses of the current revlog
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format.
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* Initial experiment and support for `dirstatev2`, a new dirstate format that
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addresses some of the weaknesses of the current dirstate format. Python + C
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and Rust support are being implemented, but the Rust solution is the one
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currently getting the attention for performance.
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* Initial support for `rhg status`. `rhg` is the Rust wrapper executable for hg
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that shortcuts some commands for faster execution speed.
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== Bug Fixes ==
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* Fixed committing empty files with `narrow`
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* Allow overriding `pip`'s pep517 compliance to build C or Rust extensions
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* Fixed regression on outgoing email when not specifying revisions
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* Fixed a regression causing bookmarks to disappear when using Rust persistent nodemap
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* Fixed a regression (in 5.9.1) introduced in 5.9 when cloning repos with
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deep filenames
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* Fixed detection of directories becoming symlinks, but only when using the
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Rust extensions.
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* Fixed ignore and include not composing in the Rust status
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* `hg commit --interactive` now handles deselecting edits of a rename
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* Fixed a case where `hg evolve` gives different results when interrupted
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* Fixed a memory leak in phases computation
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* `histedit` and `shelve` don't swallow errors when updating the working copy
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anymore
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* Improve error message when detecting content-divergence with a hidden
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common predecessor
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* No longer re-order parents in filelog, see issue6533
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* Fix revisions affected by issue6533 on the fly during exchange
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* Many Windows fixes for stability and py3 compatibility improvements
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* Many other miscellaneous fixes
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== Backwards Compatibility Changes ==
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== Internal API Changes ==
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The Dirstate API have been updated as the previous function leaked some
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internal details and did not distinguish between two important cases: "We are
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changing parent and need to adjust the dirstate" and "some command is changing
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which file is tracked". To clarify the situation:
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* the following functions have been deprecated,
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- `dirstate.add`,
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- `dirstate.normal`,
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- `dirstate.normallookup`,
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- `dirstate.merge`,
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- `dirstate.otherparent`,
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- `dirstate.remove`,
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- `dirstate.drop`,
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- `dirstateitem.__getitem__`,
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* these new functions are added for the "adjusting parents" use-case:
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- `dirstate.update_file`,
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- `dirstate.update_file_p1`,
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* these new function are added for the "adjusting wc file" use-case":
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- `dirstate.set_tracked`,
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- `dirstate.set_untracked`,
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- `dirstate.set_clean`,
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- `dirstate.set_possibly_dirty`,
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See inline documentation of the new functions for details.
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* Additionally, the following have been deprecated:
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- `urlutil.getpath` function
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- `localrepository.updatecaches`' `full` argument
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* The following have been removed:
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- `revlog.revlogio` has been removed
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