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== New Features ==
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* clonebundles can be annotated with the expected memory requirements
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using the `REQUIREDRAM` option. This allows clients to skip
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bundles created with large zstd windows and fallback to larger, but
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less demanding bundles.
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* The `phabricator` extension now provides more functionality of the
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arcanist CLI like changing the status of a differential.
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* Phases processing is much faster, especially for repositories with
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old non-public changesets.
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== New Experimental Features ==
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* The core of some hg operations have been (and are being)
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implemented in rust, for speed. `hg status` on a repository with
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300k tracked files goes from 1.8s to 0.6s for instance.
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This has currently been tested only on linux, and does not build on
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windows. See rust/README.rst in the mercurial repository for
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instructions to opt into this.
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* An experimental config `rewrite.empty-successor` was introduced to control
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what happens when rewrite operations result in empty changesets.
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== Bug Fixes ==
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* For the case when connected to a TTY, stdout was fixed to be line-buffered
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on Python 3 (where it was block-buffered before, causing the process to seem
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hanging) and Windows on Python 2 (where it was unbuffered before).
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* Subversion sources of the convert extension were fixed to work on Python 3.
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* Subversion sources of the convert extension now interpret the encoding of
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URLs like Subversion. Previously, there were situations where the convert
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extension recognized a repository as present but Subversion did not, and
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vice versa.
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* The empty changeset check of in-memory rebases was fixed to match that of
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normal rebases (and that of the commit command).
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* The push command now checks the correct set of outgoing changesets for
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obsolete and unstable changesets. Previously, it could happen that the check
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prevented pushing changesets which were already on the server.
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== Backwards Compatibility Changes ==
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* Mercurial now requires at least Python 2.7.9 or a Python version that
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backported modern SSL/TLS features (as defined in PEP 466), and that Python
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was compiled against a OpenSSL version supporting TLS 1.1 or TLS 1.2
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(likely this requires the OpenSSL version to be at least 1.0.1).
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* The `hg perfwrite` command from contrib/perf.py was made more flexible and
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changed its default behavior. To get the previous behavior, run `hg perfwrite
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--nlines=100000 --nitems=1 --item='Testing write performance' --batch-line`.
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* The absorb extension now preserves changesets with no file changes that can
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be created by the commit command (those which change the branch name
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compared to the parent and those closing a branch head).
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== Internal API Changes ==
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* logcmdutil.diffordiffstat() now takes contexts instead of nodes.
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* The `mergestate` class along with some related methods and constants have
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moved from `mercurial.merge` to a new `mercurial.mergestate` module.
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* The `phasecache` class now uses sparse dictionaries for the phase data.
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New accessors are provided to detect if any non-public changeset exists
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(`hasnonpublicphases`) and get the correponsponding root set
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(`nonpublicphaseroots`).
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* The `stdin`, `stdout` and `stderr` attributes of the `mercurial.pycompat`
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module were removed. Instead, the attributes of same name from the
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`mercurial.utils.procutil` module should be used, which provide more
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consistent behavior across Python versions and platforms.
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