relnotes: make spacing before new section consistent
Differential Revision: https://phab.mercurial-scm.org/D8768
== New Features ==
* clonebundles can be annotated with the expected memory requirements
using the `REQUIREDRAM` option. This allows clients to skip
bundles created with large zstd windows and fallback to larger, but
less demanding bundles.
* The `phabricator` extension now provides more functionality of the
arcanist CLI like changing the status of a differential.
* Phases processing is much faster, especially for repositories with
old non-public changesets.
== New Experimental Features ==
* The core of some hg operations have been (and are being)
implemented in rust, for speed. `hg status` on a repository with
300k tracked files goes from 1.8s to 0.6s for instance.
This has currently been tested only on linux, and does not build on
windows. See rust/README.rst in the mercurial repository for
instructions to opt into this.
== Backwards Compatibility Changes ==
* Mercurial now requires at least Python 2.7.9 or a Python version that
backported modern SSL/TLS features (as defined in PEP 466), and that Python
was compiled against a OpenSSL version supporting TLS 1.1 or TLS 1.2
(likely this requires the OpenSSL version to be at least 1.0.1).
* The `hg perfwrite` command from contrib/perf.py was made more flexible and
changed its default behavior. To get the previous behavior, run `hg perfwrite
--nlines=100000 --nitems=1 --item='Testing write performance' --batch-line`.
== Internal API Changes ==
* logcmdutil.diffordiffstat() now takes contexts instead of nodes.
* The `mergestate` class along with some related methods and constants have
moved from `mercurial.merge` to a new `mercurial.mergestate` module.
* The `phasecache` class now uses sparse dictionaries for the phase data.
New accessors are provided to detect if any non-public changeset exists
(`hasnonpublicphases`) and get the correponsponding root set
(`nonpublicphaseroots`).