view relnotes/6.1 @ 48946:642e31cb55f0

py3: use class X: instead of class X(object):

The inheritance from object is implied in Python 3. So this should
be equivalent.

This change was generated via an automated search and replace. So there
may have been some accidental changes.

Differential Revision: https://phab.mercurial-scm.org/D12352

'''This is the last release to support Python 2. Mercurial is Python 3 only starting with 6.2'''

= Mercurial 6.1rc0 =

== New Features ==
  * Added a way of specifying required extensions that prevent Mercurial from starting if they are not found. See `hg help config.extensions`.
  * Merge conflict markers have been made clearer (see backwards compatibility below)
  * Improve detailed error codes
  * Added a hint about mangled whitespace on bad patch
  * Explain which order the commits are presented in `chistedit`
  * Introduce a `dirstate-tracked-hint` feature to help automation keep track of changes to tracked files. See `hg help config.use-dirstate-tracked-hint`.
  * Shared repositories can be upgraded if the upgrade is specific to the share. For now, this only applies to `dirstate-v2` and `dirstate-tracked-hint`.
  * When using the `narrow` extension, non-conflicting changes to files outside of the narrow specification can now be merged.
  * When cloning a repository using stream-clone, the client can now control the repository format variants to use as long as the stream content does not restrict that variant.

== Default Format Change ==

These changes affect newly created repositories (or new clones) done with Mercurial 6.1.

  * The `share-safe` format variant is now enabled by default. It makes configuration and requirements more consistent across repository and their shares. This introduces a behavior change as shares from a repository using the new format will also use their main repository's configuration. See `hg help config.format.use-share-safe` for details about the feature and the available options for auto-upgrading existing shares.


== New Experimental Features ==
  * The pure Rust version of Mercurial called `rhg` added support for most common invocations of `hg status`. See `hg help rust.rhg` for details on how to try it out.
  * `rhg` supports narrow clones and sparse checkouts.

== Bug Fixes ==

  * '''Obsolete revisions are skipped while computing heads. In conjunction with the `evolve` extension >= 10.5.0, this leads to massive exchange (push/pull) speedups in repositories with a lot of heads and/or obsolete revisions.'''
  * Stream-clones now properly advertise all requirements needed. This can result in the stream-clone feature being disabled for some clients using < 6.0.2. A small bugfix patch for these older client is available if necessary.
  * The `--no-check` and `--no-merge` flags now properly overwrite the behavior from `commands.update.check`
  * `rhg`'s fallback detection is more robust in general in the presence of more advanced configs
  * `rhg`'s `blackbox` now supports milliseconds by default and uses the same ISO 8601 format as the Python implementation
  * Fix `rhg` crash on non-generaldelta revlogs
  * The `lfs`, `largefiles` and `sparse` extensions now correctly take the appropriate lock before writing requirements 
  * The `notify` extension does not produce errors anymore if a revision is not found
  * Remove unnecessary and overly strict check for divergence in `hg fix`
  * Windows compatibility improvements
  * Miscellaneous Python 3 and typing improvements
  * Many other small or internal fixes

== Backwards Compatibility Changes ==

  * The use of `share-safe`, means shares (of new repositories) will also use their main repository's configuration see the `Default Format Change` section for details.
  * The fix to stream-clone requirements advertising means some requirements previously (wrongly) omitted are now sent. This can confuse client using a Mercurial version < 6.0.2. The client would consider these requirements unsupported even if it actually know them. If you encounter this, either upgrade your client or apply the necessary patch.
  * The labels passed to merge tools have changed slightly. Merge tools can get labels passed to them if you include `$labellocal`, `$labelbase`, and/or `$labelother` in the `merge-tool.<tool name>.args` configuration. These labels used to have some space-padding, and truncation to fit within 72 columns. Both the padding and the truncation has been removed.
  * Some of the text in labels passed to merge tools has changed. For example, in conflicts while running `hg histedit`, the labels used to be "local", "base", and "histedit". They are now "already edited", "parent of current change", and "current change", respectively.
  * The computation of namedbranch heads now ignores obsolete revisions. User of the Changeset Evolution feature may see a change in location and numbers of heads of each named branches (and topic).
  * The remotefilelog extension now requires an appropriate excludepattern for subrepositories.
  * `debugsparse`'s interface has been reworked to be more flexible. Since it's a debug command it is not actually a breaking change, but it is worth noting here.
  * Temporary files for merges are now all inside a `hgmerge` directory instead of at the root of `TMPDIR`. The corresponding experimental `mergetempdirprefix` config option has been removed.

== Internal API Changes ==

  * The dirstate API received minor modifications.

== Miscellaneous ==

  * Removed exchange-v2. It was a prototype that had never been in a working state and had been left untouched since 2017.