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# Mercurial 3.8 (2016-04-30)
## Mercurial 3.8 release
### Features
- `hg update` and other commands that can perform update (such as `hg pull -u`) now warn about other topological heads
- [[CHg|cHg]] has been added
- `hg update` now updates to the tip-most changeset on the same topological branch. Before, it would update to the tip-most changeset, possibly on a different topological head
- Hints on how to continue interrupted commands are now printed (e.g. `hg resolve -m` will now tell you to run `hg rebase --continue` or `hg histedit --continue`)
- The experimental automv extension has been added. This extension attempts to detect file copes and renames automatically.
- The 3rd party hgwatchman extension has been imported as the [[FsMonitorExtension|fsmonitor extension]]. This extension uses filesystem watching to make commands like hg status significantly faster on large repositories.
- `hg rebase` now chooses its default destination the same way `hg merge` does
- `hg pull -u` now activates a bookmark if the has a bookmark
- `hg pull -u` now deactivates a bookmark if the destination doesn't match the existing bookmark
- Improved edge styles in graph log. Cset:d7af9b4ae7dd
- User template keywords and functions can be defined in `[templatealias]` section.
- It's now possible to push the active bookmark using `hg push -B .`.
### Improvements
This release includes many improvements, including (but not limited to):
- performance of copy detection during rebases has been improved, potentially leading to faster rebase execution
- performance of `hg log -f <file>` has been improved
- syntax errors in loaded extensions are now handled better
- `hg update` on Windows should now be up to 4x faster
- JSON encoding should now be proper UTF-8 for all inputs
- Performance of the `-` revset operator has been improved
- The blackbox extension now logs more data
- "hgext" is now a Python namespace package
- revsets accessing changelog data (commit messages, authors, dates) are now 10-15% faster
- hg.exe built in MinGW will now link against the proper Python DLL
A full overview is available on WhatsNew.
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