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# Mercurial 3.9 (2016-08-01)
## Mercurial 3.9 release
### Features
- ui.textwidth can now be set to define width of help text
- separate() template function added
- ui.rollback can be set to false to disable the `hg rollback` command
- fail-<command> hooks now run when a command fails
- experimental.graphstyle.* config options to control styling of graphs in console
- experimental.histedit.autoverb allows histedit lines beginning with "verb!" to be interpreted as histedit actions
- [hostsecurity] config section for defining advanced per-host security settings
- ability to define the SHA-256 and SHA-512 hashes of pinned server certificates
- ability to define CA certificates on a per-host basis
- ability to define the minimum TLS protocol version on a global or per-host basis
- sort() revset can now perform topological sorts using the ''topo'' option
- hgweb can now render JSON for ''filelog'', ''filerevision'', ''summary'', and ''search'' web commands
- [paths] entries can now define a ''pushrev'' sub-option to control which revisions to push by default
- The experimental [[JournalExtension|'journal' extension]] was added, allowing users to view the previous positions of bookmarks and the working copy
### Improvements
This release includes many improvements, including (but not limited to):
- performance of `hg diff` has been improved
- chg now detects more changes to the configuration and execution environment
- SSL/TLS code has been significantly refactored and now is consistent across all consumers (HTTPS, SMTPS)
- performance improvements to server communication (particularly for the largefiles and remotefilelog extensions)
- connections to servers whose certificate authority (CA) is unknown are now
refused even if no CA certificates are available
(see SecureConnections for details)
- fingerprints of server certificates are now printed using SHA-256 instead of SHA-1
- reads and writes to certain files is now robust and avoids more race conditions and edge cases (see ExactCacheValidationPlan)
- performance improvements to certain revsets
- cloning will no longer prompt for a password multiple times when cloning from a server that requires a password
- annotate view in hgweb now groups lines into blocks depending on their revision and highlights lines for the current revision
- hgweb now displays extra information and also navigation links in popups for each line in annotate view
A full overview is available on WhatsNew.
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