relnotes: update release notes for upcoming 5.9.3

Differential Revision: https://phab.mercurial-scm.org/D11720

relnotes/5.9

@@ -1,86 +1,90 b''
 == New Features ==
 
  * `hg config` now has a `--source` option to show where each
    configuration value comes from.
  * Introduced a command (debug-repair-issue6533) to repair repositories affected
    by issue6528 where certain files would show up as modified even if they were
    clean due to an issue in the copy-tracing code.
 
 == Default Format Change ==
 
 These changes affect newly created repositories (or new clone) done with
 Mercurial 5.9.
 
 
 == New Experimental Features ==
 
  * A `changelogv2` format has been introduced. It is not ready for use yet, but
    will be used later to address some of the weaknesses of the current revlog
    format.
  * Initial experiment and support for `dirstatev2`, a new dirstate format that
    addresses some of the weaknesses of the current dirstate format. Python + C
    and Rust support are being implemented, but the Rust solution is the one
    currently getting the attention for performance.
  * Initial support for `rhg status`. `rhg` is the Rust wrapper executable for hg
    that shortcuts some commands for faster execution speed.
 
 == Bug Fixes ==
 
+ * Fixed committing empty files with `narrow`
+ * Allow overriding `pip`'s pep517 compliance to build C or Rust extensions
+ * Fixed regression on outgoing email when not specifying revisions
+ * Fixed a regression causing bookmarks to disappear when using Rust persistent nodemap
  * Fixed a regression (in 5.9.1) introduced in 5.9 when cloning repos with
    deep filenames
  * Fixed detection of directories becoming symlinks, but only when using the
    Rust extensions.
  * Fixed ignore and include not composing in the Rust status
  * `hg commit --interactive` now handles deselecting edits of a rename
  * Fixed a case where `hg evolve` gives different results when interrupted
  * Fixed a memory leak in phases computation
  * `histedit` and `shelve` don't swallow errors when updating the working copy
    anymore
  * Improve error message when detecting content-divergence with a hidden
    common predecessor
  * No longer re-order parents in filelog, see issue6533
  * Fix revisions affected by issue6533 on the fly during exchange
  * Many Windows fixes for stability and py3 compatibility improvements
  * Many other miscellaneous fixes
 
 == Backwards Compatibility Changes ==
 
 
 == Internal API Changes ==
 
 The Dirstate API have been updated as the previous function leaked some
 internal details and did not distinguish between two important cases: "We are
 changing parent and need to adjust the dirstate" and "some command is changing
 which file is tracked". To clarify the situation:
 
 * the following functions have been deprecated,
 
   - `dirstate.add`,
   - `dirstate.normal`,
   - `dirstate.normallookup`,
   - `dirstate.merge`,
   - `dirstate.otherparent`,
   - `dirstate.remove`,
   - `dirstate.drop`,
   - `dirstateitem.__getitem__`,
 
 * these new functions are added for the "adjusting parents" use-case:
 
   - `dirstate.update_file`,
   - `dirstate.update_file_p1`,
 
 * these new function are added for the "adjusting wc file" use-case":
 
   - `dirstate.set_tracked`,
   - `dirstate.set_untracked`,
   - `dirstate.set_clean`,
   - `dirstate.set_possibly_dirty`,
 
 See inline documentation of the new functions for details.
 
 * Additionally, the following have been deprecated:
   - `urlutil.getpath` function
   - `localrepository.updatecaches`' `full` argument
 
 * The following have been removed:
   - `revlog.revlogio` has been removed