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+Git 2.18 Release Notes
+======================
+
+Updates since v2.17
+-------------------
+
+UI, Workflows & Features
+
+ * Rename detection logic in "diff" family that is used in "merge" has
+   learned to guess when all of x/a, x/b and x/c have moved to z/a,
+   z/b and z/c, it is likely that x/d added in the meantime would also
+   want to move to z/d by taking the hint that the entire directory
+   'x' moved to 'z'.  A bug causing dirty files involved in a rename
+   to be overwritten during merge has also been fixed as part of this
+   work.
+
+ * "git filter-branch" learned to use a different exit code to allow
+   the callers to tell the case where there was no new commits to
+   rewrite from other error cases.
+
+ * When built with more recent cURL, GIT_SSL_VERSION can now specify
+   "tlsv1.3" as its value.
+
+ * "git gui" learned that "~/.ssh/id_ecdsa.pub" and
+   "~/.ssh/id_ed25519.pub" are also possible SSH key files.
+   (merge 2e2f0288ef bb/git-gui-ssh-key-files later to maint).
+
+ * "git gui" performs commit upon CTRL/CMD+ENTER but the
+   CTRL/CMD+KP_ENTER (i.e. enter key on the numpad) did not have the
+   same key binding.  It now does.
+   (merge 28a1d94a06 bp/git-gui-bind-kp-enter later to maint).
+
+ * "git gui" has been taught to work with old versions of tk (like
+   8.5.7) that do not support "ttk::style theme use" as a way to query
+   the current theme.
+   (merge 4891961105 cb/git-gui-ttk-style later to maint).
+
+ * "git rebase" has learned to honor "--signoff" option when using
+   backends other than "am" (but not "--preserve-merges").
+
+ * "git branch --list" during an interrupted "rebase -i" now lets
+   users distinguish the case where a detached HEAD is being rebased
+   and a normal branch is being rebased.
+
+ * "git mergetools" learned talking to guiffy.
+
+
+Performance, Internal Implementation, Development Support etc.
+
+ * A "git fetch" from a repository with insane number of refs into a
+   repository that is already up-to-date still wasted too many cycles
+   making many lstat(2) calls to see if these objects at the tips
+   exist as loose objects locally.  These lstat(2) calls are optimized
+   away by enumerating all loose objects beforehand.
+   It is unknown if the new strategy negatively affects existing use
+   cases, fetching into a repository with many loose objects from a
+   repository with small number of refs.
+
+ * Git can be built to use either v1 or v2 of the PCRE library, and so
+   far, the build-time configuration USE_LIBPCRE=YesPlease instructed
+   the build procedure to use v1, but now it means v2.  USE_LIBPCRE1
+   and USE_LIBPCRE2 can be used to explicitly choose which version to
+   use, as before.
+
+ * The build procedure learned to optionally use symbolic links
+   (instead of hardlinks and copies) to install "git-foo" for built-in
+   commands, whose binaries are all identical.
+
+ * Conversion from uchar[20] to struct object_id continues.
+
+ * The way "git worktree prune" worked internally has been simplified,
+   by assuming how "git worktree move" moves an existing worktree to a
+   different place.
+
+ * Code clean-up for the "repository" abstraction.
+   (merge 00a3da2a13 nd/remove-ignore-env-field later to maint).
+
+ * Code to find the length to uniquely abbreviate object names based
+   on packfile content, which is a relatively recent addtion, has been
+   optimized to use the same fan-out table.
+
+ * The mechanism to use parse-options API to automate the command line
+   completion continues to get extended and polished.
+
+ * Copies of old scripted Porcelain commands in contrib/examples/ have
+   been removed.
+
+ * Some tests that rely on the exact hardcoded values of object names
+   have been updated in preparation for hash function migration.
+
+ * Perf-test update.
+
+ * Test helper update.
+
+ * The effort continues to refactor the internal global data structure
+   to make it possible to open multiple repositories, work with and
+   then close them,
+
+ * Small test-helper programs have been consolidated into a single
+   binary.
+
+ * API clean-up around ref-filter code.
+
+ * Shell completion (in contrib) that gives list of paths have been
+   optimized somewhat.
+
+ * The index file is updated to record the fsmonitor section after a
+   full scan was made, to avoid wasting the effort that has already
+   spent.
+
+ * Performance measuring framework in t/perf learned to help bisecting
+   performance regressions.
+
+ * Some multi-word source filenames are being renamed to separate
+   words with dashes instead of underscores.
+
+ * An reusable "memory pool" implementation has been extracted from
+   fast-import.c, which in turn has become the first user of the
+   mem-pool API.
+
+Also contains various documentation updates and code clean-ups.
+
+
+Fixes since v2.17
+-----------------
+
+ * "git shortlog cruft" aborted with a BUG message when run outside a
+   Git repository.  The command has been taught to complain about
+   extra and unwanted arguments on its command line instead in such a
+   case.
+   (merge 4aa0161e83 ma/shortlog-revparse later to maint).
+
+ * "git stash push -u -- <pathspec>" gave an unnecessary and confusing
+   error message when there was no tracked files that match the
+   <pathspec>, which has been fixed.
+   (merge 353278687e tg/stash-untracked-with-pathspec-fix later to maint).
+
+ * "git tag --contains no-such-commit" gave a full list of options
+   after giving an error message.
+   (merge 3bb0923f06 ps/contains-id-error-message later to maint).
+
+ * "diff-highlight" filter (in contrib/) learned to undertand "git log
+   --graph" output better.
+   (merge 4551fbba14 jk/diff-highlight-graph-fix later to maint).
+
+ * when refs that do not point at committish are given, "git
+   filter-branch" gave a misleading error messages.  This has been
+   corrected.
+   (merge f78ab355e7 yk/filter-branch-non-committish-refs later to maint).
+
+ * "git submodule status" misbehaved on a submodule that has been
+   removed from the working tree.
+   (merge 74b6bda32f rs/status-with-removed-submodule later to maint).
+
+ * When credential helper exits very quickly without reading its
+   input, it used to cause Git to die with SIGPIPE, which has been
+   fixed.
+   (merge a0d51e8d0e eb/cred-helper-ignore-sigpipe later to maint).
+
+ * "git rebase --keep-empty" still removed an empty commit if the
+   other side contained an empty commit (due to the "does an
+   equivalent patch exist already?" check), which has been corrected.
+   (merge 3d946165e1 pw/rebase-keep-empty-fixes later to maint).
+
+ * Some codepaths, including the refs API, get and keep relative
+   paths, that go out of sync when the process does chdir(2).  The
+   chdir-notify API is introduced to let these codepaths adjust these
+   cached paths to the new current directory.
+   (merge fb9c2d2703 jk/relative-directory-fix later to maint).
+
+ * "cd sub/dir && git commit ../path" ought to record the changes to
+   the file "sub/path", but this regressed long time ago.
+   (merge 86238e07ef bw/commit-partial-from-subdirectory-fix later to maint).
+
+ * Recent introduction of "--log-destination" option to "git daemon"
+   did not work well when the daemon was run under "--inetd" mode.
+   (merge e67d906d73 lw/daemon-log-destination later to maint).
+
+ * Small fix to the autoconf build procedure.
+   (merge 249482daf0 es/fread-reads-dir-autoconf-fix later to maint).
+
+ * Fix an unexploitable (because the oversized contents are not under
+   attacker's control) buffer overflow.
+   (merge d8579accfa bp/fsmonitor-bufsize-fix later to maint).
+
+ * Other minor doc, test and build updates and code cleanups.
+   (merge 248f66ed8e nd/trace-with-env later to maint).
+   (merge 14ced5562c ys/bisect-object-id-missing-conversion-fix later to maint).
+   (merge 5988eb631a ab/doc-hash-brokenness later to maint).
+   (merge a4d4e32a70 pk/test-avoid-pipe-hiding-exit-status later to maint).
+   (merge 05e293c1ac jk/flockfile-stdio later to maint).
+   (merge e9184b0789 jk/t5561-missing-curl later to maint).
+   (merge b1801b85a3 nd/worktree-move later to maint).
+   (merge bbd374dd20 ak/bisect-doc-typofix later to maint).
+   (merge 4855f06fb3 mn/send-email-credential-doc later to maint).
+   (merge 8523b1e355 en/doc-typoes later to maint).
+   (merge 43b44ccfe7 js/t5404-path-fix later to maint).
+   (merge decf711fc1 ps/test-chmtime-get later to maint).
+   (merge 22d11a6e8e es/worktree-docs later to maint).
+   (merge 92a5dbbc22 tg/use-git-contacts later to maint).