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+Git 2.22 Release Notes
+Updates since v2.21
+UI, Workflows & Features
+ * "git checkout --no-overlay" can be used to trigger a new mode of
+ checking out paths out of the tree-ish, that allows paths that
+ match the pathspec that are in the current index and working tree
+ and are not in the tree-ish.
+ * The %(trailers) formatter in "git log --format=..." now allows to
+ optionally pick trailers selectively by keyword, show only values,
+ etc.
+ * Four new configuration variables {author,committer}.{name,email}
+ have been introduced to override user.{name,email} in more specific
+ cases.
+ * Command-line completion (in contrib/) learned to tab-complete the
+ "git submodule absorbgitdirs" subcommand.
+ * "git branch" learned a new subcommand "--show-current".
+ * Output from "diff --cc" did not show the original paths when the
+ merge involved renames. A new option adds the paths in the
+ original trees to the output.
+ * The command line completion (in contrib/) has been taught to
+ complete more subcommand parameters.
+ * The final report from "git bisect" used to show the suspected
+ culprit using a raw "diff-tree", with which there is no output for
+ a merge commit. This has been updated to use a more modern and
+ human readable output that still is concise enough.
+ * "git rebase --rebase-merges" replaces its old "--preserve-merges"
+ option; the latter is now marked as deprecated.
+ * Error message given while cloning with --recurse-submodules has
+ been updated.
+ * The completion helper code now pays attention to repository-local
+ configuration (when available), which allows --list-cmds to honour
+ a repository specific setting of completion.commands, for example.
+ * "git mergetool" learned to offer Sublime Merge (smerge) as one of
+ its backends.
+Performance, Internal Implementation, Development Support etc.
+ * The diff machinery, one of the oldest parts of the system, which
+ long predates the parse-options API, uses fairly long and complex
+ handcrafted option parser. This is being rewritten to use the
+ parse-options API.
+ * The implementation of pack-redundant has been updated for
+ performance in a repository with many packfiles.
+ * A more structured way to obtain execution trace has been added.
+ * "git prune" has been taught to take advantage of reachability
+ bitmap when able.
+ * The command line parser of "git commit-tree" has been rewritten to
+ use the parse-options API.
+ * Suggest GitGitGadget instead of submitGit as a way to submit
+ patches based on GitHub PR to us.
+ * The test framework has been updated to help developers by making it
+ easier to run most of the tests under different versions of
+ over-the-wire protocols.
+ * Dev support update to make it easier to compare two formatted
+ results from our documentation.
+ * The scripted "git rebase" implementation has been retired.
+ * "git multi-pack-index verify" did not scale well with the number of
+ packfiles, which is being improved.
+ * "git stash" has been rewritten in C.
+ * The "check-docs" Makefile target to support developers has been
+ updated.
+ * The tests have been updated not to rely on the abbreviated option
+ names the parse-options API offers, to protect us from an
+ abbreviated form of an option that used to be unique within the
+ command getting non-unique when a new option that share the same
+ prefix is added.
+Fixes since v2.21
+ * "git prune-packed" did not notice and complain against excess
+ arguments given from the command line, which now it does.
+ (merge 9b0bd87ed2 rj/prune-packed-excess-args later to maint).
+ * Split-index fix.
+ (merge 6e37c8ed3c nd/split-index-null-base-fix later to maint).
+ * "git diff --no-index" may still want to access Git goodies like
+ --ext-diff and --textconv, but so far these have been ignored,
+ which has been corrected.
+ (merge 287ab28bfa jk/diff-no-index-initialize later to maint).
+ * Unify RPC code for smart http in protocol v0/v1 and v2, which fixes
+ a bug in the latter (lack of authentication retry) and generally
+ improves the code base.
+ (merge a97d00799a jt/http-auth-proto-v2-fix later to maint).
+ * The include file compat/bswap.h has been updated so that it is safe
+ to (accidentally) include it more than once.
+ (merge 33aa579a55 jk/guard-bswap-header later to maint).
+ * The set of header files used by "make hdr-check" unconditionally
+ included sha256/gcrypt.h, even when it is not used, causing the
+ make target to fail. We now skip it when GCRYPT_SHA256 is not in
+ use.
+ (merge f23aa18e7f rj/hdr-check-gcrypt-fix later to maint).
+ * The Makefile uses 'find' utility to enumerate all the *.h header
+ files, which is expensive on platforms with slow filesystems; it
+ now optionally uses "ls-files" if working within a repository,
+ which is a trick similar to how all sources are enumerated to run
+ ETAGS on.
+ (merge 92b88eba9f js/find-lib-h-with-ls-files-when-possible later to maint).
+ * "git rebase" that was reimplemented in C did not set ORIG_HEAD
+ correctly, which has been corrected.
+ (merge cbd29ead92 js/rebase-orig-head-fix later to maint).
+ * Dev support.
+ (merge f545737144 js/stress-test-ui-tweak later to maint).
+ * CFLAGS now can be tweaked when invoking Make while using
+ DEVELOPER=YesPlease; this did not work well before.
+ (merge 6d5d4b4e93 ab/makefile-help-devs-more later to maint).
+ * "git fsck --connectivity-only" omits computation necessary to sift
+ the objects that are not reachable from any of the refs into
+ unreachable and dangling. This is now enabled when dangling
+ objects are requested (which is done by default, but can be
+ overridden with the "--no-dangling" option).
+ (merge 8d8c2a5aef jk/fsck-doc later to maint).
+ * On platforms where "git fetch" is killed with SIGPIPE (e.g. OSX),
+ the upload-pack that runs on the other end that hangs up after
+ detecting an error could cause "git fetch" to die with a signal,
+ which led to a flakey test. "git fetch" now ignores SIGPIPE during
+ the network portion of its operation (this is not a problem as we
+ check the return status from our write(2)s).
+ (merge 143588949c jk/no-sigpipe-during-network-transport later to maint).
+ * A recent update broke "is this object available to us?" check for
+ well-known objects like an empty tree (which should yield "yes",
+ even when there is no on-disk object for an empty tree), which has
+ been corrected.
+ (merge f06ab027ef jk/virtual-objects-do-exist later to maint).
+ * The setup code has been cleaned up to avoid leaks around the
+ repository_format structure.
+ (merge e8805af1c3 ma/clear-repository-format later to maint).
+ * "git config --type=color ..." is meant to replace "git config --get-color"
+ but there is a slight difference that wasn't documented, which is
+ now fixed.
+ (merge cd8e7593b9 jk/config-type-color-ends-with-lf later to maint).
+ * When the "clean" filter can reduce the size of a huge file in the
+ working tree down to a small "token" (a la Git LFS), there is no
+ point in allocating a huge scratch area upfront, but the buffer is
+ sized based on the original file size. The convert mechanism now
+ allocates very minimum and reallocates as it receives the output
+ from the clean filter process.
+ (merge 02156ab031 jh/resize-convert-scratch-buffer later to maint).
+ * "git rebase" uses the refs/rewritten/ hierarchy to store its
+ intermediate states, which inherently makes the hierarchy per
+ worktree, but it didn't quite work well.
+ (merge b9317d55a3 nd/rewritten-ref-is-per-worktree later to maint).
+ * "git log -L<from>,<to>:<path>" with "-s" did not suppress the patch
+ output as it should. This has been corrected.
+ (merge 05314efaea jk/line-log-with-patch later to maint).
+ * "git worktree add" used to do a "find an available name with stat
+ and then mkdir", which is race-prone. This has been fixed by using
+ mkdir and reacting to EEXIST in a loop.
+ (merge 7af01f2367 ms/worktree-add-atomic-mkdir later to maint).
+ * Build update for SHA-1 with collision detection.
+ (merge 07a20f569b jk/sha1dc later to maint).
+ * Build procedure has been fixed around use of asciidoctor instead of
+ asciidoc.
+ (merge 185f9a0ea0 ma/asciidoctor-fixes later to maint).
+ * remote-http transport did not anonymize URLs reported in its error
+ messages at places.
+ (merge c1284b21f2 js/anonymize-remote-curl-diag later to maint).
+ * Error messages given from the http transport have been updated so
+ that they can be localized.
+ (merge ed8b4132c8 js/remote-curl-i18n later to maint).
+ * "git init" forgot to read platform-specific repository
+ configuration, which made Windows port to ignore settings of
+ core.hidedotfiles, for example.
+ * A corner-case object name ambiguity while the sequencer machinery
+ is working (e.g. "rebase -i -x") has been fixed.
+ * "git format-patch" did not diagnose an error while opening the
+ output file for the cover-letter, which has been corrected.
+ (merge 2fe95f494c jc/format-patch-error-check later to maint).
+ * "git checkout -f <branch>" while the index has an unmerged path
+ incorrectly left some paths in an unmerged state, which has been
+ corrected.
+ * A corner case bug in the refs API has been corrected.
+ (merge d3322eb28b jk/refs-double-abort later to maint).
+ * Unicode update.
+ (merge 584b62c37b bb/unicode-12 later to maint).
+ * dumb-http walker has been updated to share more error recovery
+ strategy with the normal codepath.
+ * A buglet in configuration parser has been fixed.
+ (merge 19e7fdaa58 nd/include-if-wildmatch later to maint).
+ * The documentation for "git read-tree --reset -u" has been updated.
+ (merge b5a0bd694c nd/read-tree-reset-doc later to maint).
+ * Code cleanup, docfix, build fix, etc.
+ (merge 11f470aee7 jc/test-yes-doc later to maint).
+ (merge 90503a240b js/doc-symref-in-proto-v1 later to maint).
+ (merge 5c326d1252 jk/unused-params later to maint).
+ (merge 68cabbfda3 dl/doc-submodule-wo-subcommand later to maint).
+ (merge 9903623761 ab/receive-pack-use-after-free-fix later to maint).
+ (merge 1ede45e44b en/merge-options-doc later to maint).
+ (merge 3e14dd2c8e rd/doc-hook-used-in-sample later to maint).
+ (merge c271dc28fd nd/no-more-check-racy later to maint).
+ (merge e6e15194a8 yb/utf-16le-bom-spellfix later to maint).
+ (merge bb101aaf0c rd/attr.c-comment-typofix later to maint).
+ (merge 716a5af812 rd/gc-prune-doc-fix later to maint).
+ (merge 50b206371d js/untravis-windows later to maint).
+ (merge dbf47215e3 js/rebase-recreate-merge later to maint).
+ (merge 56cb2d30f8 dl/reset-doc-no-wrt-abbrev later to maint).
+ (merge 64eca306a2 ja/dir-rename-doc-markup-fix later to maint).
+ (merge af91b0230c dl/ignore-docs later to maint).
+ (merge 59a06e947b ra/t3600-test-path-funcs later to maint).
+ (merge e041d0781b ar/t4150-remove-cruft later to maint).
+ (merge 8d75a1d183 ma/asciidoctor-fixes-more later to maint).
+ (merge 74cc547b0f mh/pack-protocol-doc-fix later to maint).
+ (merge ed31851fa6 ab/doc-misc-typofixes later to maint).
+ (merge a7256debd4 nd/checkout-m-doc-update later to maint).
+ (merge 3a9e1ad78d jt/t5551-protocol-v2-does-not-have-half-auth later to maint).
+ (merge 0b918b75af sg/t5318-cleanup later to maint).
+ (merge 68ed71b53c cb/doco-mono later to maint).
+ (merge a34dca2451 nd/interpret-trailers-docfix later to maint).