which means some fetches of tags that did not fail with older
version of Git will fail without "--force" with this version.
+ * "git help -a" now gives verbose output (same as "git help -av").
+ Those who want the old output may say "git help --no-verbose -a"..
+
+ * "git cpn --help", when "cpn" is an alias to, say, "cherry-pick -n",
+ reported only the alias expansion of "cpn" in earlier versions of
+ Git. It now runs "git cherry-pick --help" to show the manual page
+ of the command, while sending the alias expansion to the standard
+ error stream.
+
+ * "git send-email" learned to grab address-looking string on any
+ trailer whose name ends with "-by". This is a backward-incompatible
+ change. Adding "--suppress-cc=misc-by" on the command line, or
+ setting sendemail.suppresscc configuration variable to "misc-by",
+ can be used to disable this behaviour.
+
Updates since v2.19
-------------------
* The completion script (in contrib/) learned to complete a handful of
options "git stash list" command takes.
+ * The completion script (in contrib/) learned that "git fetch
+ --multiple" only takes remote names as arguments and no refspecs.
+
+ * "git status" learns to show progress bar when refreshing the index
+ takes a long time.
+ (merge ae9af12287 nd/status-refresh-progress later to maint).
+
+ * "git help -a" and "git help -av" give different pieces of
+ information, and generally the "verbose" version is more friendly
+ to the new users. "git help -a" by default now uses the more
+ verbose output (with "--no-verbose", you can go back to the
+ original). Also "git help -av" now lists aliases and external
+ commands, which it did not used to.
+
+ * Unlike "grep", "git grep" by default recurses to the whole tree.
+ The command learned "git grep --recursive" option, so that "git
+ grep --no-recursive" can serve as a synonym to setting the
+ max-depth to 0.
+
+ * When pushing into a repository that borrows its objects from an
+ alternate object store, "git receive-pack" that responds to the
+ push request on the other side lists the tips of refs in the
+ alternate to reduce the amount of objects transferred. This
+ sometimes is detrimental when the number of refs in the alternate
+ is absurdly large, in which case the bandwidth saved in potentially
+ fewer objects transferred is wasted in excessively large ref
+ advertisement. The alternate refs that are advertised are now
+ configurable with a pair of configuration variables.
+
+ * "git cmd --help" when "cmd" is aliased used to only say "cmd is
+ aliased to ...". Now it shows that to the standard error stream
+ and runs "git $cmd --help" where $cmd is the first word of the
+ alias expansion.
+
+ * The documentation of "git gc" has been updated to mention that it
+ is no longer limited to "pruning away crufts" but also updates
+ ancillary files like commit-graph as a part of repository
+ optimization.
+
+ * "git p4 unshelve" improvements.
+
+ * The logic to select the default user name and e-mail on Windows has
+ been improved.
+ (merge 501afcb8b0 js/mingw-default-ident later to maint).
+
+ * The "rev-list --filter" feature learned to exclude all trees via
+ "tree:0" filter.
+
+ * "git send-email" learned to grab address-looking string on any
+ trailer whose name ends with "-by"; --suppress-cc=misc-by on the
+ command line, or setting sendemail.suppresscc configuration
+ variable to "misc-by", can be used to disable this behaviour.
+
+ * Developer builds now uses -Wunused-function compilation option.
+
+ * One of our CI tests to run with "unusual/experimental/random"
+ settings now also uses commit-graph and midx.
+
+ * "git mergetool" learned to take the "--[no-]gui" option, just like
+ "git difftool" does.
+
+ * "git rebase -i" learned a new insn, 'break', that the user can
+ insert in the to-do list. Upon hitting it, the command returns
+ control back to the user.
+
Performance, Internal Implementation, Development Support etc.
point running gc to improve the situation); we used to exit with
failure in such a case.
+ * Various codepaths in the core-ish part learned to work on an
+ arbitrary in-core index structure, not necessarily the default
+ instance "the_index".
+ (merge b3c7eef9b0 nd/the-index later to maint).
+
+ * Code clean-up in the internal machinery used by "git status" and
+ "git commit --dry-run".
+ (merge 73ba5d78b4 ss/wt-status-committable later to maint).
+
+ * Some environment variables that control the runtime options of Git
+ used during tests are getting renamed for consistency.
+ (merge 4231d1ba99 bp/rename-test-env-var later to maint).
+
+ * A new extension to the index file has been introduced, which allows
+ the index file to be read in parallel for performance.
+
+ * The oidset API was built on top of the oidmap API which in turn is
+ on the hashmap API. Replace the implementation to build on top of
+ the khash API and gain performance.
+
+ * Over some transports, fetching objects with an exact commit object
+ name can be done without first seeing the ref advertisements. The
+ code has been optimized to exploit this.
+
+ * In a partial clone that will lazily be hydrated from the
+ originating repository, we generally want to avoid "does this
+ object exist (locally)?" on objects that we deliberately omitted
+ when we created the clone. The cache-tree codepath (which is used
+ to write a tree object out of the index) however insisted that the
+ object exists, even for paths that are outside of the partial
+ checkout area. The code has been updated to avoid such a check.
+
+ * To help developers, an EditorConfig file that attempts to follow
+ the project convention has been added.
+ (merge b548d698a0 bc/editorconfig later to maint).
+
+ * The result of coverage test can be combined with "git blame" to
+ check the test coverage of code introduced recently with a new
+ 'coverage-diff' tool (in contrib/).
+ (merge 783faedd65 ds/coverage-diff later to maint).
+
+ * An experiment to fuzz test a few areas, hopefully we can gain more
+ coverage to various areas.
+
+ * More codepaths are moving away from hardcoded hash sizes.
+
+ * The way the Windows port figures out the current directory has been
+ improved.
+
+ * The way DLLs are loaded on the Windows port has been improved.
+
+ * Some tests have been reorganized and renamed; "ls t/" now gives a
+ better overview of what is tested for these scripts than before.
+
+ * "git rebase" and "git rebase -i" have been reimplemented in C.
+
Fixes since v2.19
-----------------
used for the first run, which has been corrected.
(merge 3e73cc62c0 en/status-multiple-renames-to-the-same-target-fix later to maint).
+ * "git fetch $repo $object" in a partial clone did not correctly
+ fetch the asked-for object that is referenced by an object in
+ promisor packfile, which has been fixed.
+
+ * A corner-case bugfix.
+ (merge c5cbb27cb5 sm/show-superproject-while-conflicted later to maint).
+
+ * Various fixes to "diff --color-moved-ws".
+
+ * A partial clone that is configured to lazily fetch missing objects
+ will on-demand issue a "git fetch" request to the originating
+ repository to fill not-yet-obtained objects. The request has been
+ optimized for requesting a tree object (and not the leaf blob
+ objects contained in it) by telling the originating repository that
+ no blobs are needed.
+ (merge 4c7f9567ea jt/non-blob-lazy-fetch later to maint).
+
+ * The codepath to support the experimental split-index mode had
+ remaining "racily clean" issues fixed.
+ (merge 4c490f3d32 sg/split-index-racefix later to maint).
+
+ * "git log --graph" showing an octopus merge sometimes miscounted the
+ number of display columns it is consuming to show the merge and its
+ parent commits, which has been corrected.
+ (merge 04005834ed np/log-graph-octopus-fix later to maint).
+
+ * "git range-diff" did not work well when the compared ranges had
+ changes in submodules and the "--submodule=log" was used.
+
+ * The implementation of run_command() API on the UNIX platforms had a
+ bug that caused a command not on $PATH to be found in the current
+ directory.
+ (merge f67b980771 jk/run-command-notdot later to maint).
+
+ * A mutex used in "git pack-objects" were not correctly initialized
+ and this caused "git repack" to dump core on Windows.
+ (merge 34204c8166 js/pack-objects-mutex-init-fix later to maint).
+
+ * Under certain circumstances, "git diff D:/a/b/c D:/a/b/d" on
+ Windows would strip initial parts from the paths because they
+ were not recognized as absolute, which has been corrected.
+ (merge ffd04e92e2 js/diff-notice-has-drive-prefix later to maint).
+
+ * The receive.denyCurrentBranch=updateInstead codepath kicked in even
+ when the push should have been rejected due to other reasons, such
+ as it does not fast-forward or the update-hook rejects it, which
+ has been corrected.
+ (merge b072a25fad jc/receive-deny-current-branch-fix later to maint).
+
* Code cleanup, docfix, build fix, etc.
(merge 96a7501aad ts/doc-build-manpage-xsl-quietly later to maint).
(merge b9b07efdb2 tg/conflict-marker-size later to maint).
(merge c56170a0c4 ma/mailing-list-address-in-git-help later to maint).
(merge 6e8fc70fce rs/sequencer-oidset-insert-avoids-dups later to maint).
(merge ad0b8f9575 mw/doc-typofixes later to maint).
+ (merge d9f079ad1a jc/how-to-document-api later to maint).
+ (merge b1492bf315 ma/t7005-bash-workaround later to maint).
+ (merge ac1f98a0df du/rev-parse-is-plumbing later to maint).
+ (merge ca8ed443a5 mm/doc-no-dashed-git later to maint).
+ (merge ce366a8144 du/get-tar-commit-id-is-plumbing later to maint).
+ (merge 61018fe9e0 du/cherry-is-plumbing later to maint).
+ (merge c7e5fe79b9 sb/strbuf-h-update later to maint).
+ (merge 8d2008196b tq/branch-create-wo-branch-get later to maint).
+ (merge 2e3c894f4b tq/branch-style-fix later to maint).
+ (merge c5d844af9c sg/doc-show-branch-typofix later to maint).
+ (merge 081d91618b ah/doc-updates later to maint).
+ (merge b84c783882 jc/cocci-preincr later to maint).
+ (merge 5e495f8122 uk/merge-subtree-doc-update later to maint).
+ (merge aaaa881822 jk/uploadpack-packobjectshook-fix later to maint).