is used as a short-hand for "--create-reflog" and warns about the
future repurposing of the it when it is used.
+ * The userdiff pattern for .php has been updated.
+
+ * The content-transfer-encoding of the message "git send-email" sends
+ out by default was 8bit, which can cause trouble when there is an
+ overlong line to bust RFC 5322/2822 limit. A new option 'auto' to
+ automatically switch to quoted-printable when there is such a line
+ in the payload has been introduced and is made the default.
+
+ * "git checkout" and "git worktree add" learned to honor
+ checkout.defaultRemote when auto-vivifying a local branch out of a
+ remote tracking branch in a repository with multiple remotes that
+ have tracking branches that share the same names.
+ (merge 8d7b558bae ab/checkout-default-remote later to maint).
+
+ * "git grep" learned the "--only-matching" option.
+
+ * "git rebase --rebase-merges" mode now handles octopus merges as
+ well.
+
+ * Add a server-side knob to skip commits in exponential/fibbonacci
+ stride in an attempt to cover wider swath of history with a smaller
+ number of iterations, potentially accepting a larger packfile
+ transfer, instead of going back one commit a time during common
+ ancestor discovery during the "git fetch" transaction.
+ (merge 42cc7485a2 jt/fetch-negotiator-skipping later to maint).
+
+ * A new configuration variable core.usereplacerefs has been added,
+ primarily to help server installations that want to ignore the
+ replace mechanism altogether.
+
+ * Teach "git tag -s" etc. a few configuration variables (gpg.format
+ that can be set to "openpgp" or "x509", and gpg.<format>.program
+ that is used to specify what program to use to deal with the format)
+ to allow x.509 certs with CMS via "gpgsm" to be used instead of
+ openpgp via "gnupg".
+
+ * Many more strings are prepared for l10n.
+
+ * "git p4 submit" learns to ask its own pre-submit hook if it should
+ continue with submitting.
+
Performance, Internal Implementation, Development Support etc.
file, even though it shares the same syntax with configuration
files, to read random configuration items from it.
+ * "git fast-import" has been updated to avoid attempting to create
+ delta against a zero-byte-long string, which is pointless.
+
+ * The codebase has been updated to compile cleanly with -pedantic
+ option.
+ (merge 2b647a05d7 bb/pedantic later to maint).
+
+ * The character display width table has been updated to match the
+ latest Unicode standard.
+ (merge 570951eea2 bb/unicode-11-width later to maint).
+
+ * test-lint now looks for broken use of "VAR=VAL shell_func" in test
+ scripts.
+
+ * Conversion from uchar[40] to struct object_id continues.
+
+ * Recent "security fix" to pay attention to contents of ".gitmodules"
+ while accepting "git push" was a bit overly strict than necessary,
+ which has been adjusted.
+
+ * "git fsck" learns to make sure the optional commit-graph file is in
+ a sane state.
+
+ * "git diff --color-moved" feature has further been tweaked.
+
+ * Code restructuring and a small fix to transport protocol v2 during
+ fetching.
+
+ * Parsing of -L[<N>][,[<M>]] parameters "git blame" and "git log"
+ take has been tweaked.
+
+ * lookup_commit_reference() and friends have been updated to find
+ in-core object for a specific in-core repository instance.
+
+ * Various glitches in the heuristics of merge-recursive strategy have
+ been documented in new tests.
+
+ * "git fetch" learned a new option "--negotiation-tip" to limit the
+ set of commits it tells the other end as "have", to reduce wasted
+ bandwidth and cycles, which would be helpful when the receiving
+ repository has a lot of refs that have little to do with the
+ history at the remote it is fetching from.
+
+ * For a large tree, the index needs to hold many cache entries
+ allocated on heap. These cache entries are now allocated out of a
+ dedicated memory pool to amortize malloc(3) overhead.
+
+ * Tests to cover various conflicting cases have been added for
+ merge-recursive.
+
+ * Tests to cover conflict cases that involve submodules have been
+ added for merge-recursive.
+
+ * Look for broken "&&" chains that are hidden in subshell, many of
+ which have been found and corrected.
+
+ * The singleton commit-graph in-core instance is made per in-core
+ repository instance.
+
+ * "make DEVELOPER=1 DEVOPTS=pedantic" allows developers to compile
+ with -pedantic option, which may catch more problematic program
+ constructs and potential bugs.
+
+ * Preparatory code to later add json output for telemetry data has
+ been added.
+
+ * Update the way we use Coccinelle to find out-of-style code that
+ need to be modernised.
+
+ * It is too easy to misuse system API functions such as strcat();
+ these selected functions are now forbidden in this codebase and
+ will cause a compilation failure.
+
+ * Add a script (in contrib/) to help users of VSCode work better with
+ our codebase.
+
+ * The Travis CI scripts were taught to ship back the test data from
+ failed tests.
+ (merge aea8879a6a sg/travis-retrieve-trash-upon-failure later to maint).
+
Fixes since v2.18
-----------------
not turn a case-incapable filesystem into a case-capable one.
(merge 48294b512a ms/core-icase-doc later to maint).
+ * "fsck.skipList" did not prevent a blob object listed there from
+ being inspected for is contents (e.g. we recently started to
+ inspect the contents of ".gitmodules" for certain malicious
+ patterns), which has been corrected.
+ (merge fb16287719 rj/submodule-fsck-skip later to maint).
+
+ * "git checkout --recurse-submodules another-branch" did not report
+ in which submodule it failed to update the working tree, which
+ resulted in an unhelpful error message.
+ (merge ba95d4e4bd sb/submodule-move-head-error-msg later to maint).
+
+ * "git rebase" behaved slightly differently depending on which one of
+ the three backends gets used; this has been documented and an
+ effort to make them more uniform has begun.
+ (merge b00bf1c9a8 en/rebase-consistency later to maint).
+
+ * The "--ignore-case" option of "git for-each-ref" (and its friends)
+ did not work correctly, which has been fixed.
+ (merge e674eb2528 jk/for-each-ref-icase later to maint).
+
+ * "git fetch" failed to correctly validate the set of objects it
+ received when making a shallow history deeper, which has been
+ corrected.
+ (merge cf1e7c0770 jt/connectivity-check-after-unshallow later to maint).
+
+ * Partial clone support of "git clone" has been updated to correctly
+ validate the objects it receives from the other side. The server
+ side has been corrected to send objects that are directly
+ requested, even if they may match the filtering criteria (e.g. when
+ doing a "lazy blob" partial clone).
+ (merge a7e67c11b8 jt/partial-clone-fsck-connectivity later to maint).
+
+ * Handling of an empty range by "git cherry-pick" was inconsistent
+ depending on how the range ended up to be empty, which has been
+ corrected.
+ (merge c5e358d073 jk/empty-pick-fix later to maint).
+
+ * "git reset --merge" (hence "git merge ---abort") and "git reset --hard"
+ had trouble working correctly in a sparsely checked out working
+ tree after a conflict, which has been corrected.
+ (merge b33fdfc34c mk/merge-in-sparse-checkout later to maint).
+
+ * Correct a broken use of "VAR=VAL shell_func" in a test.
+ (merge 650161a277 jc/t3404-one-shot-export-fix later to maint).
+
+ * "git rev-parse ':/substring'" did not consider the history leading
+ only to HEAD when looking for a commit with the given substring,
+ when the HEAD is detached. This has been fixed.
+ (merge 6b3351e799 wc/find-commit-with-pattern-on-detached-head later to maint).
+
+ * Build doc update for Windows.
+ (merge ede8d89bb1 nd/command-list later to maint).
+
+ * core.commentchar is now honored when preparing the list of commits
+ to replay in "rebase -i".
+
+ * "git pull --rebase" on a corrupt HEAD caused a segfault. In
+ general we substitute an empty tree object when running the in-core
+ equivalent of the diff-index command, and the codepath has been
+ corrected to do so as well to fix this issue.
+ (merge 3506dc9445 jk/has-uncommitted-changes-fix later to maint).
+
+ * httpd tests saw occasional breakage due to the way its access log
+ gets inspected by the tests, which has been updated to make them
+ less flaky.
+ (merge e8b3b2e275 sg/httpd-test-unflake later to maint).
+
+ * Tests to cover more D/F conflict cases have been added for
+ merge-recursive.
+
+ * "git gc --auto" opens file descriptors for the packfiles before
+ spawning "git repack/prune", which would upset Windows that does
+ not want a process to work on a file that is open by another
+ process. The issue has been worked around.
+ (merge 12e73a3ce4 kg/gc-auto-windows-workaround later to maint).
+
+ * The recursive merge strategy did not properly ensure there was no
+ change between HEAD and the index before performing its operation,
+ which has been corrected.
+ (merge 55f39cf755 en/dirty-merge-fixes later to maint).
+
+ * "git rebase" started exporting GIT_DIR environment variable and
+ exposing it to hook scripts when part of it got rewritten in C.
+ Instead of matching the old scripted Porcelains' behaviour,
+ compensate by also exporting GIT_WORK_TREE environment as well to
+ lessen the damage. This can harm existing hooks that want to
+ operate on different repository, but the current behaviour is
+ already broken for them anyway.
+ (merge ab5e67d751 bc/sequencer-export-work-tree-as-well later to maint).
+
+ * "git send-email" when using in a batched mode that limits the
+ number of messages sent in a single SMTP session lost the contents
+ of the variable used to choose between tls/ssl, unable to send the
+ second and later batches, which has been fixed.
+ (merge 636f3d7ac5 jm/send-email-tls-auth-on-batch later to maint).
+
+ * The lazy clone support had a few places where missing but promised
+ objects were not correctly tolerated, which have been fixed.
+
+ * One of the "diff --color-moved" mode "dimmed_zebra" that was named
+ in an unusual way has been deprecated and replaced by
+ "dimmed-zebra".
+ (merge e3f2f5f9cd es/diff-color-moved-fix later to maint).
+
+ * The wire-protocol v2 relies on the client to send "ref prefixes" to
+ limit the bandwidth spent on the initial ref advertisement. "git
+ clone" when learned to speak v2 forgot to do so, which has been
+ corrected.
+ (merge 402c47d939 bw/clone-ref-prefixes later to maint).
+
+ * "git diff --histogram" had a bad memory usage pattern, which has
+ been rearranged to reduce the peak usage.
+ (merge 79cb2ebb92 sb/histogram-less-memory later to maint).
+
+ * Code clean-up to use size_t/ssize_t when they are the right type.
+ (merge 7726d360b5 jk/size-t later to maint).
+
+ * The wire-protocol v2 relies on the client to send "ref prefixes" to
+ limit the bandwidth spent on the initial ref advertisement. "git
+ fetch $remote branch:branch" that asks tags that point into the
+ history leading to the "branch" automatically followed sent to
+ narrow prefix and broke the tag following, which has been fixed.
+ (merge 2b554353a5 jt/tag-following-with-proto-v2-fix later to maint).
+
+ * When the sparse checkout feature is in use, "git cherry-pick" and
+ other mergy operations lost the skip_worktree bit when a path that
+ is excluded from checkout requires content level merge, which is
+ resolved as the same as the HEAD version, without materializing the
+ merge result in the working tree, which made the path appear as
+ deleted. This has been corrected by preserving the skip_worktree
+ bit (and not materializing the file in the working tree).
+ (merge 2b75fb601c en/merge-recursive-skip-fix later to maint).
+
* Code cleanup, docfix, build fix, etc.
(merge aee9be2ebe sg/update-ref-stdin-cleanup later to maint).
(merge 037714252f jc/clean-after-sanity-tests later to maint).
(merge 51d1863168 tz/exclude-doc-smallfixes later to maint).
(merge a9aa3c0927 ds/commit-graph later to maint).
(merge 5cf8e06474 js/enhanced-version-info later to maint).
+ (merge 6aaded5509 tb/config-default later to maint).
+ (merge 022d2ac1f3 sb/blame-color later to maint).
+ (merge 5a06a20e0c bp/test-drop-caches-for-windows later to maint).
+ (merge dd61cc1c2e jk/ui-color-always-to-auto later to maint).
+ (merge 1e83b9bfdd sb/trailers-docfix later to maint).
+ (merge ab29f1b329 sg/fast-import-dump-refs-on-checkpoint-fix later to maint).
+ (merge 6a8ad880f0 jn/subtree-test-fixes later to maint).
+ (merge ffbd51cc60 nd/pack-objects-threading-doc later to maint).
+ (merge e9dac7be60 es/mw-to-git-chain-fix later to maint).
+ (merge fe583c6c7a rs/remote-mv-leakfix later to maint).