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Git v2.51 Release Notes
=======================
UI, Workflows & Features
------------------------
* Userdiff patterns for the R language have been added.
* Documentation for "git send-email" has been updated with a bit more
credential helper and OAuth information.
* "git cat-file --batch" learns to understand %(objectmode) atom to
allow the caller to tell missing objects (due to repository
corruption) and submodules (whose commit objects are OK to be
missing) apart.
* "git diff --no-index dirA dirB" can limit the comparison with
pathspec at the end of the command line, just like normal "git
diff".
* "git subtree" (in contrib/) learned to grok GPG signing its commits.
* "git whatchanged" that is longer to type than "git log --raw"
which is its modern rough equivalent has outlived its usefulness
more than 10 years ago. Plan to deprecate and remove it.
* An interchange format for stash entries is defined, and subcommand
of "git stash" to import/export has been added.
* "git merge/pull" has been taught the "--compact-summary" option to
use the compact-summary format, intead of diffstat, when showing
the summary of the incoming changes.
* "git imap-send" has been broken for a long time, which has been
resurrected and then taught to talk OAuth2.0 etc.
* Some error messages from "git imap-send" has been updated.
* When "git daemon" sees a signal while attempting to accept() a new
client, instead of retrying, it skipped it by mistake, which has
been corrected.
Performance, Internal Implementation, Development Support etc.
--------------------------------------------------------------
* "git pack-objects" learned to find delta bases from blobs at the
same path, using the --path-walk API.
* CodingGuidelines update.
* Add settings for Solaris 10 & 11.
* Meson-based build/test framework now understands TAP output
generated by our tests.
* "Do not explicitly initialize to zero" rule has been clarified in
the CodingGuidelines document.
* A test helper "test_seq" function learned the "-f <fmt>" option,
which allowed us to simplify a lot of test scripts.
* A lot of stale stuff has been removed from the contrib/ hierarchy.
* "git push" and "git fetch" are taught to update refs in batches to
gain performance.
Fixes since v2.50
-----------------
Unless otherwise noted, all the changes in 2.50.X maintenance track,
including security updates, are included in this release.
* A memory-leak in an error code path has been plugged.
(merge 7082da85cb ly/commit-graph-graph-write-leakfix later to maint).
* A memory-leak in an error code path has been plugged.
(merge aedebdb6b9 ly/fetch-pack-leakfix later to maint).
* Some leftover references to documentation source files that no
longer exist, due to recent ".txt" -> ".adoc" renaming, have been
corrected.
(merge 3717a5775a jw/doc-txt-to-adoc-refs later to maint).
* "git stash -p <pathspec>" improvements.
(merge 468817bab2 pw/stash-p-pathspec-fixes later to maint).
* "git send-email" incremented its internal message counter when a
message was edited, which made logic that treats the first message
specially misbehave, which has been corrected.
(merge 2cc27b3501 ag/send-email-edit-threading-fix later to maint).
* "git stash" recorded a wrong branch name when submodules are
present in the current checkout, which has been corrected.
(merge ffb36c64f2 kj/stash-onbranch-submodule-fix later to maint).
* When asking to apply mailmap to both author and committer field
while showing a commit object, the field that appears later was not
correctly parsed and replaced, which has been corrected.
(merge abf94a283f sa/multi-mailmap-fix later to maint).
* "git maintenance" lacked the care "git gc" had to avoid holding
onto the repository lock for too long during packing refs, which
has been remedied.
(merge 1b5074e614 ps/maintenance-ref-lock later to maint).
* Avoid regexp_constraint and instead use comparison_constraint when
listing functions to exclude from application of coccinelle rules,
as spatch can be built with different regexp engine X-<.
(merge f2ad545813 jc/cocci-avoid-regexp-constraint later to maint).
* Updating submodules from the upstream did not work well when
submodule's HEAD is detached, which has been improved.
(merge ca62f524c1 jk/submodule-remote-lookup-cleanup later to maint).
* Remove unnecessary check from "git daemon" code.
(merge 0c856224d2 cb/daemon-fd-check-fix later to maint).
* Leakfix.
(merge b0e9d25865 jk/fix-leak-send-pack later to maint).
* Other code cleanup, docfix, build fix, etc.
(merge b257adb571 lo/my-first-ow-doc-update later to maint).
(merge 8b34b6a220 ly/sequencer-update-squash-is-fixup-only later to maint).
(merge 5dceb8bd05 ly/do-not-localize-bug-messages later to maint).
(merge 61372dd613 ly/commit-buffer-reencode-leakfix later to maint).
(merge 81cd1eef7d ly/pack-bitmap-root-leakfix later to maint).
(merge bfc9f9cc64 ly/submodule-update-failure-leakfix later to maint).
(merge 65dff89c6b ma/doc-diff-cc-headers later to maint).
(merge efb61591ee jm/bundle-uri-debug-output-to-fp later to maint).
(merge a3d278bb64 ly/prepare-show-merge-leakfix later to maint).
(merge 1fde1c5daf ac/preload-index-wo-the-repository later to maint).
(merge 855cfc65ae rm/t2400-modernize later to maint).
(merge 2939494284 ly/run-builtin-use-passed-in-repo later to maint).
(merge ff73f375bb jg/mailinfo-leakfix later to maint).
(merge 996f14c02b jj/doc-branch-markup-fix later to maint).
(merge 1e77de1864 cb/ci-freebsd-update-to-14.3 later to maint).
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