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Git v2.39 Release Notes
=======================
UI, Workflows & Features
------------------------
* "git grep" learned to expand the sparse-index more lazily and on
demand in a sparse checkout.
* By default, use of fsmonitor on a repository on networked
filesystem is disabled. Add knobs to make it workable on macOS.
* After checking out a "branch" that is a symbolic-ref that points at
another branch, "git symbolic-ref HEAD" reports the underlying
branch, not the symbolic-ref the user gave checkout as argument.
The command learned the "--no-recurse" option to stop after
dereferencing a symbolic-ref only once.
* "git branch --edit-description @{-1}" is now a way to edit branch
description of the branch you were on before switching to the
current branch.
Performance, Internal Implementation, Development Support etc.
--------------------------------------------------------------
* With a bit of header twiddling, use the native regexp library on
macOS instead of the compat/ one.
* Prepare for GNU [ef]grep that throw warning of their uses.
* Sources related to fuzz testing have been moved down to their own
directory.
* Most credential helpers ignored unknown entries in a credential
description, but a few died upon seeing them. The latter were
taught to ignore them, too
* "scalar unregister" in a repository that is already been
unregistered reported an error.
* Remove error detection from a function that fetches from promisor
remotes, and make it die when such a fetch fails to bring all the
requested objects, to give an early failure to various operations.
* Update CodingGuidelines to clarify what features to use and avoid
in C99.
* Avoid false-positive from LSan whose assumption may be broken with
higher optimization levels.
* Enable address and undefined sanitizer tasks at GitHub Actions CI.
* More UNUSED annotation to help using -Wunused option with the
compiler.
(merge 4b992f0a24 jk/unused-anno-more later to maint).
Fixes since v2.38
-----------------
* The codepath that reads from the index v4 had unaligned memory
accesses, which has been corrected.
* Fix messages incorrectly marked for translation.
* "git fsck" failed to release contents of tree objects already used
from the memory, which has been fixed.
* "git clone" did not like to see the "--bare" and the "--origin"
options used together without a good reason.
* "git remote rename" failed to rename a remote without fetch
refspec, which has been corrected.
* Documentation on various Boolean GIT_* environment variables have
been clarified.
* "git rebase -i" can mistakenly attempt to apply a fixup to a commit
itself, which has been corrected.
* "git multi-pack-index repack/expire" used to repack unreachable
cruft into a new pack, which have been corrected.
* In read-only repositories, "git merge-tree" tried to come up with a
merge result tree object, which it failed (which is not wrong) and
led to a segfault (which is bad), which has been corrected.
* Force C locale while running tests around httpd to make sure we can
find expected error messages in the log.
* Fix a logic in "mailinfo -b" that miscomputed the length of a
substring, which lead to an out-of-bounds access.
* The codepath to sign learned to report errors when it fails to read
from "ssh-keygen".
* Code clean-up that results in plugging a leak.
* "GIT_EDITOR=: git branch --edit-description" resulted in failure,
which has been corrected.
* The code to clean temporary object directories (used for
quarantine) tried to remove them inside its signal handler, which
was a no-no.
* Update comment in the Makefile about the RUNTIME_PREFIX config knob.
* Clarify that "the sentence after <area>: prefix does not begin with
a capital letter" rule applies only to the commit title.
* "git branch --edit-description" on an unborh branch misleadingly
said that no such branch exists, which has been corrected.
* Work around older clang that warns against C99 zero initialization
syntax for struct.
* Giving "--invert-grep" and "--all-match" without "--grep" to the
"git log" command resulted in an attempt to access grep pattern
expression structure that has not been allocated, which has been
corrected.
(merge db84376f98 ab/grep-simplify-extended-expression later to maint).
* "git diff rev^!" did not show combined diff to go to the rev from
its parents.
(merge a79c6b6081 rs/diff-caret-bang-with-parents later to maint).
* Allow configuration files in "protected" scopes to include other
configuration files.
(merge ecec57b3c9 gc/bare-repo-discovery later to maint).
* Give a bit more diversity to macOS CI by using sha1dc in one of the
jobs (the other one tests Apple Common Crypto).
(merge 1ad5c3df35 jc/ci-osx-with-sha1dc later to maint).
* A bugfix with tracing support in midx codepath
(merge e9c3839944 tb/midx-bitmap-selection-fix later to maint).
* When geometric repacking feature is in use together with the
--pack-kept-objects option, we lost packs marked with .keep files.
(merge 197443e80a tb/save-keep-pack-during-geometric-repack later to maint).
* Move a global variable added as a hack during regression fixes to
its proper place in the API.
(merge 0b0ab95f17 ab/run-hook-api-cleanup later to maint).
* Update to build procedure with VS using CMake/CTest.
(merge c858750b41 js/cmake-updates later to maint).
* The short-help text shown by "git cmd -h" and the synopsis text
shown at the beginning of "git help cmd" have been made more
consistent.
* When creating a multi-pack bitmap, remove per-pack bitmap files
unconditionally as they will never be consulted.
(merge 55d902cd61 tb/remove-unused-pack-bitmap later to maint).
* Fix a longstanding syntax error in Git.pm error codepath.
* "git diff --stat" etc. were invented back when everything was ASCII
and strlen() was a way to measure the display width of a string;
adjust them to compute the display width assuming UTF-8 pathnames.
(merge ce8529b2bb tb/diffstat-with-utf8-strwidth later to maint).
* Other code cleanup, docfix, build fix, etc.
(merge 413bc6d20a ds/cmd-main-reorder later to maint).
(merge 8d2863e4ed nw/t1002-cleanup later to maint).
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