Git 2.19 Release Notes
======================

Updates since v2.18
-------------------

UI, Workflows & Features

 * "git diff" compares the index and the working tree.  For paths
   added with intent-to-add bit, the command shows the full contents
   of them as added, but the paths themselves were not marked as new
   files.  They are now shown as new by default.

   "git apply" learned the "--intent-to-add" option so that an
   otherwise working-tree-only application of a patch will add new
   paths to the index marked with the "intent-to-add" bit.

 * "git grep" learned the "--column" option that gives not just the
   line number but the column number of the hit.

 * The "-l" option in "git branch -l" is an unfortunate short-hand for
   "--create-reflog", but many users, both old and new, somehow expect
   it to be something else, perhaps "--list".  This step warns when "-l"
   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.


Performance, Internal Implementation, Development Support etc.

 * The bulk of "git submodule foreach" has been rewritten in C.

 * The in-core "commit" object had an all-purpose "void *util" field,
   which was tricky to use especially in library-ish part of the
   code.  All of the existing uses of the field has been migrated to a
   more dedicated "commit-slab" mechanism and the field is eliminated.

 * A less often used command "git show-index" has been modernized.
   (merge fb3010c31f jk/show-index later to maint).

 * The conversion to pass "the_repository" and then "a_repository"
   throughout the object access API continues.

 * Continuing with the idea to programatically enumerate various
   pieces of data required for command line completion, teach the
   codebase to report the list of configuration variables
   subcommands care about to help complete them.

 * Separate "rebase -p" codepath out of "rebase -i" implementation to
   slim down the latter and make it easier to manage.

 * Make refspec parsing codepath more robust.

 * Some flaky tests have been fixed.

 * Continuing with the idea to programmatically enumerate various
   pieces of data required for command line completion, the codebase
   has been taught to enumerate options prefixed with "--no-" to
   negate them.

 * Build and test procedure for netrc credential helper (in contrib/)
   has been updated.

 * The conversion to pass "the_repository" and then "a_repository"
   throughout the object access API continues.

 * Remove unused function definitions and declarations from ewah
   bitmap subsystem.

 * Code preparation to make "git p4" closer to be usable with Python 3.

 * Tighten the API to make it harder to misuse in-tree .gitmodules
   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.


Fixes since v2.18
-----------------

 * "git remote update" can take both a single remote nickname and a
   nickname for remote groups, and the completion script (in contrib/)
   has been taught about it.
   (merge 9cd4382ad5 ls/complete-remote-update-names later to maint).

 * "git fetch --shallow-since=<cutoff>" that specifies the cut-off
   point that is newer than the existing history used to end up
   grabbing the entire history.  Such a request now errors out.
   (merge e34de73c56 nd/reject-empty-shallow-request later to maint).

 * Fix for 2.17-era regression around `core.safecrlf`.
   (merge 6cb09125be as/safecrlf-quiet-fix later to maint).

 * The recent addition of "partial clone" experimental feature kicked
   in when it shouldn't, namely, when there is no partial-clone filter
   defined even if extensions.partialclone is set.
   (merge cac1137dc4 jh/partial-clone later to maint).

 * "git send-pack --signed" (hence "git push --signed" over the http
   transport) did not read user ident from the config mechanism to
   determine whom to sign the push certificate as, which has been
   corrected.
   (merge d067d98887 ms/send-pack-honor-config later to maint).

 * "git fetch-pack --all" used to unnecessarily fail upon seeing an
   annotated tag that points at an object other than a commit.
   (merge c12c9df527 jk/fetch-all-peeled-fix later to maint).

 * When user edits the patch in "git add -p" and the user's editor is
   set to strip trailing whitespaces indiscriminately, an empty line
   that is unchanged in the patch would become completely empty
   (instead of a line with a sole SP on it).  The code introduced in
   Git 2.17 timeframe failed to parse such a patch, but now it learned
   to notice the situation and cope with it.
   (merge f4d35a6b49 pw/add-p-recount later to maint).

 * The code to try seeing if a fetch is necessary in a submodule
   during a fetch with --recurse-submodules got confused when the path
   to the submodule was changed in the range of commits in the
   superproject, sometimes showing "(null)".  This has been corrected.

 * "git submodule" did not correctly adjust core.worktree setting that
   indicates whether/where a submodule repository has its associated
   working tree across various state transitions, which has been
   corrected.
   (merge 984cd77ddb sb/submodule-core-worktree later to maint).

 * Bugfix for "rebase -i" corner case regression.
   (merge a9279c6785 pw/rebase-i-keep-reword-after-conflict later to maint).

 * Recently added "--base" option to "git format-patch" command did
   not correctly generate prereq patch ids.
   (merge 15b76c1fb3 xy/format-patch-prereq-patch-id-fix later to maint).

 * POSIX portability fix in Makefile to fix a glitch introduced a few
   releases ago.
   (merge 6600054e9b dj/runtime-prefix later to maint).

 * "git filter-branch" when used with the "--state-branch" option
   still attempted to rewrite the commits whose filtered result is
   known from the previous attempt (which is recorded on the state
   branch); the command has been corrected not to waste cycles doing
   so.
   (merge 709cfe848a mb/filter-branch-optim later to maint).

 * Clarify that setting core.ignoreCase to deviate from reality would
   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".

 * 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 5b26c3c941 en/merge-recursive-cleanup later to maint).
   (merge 0dcbc0392e bw/config-refer-to-gitsubmodules-doc later to maint).
   (merge bb4d000e87 bw/protocol-v2 later to maint).
   (merge 928f0ab4ba vs/typofixes later to maint).
   (merge d7f590be84 en/rebase-i-microfixes later to maint).
   (merge 81d395cc85 js/rebase-recreate-merge 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).