Log message:
jj: update to 0.27.0.

## [0.27.0] - 2025-03-05

### Release highlights

* `git.subprocess` is now enabled by default, improving compatibility with Git
  fetches and pushes by spawning an external `git` process. Users can opt out
  of this by setting `git.subprocess = false`, but this will likely be removed
  in a future release. Please report any issues you run into.

### Breaking changes

* Bookmark name to be created/updated is now parsed as [a revset
  symbol](docs/revsets.md#symbols). Quotation may be needed in addition to shell
  quotes. Example: `jj bookmark create -r@- "'name with space'"`

* `jj bookmark create`, `jj bookmark set` and `jj bookmark move` onto a hidden
   commit make it visible.

* `jj bookmark forget` now untracks any corresponding remote bookmarks instead
  of forgetting them, since forgetting a remote bookmark can be unintuitive.
  The old behavior is still available with the new `--include-remotes` flag.

* `jj fix` now always sets the working directory of invoked tools to be the
  workspace root, instead of the working directory of the `jj fix`.

* The `ui.allow-filesets` configuration option has been removed.
  [The "fileset" language](docs/filesets.md) has been enabled by \ 
default since v0.20.

* `templates.annotate_commit_summary` is renamed to `templates.file_annotate`,
  and now has an implicit `self` parameter of type `AnnotationLine`, instead of
  `Commit`. All methods on `Commit` can be accessed with `commit.method()`, or
  `self.commit().method()`.

### Deprecations

* This release takes the first steps to make target revision required in
  `bookmark create`, `bookmark move` and `bookmark set`. Those commands will display
  a warning if the user does not specify target revision  explicitly. In the near
  future those commands will fail if target revision is not specified.

* The `signing.sign-all` config option has been deprecated in favor of
  `signing.behavior`. The new option accepts `drop` (never sign), `keep` (preserve
  existing signatures), `own` (sign own commits), or `force` (sign all commits).
  Existing `signing.sign-all = true` translates to `signing.behavior = \ 
"own"`, and
  `false` translates to `"keep"`. Invalid configuration is now an error.

### New features

* The new `jj sign` and `jj unsign` commands allow for signing/unsigning commits.
  `jj sign` supports configuring the default revset through `revsets.sign` when
  no `--revisions` arguments are provided.

* `jj git fetch` now supports [string pattern \ 
syntax](docs/revsets.md#string-patterns)
  on `--remote` option and `git.fetch` configuration.

* Template functions `truncate_start()` and `truncate_end()` gained an optional
  `ellipsis` parameter; passing this prepends or appends the ellipsis to the
  content if it is truncated to fit the maximum width.

* Templates now support `stringify(x)` function and string method
  `.escape_json()`. The latter serializes the string in JSON format. It is
  useful for making machine-readable templates by escaping problematic
  characters like `\n`.

* Templates now support `trim()`, `trim_start()` and `trim_end()` methods
  which remove whitespace from the start and end of a `String` type.

* The description of commits backed out by `jj backout` can now be configured
  using `templates.backout_description`.

* New `AnnotationLine` templater type. Used in `templates.file_annotate`.
  Provides `self.commit()`, `.content()`, `.line_number()`, and
  `.first_line_in_hunk()`.

* Templates now have `format_short_operation_id(id)` function for users to
  customize the default operation id representation.

* The `jj init`/`jj revert` stubs that print errors can now be overridden with
  aliases. All of `jj clone/init/revert` add a hint to a generic error.

* Help text is now colored (when stdout is a terminal).

* Commands that used to suggest `--ignore-immutable` now print the number of
  immutable commits that would be rewritten if used and a link to the docs.

* `jj undo` now shows a hint when undoing an undo operation that the user may
   be looking for `jj op restore` instead.

### Fixed bugs

* `jj status` now shows untracked files under untracked directories.
  [#5389](https://github.com/jj-vcs/jj/issues/5389)

* Added workaround for the bug that untracked files are ignored when watchman is
  enabled. [#5728](https://github.com/jj-vcs/jj/issues/5728)

* The `signing.backends.ssh.allowed-signers` configuration option will now
  expand `~/` to `$HOME/`.
  [#5626](https://github.com/jj-vcs/jj/pull/5626)

* `config-schema.json` now allows arrays of strings for the settings `ui.editor`
  and `ui.diff.tool`.

* `config-schema.json` now allows an array of strings or nested table for the
  `ui.pager` setting.

Log message:
jj: update to 0.26.0.

## [0.26.0] - 2025-02-05

### Release highlights

* Improved Git push/fetch compatibility by spawning an external `git` process.
  This can be enabled by the `git.subprocess=true` config knob, and will be the
  default in a future release.

* `jj log` can now show cryptographic commit signatures. The output can be
  controlled by the `ui.show-cryptographic-signatures=true` config knob.

### Breaking changes

* `jj abandon` now deletes bookmarks pointing to the revisions to be abandoned.
  Use `--retain-bookmarks` to move bookmarks backwards. If deleted bookmarks
  were tracking remote bookmarks, the associated bookmarks (or branches) will be
  deleted from the remote on `jj git push --all`.
  [#3505](https://github.com/jj-vcs/jj/issues/3505)

* `jj init --git` and `jj init --git-repo` have been removed. They were
  deprecated in early 2024. Use `jj git init` instead.

* The following deprecated commands have been removed:
  - `jj cat` is replaced by `jj file show`.
  - `jj chmod` is replaced by `jj file chmod`.
  - `jj files` is replaced by `jj file list`.

* The deprecated `-l` short alias for `--limit` in `jj log`, `jj op log`
  and `jj obslog` has been removed. The `-n` short alias can be used instead.

* The deprecated `--siblings` options for `jj split` has been removed.
  `jj split --parallel` can be used instead.

* The deprecated `fix.tool-command` config option has been removed.

* In colocated repos, the Git index now contains the changes from all parents
  of the working copy instead of just the first parent (`HEAD`). 2-sided
  conflicts from the merged parents are now added to the Git index as conflicts
  as well.

* The following change introduced in 0.25.0 is reverted:
  - `jj config list` now prints inline tables `{ key = value, .. }` literally.
    Inner items of inline tables are no longer merged across configuration
    files.

* `jj resolve` will now attempt to resolve all conflicted files instead of
  resolving the first conflicted file. To resolve a single file, pass a file
  path to `jj resolve`.

* `jj util mangen` is replaced with `jj util install-man-pages`, which can
  install man pages for all `jj` subcommands to a given path.

* In `jj config list` template, `value` is now typed as `ConfigValue`, not as
  `String` serialized in TOML syntax.

* `jj git remote add`/`set-url` now converts relative Git remote path to
  absolute path.

* `jj log`/`op log` now applies `-n`/`--limit` *before* the items are reversed.
  Rationale: It's more useful to see the N most recent commits/operations, and
  is more performant. The old behavior can be achieved by `jj log .. | head`.
  [#5403](https://github.com/jj-vcs/jj/issues/5403)

* Upgraded `scm-record` from v0.4.0 to v0.5.0. See release notes at
  <https://github.com/arxanas/scm-record/releases/tag/v0.5.0>.

* The builtin pager is switched to
  [streampager](https://github.com/markbt/streampager/). It can handle large
  inputs better and can be configured.

* Conflicts materialized in the working copy before `jj 0.19.0` may no longer
  be parsed correctly. If you are using version 0.18.0 or earlier, check out a
  non-conflicted commit before upgrading to prevent issues.

### Deprecations

### New features

* `jj git {push,clone,fetch}` can now spawn an external `git` subprocess, via
   the `git.subprocess = true` config knob. This provides an alternative that,
   when turned on, fixes SSH bugs when interacting with Git remotes due to
   `libgit2`s limitations [#4979](https://github.com/jj-vcs/jj/issues/4979).

* `jj describe` now accepts `--edit`.

* `jj evolog` and `jj op log` now accept `--reversed`.

* `jj restore` now supports `-i`/`--interactive` selection.

* `jj file list` now supports templating.

* There is a new `builtin_op_log_oneline` template alias you can pass to `jj op
  log -T` for a more compact output. You can use `format_operation_oneline` and
  `format_snapshot_operation_oneline` to customize parts of it.

* New template function `config(name)` to access to configuration variable from
  template.

* New template function `pad_centered()` to center content within a minimum
  width.

* Templater now supports `list.filter(|x| ..)` method.

* The `diff` commit template keyword now supports custom formatting via
  `diff.files()`. For example, `diff.files().map(|e| e.path().display())` prints
  changed file paths.

* The `diff.stat()` template method now provides methods to get summary values.

* `jj log` can now show cryptographic commit signatures. The output can be
  controlled by the `ui.show-cryptographic-signatures=true` config knob. The
  signature template can be customized using
  `format_detailed_cryptographic_signature(signature)` and
  `format_short_cryptographic_signature(signature)`.

* New `git.sign-on-push` config option to automatically sign commits which are
  being pushed to a Git remote.

* New `git.push-new-bookmarks` config option to push new bookmarks without
  `--allow-new`.

* `jj status` now shows untracked files when they reside directly under a
  tracked directory. There's still an issue that files under untracked
  directories aren't listed. [#5389](https://github.com/jj-vcs/jj/issues/5389)

* New `merge-tools.<TOOL>.diff-expected-exit-codes` config option to suppress
  warnings from tools exiting with non-zero exit codes.

* New `fix.tools.TOOL.enabled` config option to enable/disable tools. This is
  useful for defining disabled tools in user configuration that can be enabled
  in individual repositories with one config setting.

* Added `--into` flag to `jj restore`, similarly to `jj squash` and `jj
  absorb`. It is equivalent to `--to`, but `--into` is the recommended name.

* Italic text is now supported. You can set e.g. `color.error = { fg = \ 
"red",
  italic = true }` in your config.

* New `author_name`/`author_email`/`committer_name`/`committer_email(pattern)`
  revset functions to match either name or email field explicitly.

* New `subject(pattern)` revset function that matches first line of commit
  descriptions.

* Conditional configuration now supports `--when.commands` to change
  configuration based on subcommand.

* The Jujutsu documentation site now publishes a schema for the official
  configuration file, which can be integrated into your editor for autocomplete,
  inline errors, and more.
  Please [see the documentation](/docs/config.md#json-schema-support) for more
  on this.

### Fixed bugs

* `jj git fetch` with multiple remotes will now fetch from all remotes before
  importing refs into the jj repo. This fixes a race condition where the
  treatment of a commit that is found in multiple fetch remotes depended on the
  order the remotes were specified.

* Fixed diff selection by external tools with `jj split`/`commit -i FILESETS`.
  [#5252](https://github.com/jj-vcs/jj/issues/5252)

* Conditional configuration now applies when initializing new repository.
  [#5144](https://github.com/jj-vcs/jj/issues/5144)

* `[diff.<format>]` configuration now applies to \ 
`.diff().<format>()` commit
  template methods.

* Conflicts at the end of files which don't end with a newline character are
  now materialized in a way that can be parsed correctly.
  [#3968](https://github.com/jj-vcs/jj/issues/3968)

* Bookmark and remote names written by `jj git clone` to
  `revset-aliases.'trunk()'` are now escaped if necessary.
  [#5359](https://github.com/jj-vcs/jj/issues/5359)

Log message:
jj: update to 0.25.0.

## [0.25.0] - 2025-01-01

### Release highlights

It's the holidays, and this release was overall pretty quiet, without many major
changes. Two select improvements:

* Improvements to configuration management, including support for [conditional
  variables](docs/config.md#conditional-variables) in config files.

* Large files in the working copy will no longer cause commands to fail; instead
  the large files will remain intact but untracked in the working copy.

### Breaking changes

* Configuration variables are no longer "stringly" typed. For example, \ 
`true` is
  not converted to a string `"true"`, and vice versa.

* The following configuration variables are now parsed strictly:
  `colors.<labels>`, `git.abandon-unreachable-commits`,
  `git.auto-local-bookmark`, `git.push-bookmark-prefix`, `revsets.log`,
  `revsets.short-prefixes` `signing.backend`, `operation.hostname`,
  `operation.username`, `ui.allow-init-native`, `ui.color`,
  `ui.default-description`, `ui.progress-indicator`, `ui.quiet`, `user.email`,
  `user.name`

* `jj config list` now prints inline tables `{ key = value, .. }` literally.
  Inner items of inline tables are no longer merged across configuration files.
  See [the table syntax
  documentation](docs/config.md#dotted-style-headings-and-inline-tables) for
  details.

* `jj config edit --user` now opens a file even if `$JJ_CONFIG` points to a
  directory. If there are multiple config files, the command will fail.

* `jj config set` no longer accepts a bare string value that looks like a TOML
  expression. For example, `jj config set NAME '[foo]'` must be quoted as `jj
  config set NAME '"[foo]"'`.

* The deprecated `[alias]` config section is no longer respected. Move command
  aliases to the `[aliases]` section.

* `jj absorb` now abandons the source commit if it becomes empty and has no
  description.

### Deprecations

* `--config-toml=TOML` is deprecated in favor of `--config=NAME=VALUE` and
  `--config-file=PATH`.

* The `Signature.username()` template method is deprecated for
  `Signature().email().local()`.

### New features

* `jj` command no longer fails due to new working-copy files larger than the
  `snapshot.max-new-file-size` config option. It will print a warning and large
  files will be left untracked.

* Configuration files now support [conditional
  variables](docs/config.md#conditional-variables).

* New command options `--config=NAME=VALUE` and `--config-file=PATH` to set
  string value without quoting and to load additional configuration from files.

* Templates now support the `>=`, `>`, `<=`, and `<` relational \ 
operators for
  `Integer` types.

* A new Email template type is added. `Signature.email()` now returns an Email
  template type instead of a String.

* Adds a new template alias `commit_timestamp(commit)` which defaults to the
  committer date.

* Conflict markers are now allowed to be longer than 7 characters, allowing
  conflicts to be materialized and parsed correctly in files which already
  contain lines that look like conflict markers.

* New `$marker_length` variable to allow merge tools to support longer conflict
  markers (equivalent to "%L" for Git merge drivers).

* `jj describe` now accepts a `JJ: ignore-rest` line that ignores everything
  below it, similar to a "scissor line" in git. When editing multiple \ 
commits,
  only ignore until the next `JJ: describe` line.

### Fixed bugs

* The `$NO_COLOR` environment variable must now be non-empty to be respected.

* Fixed incompatible rendering of empty hunks in git/unified diffs.
  [#5049](https://github.com/jj-vcs/jj/issues/5049)

* Fixed performance of progress bar rendering when fetching from Git remote.
  [#5057](https://github.com/jj-vcs/jj/issues/5057)

* `jj config path --user` no longer creates new file at the default config path.

* On Windows, workspace paths (printed by `jj root`) no longer use UNC-style
  `\\?\` paths unless necessary.

* On Windows, `jj git clone` now converts local Git remote path to
  slash-separated path.

* `jj resolve` no longer removes the executable bit on resolved files when using
  an external merge tool.

Log message:
jj: update to 0.24.0.

## [0.24.0] - 2024-12-04

### Breaking changes

* `jj move` has been removed. It was deprecated in 0.16.0.

* `jj checkout` and the built-in alias `jj co` have been removed.
  It was deprecated in 0.14.0.

* `jj merge` has been removed. It was deprecated in 0.14.0.

* `jj git push` no longer pushes new bookmarks by default. Use `--allow-new` to
  bypass this restriction.

* Lines prefixed with "JJ:" in commit descriptions and in sparse \ 
patterns (from
  `jj sparse edit`) are now stripped even if they are not immediately followed
  by a space. [#5004](https://github.com/martinvonz/jj/issues/5004)

### Deprecations

### New features

* Templates now support the `==` and `!=` logical operators for `Boolean`,
  `Integer`, and `String` types.

* New command `jj absorb` that moves changes to stack of mutable revisions.

* New command `jj util exec` that can be used for arbitrary aliases.

* `jj rebase -b` can now be used with the `--insert-after` and `--insert-before`
  options, like `jj rebase -r` and `jj rebase -s`.

* A preview of improved shell completions was added. Please refer to the
  \ 
[documentation](https://martinvonz.github.io/jj/latest/install-and-setup/#command-line-completion)
  to activate them. They additionally complete context-dependent, dynamic values
  like bookmarks, aliases, revisions, operations and files.

* Added the config setting `snapshot.auto-update-stale` for automatically
  running `jj workspace update-stale` when applicable.

* `jj duplicate` now accepts `--destination`, `--insert-after` and
  `--insert-before` options to customize the location of the duplicated
  revisions.

* `jj log` now displays the working-copy branch first.

* New `fork_point()` revset function can be used to obtain the fork point
  of multiple commits.

* The `tags()` revset function now takes an optional `pattern` argument,
  mirroring that of `bookmarks()`.

* Several commands now support `-f/-t` shorthands for `--from/--to`:
  - `diff`
  - `diffedit`
  - `interdiff`
  - `op diff`
  - `restore`

* New `ui.conflict-marker-style` config option to change how conflicts are
  materialized in the working copy. The default option ("diff") renders
  conflicts as a snapshot with a list of diffs to apply to the snapshot.
  The new "snapshot" option renders conflicts as a series of \ 
snapshots, showing
  each side and base of the conflict. The new "git" option replicates Git's
  "diff3" conflict style, meaning it is more likely to work with \ 
external tools,
  but it doesn't support conflicts with more than 2 sides.

* New `merge-tools.<TOOL>.conflict-marker-style` config option to override the
  conflict marker style used for a specific merge tool.

* New `merge-tools.<TOOL>.merge-conflict-exit-codes` config option to allow a
  merge tool to exit with a non-zero code to indicate that not all conflicts
  were resolved.

* `jj simplify-parents` now supports configuring the default revset when no
   `--source` or `--revisions` arguments are provided with the
   `revsets.simplify-parents` config.

### Fixed bugs

* `jj config unset <TABLE-NAME>` no longer removes a table (such as `[ui]`.)

Log message:
jj: update to 0.23.0.

## [0.23.0] - 2024-11-06

### Security fixes

* Fixed path traversal by cloning/checking out crafted Git repository containing
  `..`, `.jj`, `.git` paths.
  \ 
([GHSA-88h5-6w7m-5w56](https://github.com/martinvonz/jj/security/advisories/GHSA-88h5-6w7m-5w56);CVE-2024-51990)

### Breaking changes

* Revset function names can no longer start with a number.

* Evaluation error of `revsets.short-prefixes` configuration is now reported.

* The `HEAD@git` symbol no longer resolves to the Git HEAD revision. Use
  `git_head()` or `@-` revset expression instead. The `git_head` template
  keyword now returns a boolean.

* Help command doesn't work recursively anymore, i.e. `jj workspace help root`
  doesn't work anymore.

* The color label `op_log` from the `[colors]` config section now **only**
  applies to the op log and not to the other places operations are displayed. In
  almost all cases, if you configured `op_log` before, you should use the new
  `operation` label instead.

* Default operation log template now shows end times of operations instead of
  start times.

### Deprecations

* `git.auto-local-bookmark` replaces `git.auto-local-branch`. The latter remains
  supported for now (at lower precedence than the former).

### New features

* Added diff options to ignore whitespace when comparing lines. Whitespace
  changes are still highlighted.

* New command `jj simplify-parents` will remove redundant parent edges.

* `jj squash` now supports `-f/-t` shorthands for `--from/--[in]to`.

* Initial support for shallow Git repositories has been implemented. However,
  deepening the history of a shallow repository is not yet supported.

* `jj git clone` now accepts a `--depth <DEPTH>` option, which
  allows to clone the repository with a given depth.

* New command `jj file annotate` that annotates files line by line. This is similar
  in functionality to `git blame`. Invoke the command with `jj file annotate \ 
<file_path>`.
  The output can be customized via the `templates.annotate_commit_summary`
  config variable.

* `jj bookmark list` gained a `--remote REMOTE` option to display bookmarks
   belonging to a remote. This option can be combined with `--tracked` or
   `--conflicted`.

* New command `jj config unset` that unsets config values. For example,
  `jj config unset --user user.name`.

* `jj help` now has the flag `--keyword` (shorthand `-k`), which can give help
  for some keywords (e.g. `jj help -k revsets`). To see a list of the available
  keywords you can do `jj help --help`.

* New `at_operation(op, expr)` revset can be used in order to query revisions
  based on historical state.

* String literals in filesets, revsets and templates now support hex bytes
  (with `\e` as escape / shorthand for `\x1b`).

* New `coalesce(revsets...)` revset which returns commits in the first revset
  in the `revsets` list that does not evaluate to `none()`.

* New template function `raw_escape_sequence(...)` preserves escape sequences.

* Timestamp objects in templates now have `after(date) -> Boolean` and
  `before(date) -> Boolean` methods for comparing timestamps to other dates.

* New template functions `pad_start()`, `pad_end()`, `truncate_start()`, and
  `truncate_end()` are added.

* Add a new template alias `bultin_log_compact_full_description()`.

* Added the config settings `diff.color-words.context` and `diff.git.context` to
  control the default number of lines of context shown.

### Fixed bugs

* Error on `trunk()` revset resolution is now handled gracefully.
  [#4616](https://github.com/martinvonz/jj/issues/4616)

* Updated the built-in diff editor `scm-record` to version
  [0.4.0](https://github.com/arxanas/scm-record/releases/tag/v0.4.0), which
  includes multiple fixes.

Log message:
jj: update to 0.22.0.

## [0.22.0] - 2024-10-02

### Breaking changes

* Fixing [#4239](https://github.com/martinvonz/jj/issues/4239) means the
  ordering of some messages have changed.

* Invalid `ui.graph.style` configuration is now an error.

* The builtin template `branch_list` has been renamed to `bookmark_list` as part
  of the `jj branch` deprecation.

### Deprecations

* `jj branch` has been deprecated in favor of `jj bookmark`.

  **Rationale:** Jujutsu's branches don't behave like Git branches, which a
  confused many newcomers, as they expected a similar behavior given the name.
  We've renamed them to "bookmarks" to match the actual behavior, as \ 
we think
  that describes them better, and they also behave similar to Mercurial's
  bookmarks.

* `jj obslog` is now called `jj evolution-log`/`jj evolog`. `jj obslog` remains
  as an alias.

* `jj unsquash` has been deprecated in favor of `jj squash` and
  `jj diffedit --restore-descendants`.

  **Rationale:** `jj squash` can be used in interactive mode to pull
  changes from one commit to another, including from a parent commit
  to a child commit. For fine-grained dependent diffs, such as when
  the parent and the child commits must successively modify the same
  location in a file, `jj diffedit --restore-descendants` can be used
  to set the parent commit to the desired content without altering the
  content of the child commit.

* The `git.push-branch-prefix` config has been deprecated in favor of
  `git.push-bookmark-prefix`.

* `conflict()` and `file()` revsets have been renamed to `conflicts()` and `files()`
  respectively. The old names are still around and will be removed in a future
  release.

### New features

* The new config option `snapshot.auto-track` lets you automatically track only
  the specified paths (all paths by default). Use the new `jj file track`
  command to manually tracks path that were not automatically tracked. There is
  no way to list untracked files yet. Use `git status` in a colocated workspace
  as a workaround.
  [#323](https://github.com/martinvonz/jj/issues/323)

* `jj fix` now allows fixing unchanged files with the \ 
`--include-unchanged-files` flag. This
  can be used to more easily introduce automatic formatting changes in a new
  commit separate from other changes.

* `jj workspace add` now accepts a `--sparse-patterns=<MODE>` option, which
  allows control of the sparse patterns for a newly created workspace: `copy`
  (inherit from parent; default), `full` (full working copy), or `empty` (the
  empty working copy).

* New command `jj workspace rename` that can rename the current workspace.

* `jj op log` gained an option to include operation diffs.

* `jj git clone` now accepts a `--remote <REMOTE NAME>` option, which
  allows to set a name for the remote instead of using the default
  `origin`.

* `jj op undo` now reports information on the operation that has been undone.

* `jj squash`: the `-k` flag can be used as a shorthand for `--keep-emptied`.

* CommitId / ChangeId template types now support `.normal_hex()`.

* `jj commit` and `jj describe` now accept `--author` option allowing to quickly \ 
change
  author of given commit.

* `jj diffedit`, `jj abandon`, and `jj restore` now accept a `--restore-descendants`
  flag. When used, descendants of the edited or deleted commits will keep their \ 
original
  content.

* `jj git fetch -b <remote-git-branch-name>` will now warn if the branch(es)
   can not be found in any of the specified/configured remotes.

* `jj split` now lets the user select all changes in interactive mode. This may \ 
be used
  to keeping all changes into the first commit while keeping the current commit
  description for the second commit (the newly created empty one).

* Author and committer names are now yellow by default.

### Fixed bugs

* Update working copy before reporting changes. This prevents errors during reporting
  from leaving the working copy in a stale state.

* Fixed panic when parsing invalid conflict markers of a particular form.
  ([#2611](https://github.com/martinvonz/jj/pull/2611))

* Editing a hidden commit now makes it visible.

* The `present()` revset now suppresses missing working copy error. For example,
  `present(@)` evaluates to `none()` if the current workspace has no
  working-copy commit.

Log message:
jj: update to 0.21.0.

## [0.21.0] - 2024-09-04

### Breaking changes

* `next/prev` will no longer infer when to go into edit mode when moving from
  commit to commit. It now either follows the flags `--edit|--no-edit` or it
  gets the mode from `ui.movement.edit`.

### Deprecations

* `jj untrack` has been renamed to `jj file untrack`.

### New features

* Add new boolean config knob, `ui.movement.edit` for controlling the behaviour
  of `prev/next`. The flag turns `edit` mode `on` and `off` permanently when set
  respectively to `true` or `false`.

* All diff formats except `--name-only` now include information about copies and
  moves. So do external diff tools in file-by-file mode. `jj status` also
  includes information about copies and moves.

* Color-words diff has gained [an option to display complex changes as separate
  lines](docs/config.md#color-words-diff-options). It's enabled by default. To
  restore the old behavior, set `diff.color-words.max-inline-alternation = -1`.

* A tilde (`~`) at the start of the path will now be expanded to the user's home
  directory when configuring a `signing.key` for SSH commit signing.

* When reconfiguring the author, warn that the working copy won't be updated

Log message:
jj: update to 0.19.0.

## [0.19.0] - 2024-07-03

### Breaking changes

* In revset aliases, top-level `kind:pattern` expression is now parsed as
  modifier. Surround with parentheses if it should be parsed as string/file
  pattern.

* Dropped support for automatic upgrade of repo formats used by versions before
  0.12.0.

* `jj fix` now defaults to the broader revset `-s reachable(@, mutable())`
  instead of `-s @`.

* Dropped support for deprecated `jj branch delete`/`forget` `--glob` option.

* `jj branch set` now creates new branch if it doesn't exist. Use `jj branch
  move` to ensure that the target branch already exists.
  [#3584](https://github.com/martinvonz/jj/issues/3584)

### Deprecations

* Replacing `-l` shorthand for `--limit` with `-n` in `jj log`, `jj op log`
  and `jj obslog`.

* `jj split --siblings` is deprecated in favor of `jj split --parallel` (to
  match `jj parallelize`).

* A new `jj file` subcommand now replaces several existing uncategorized
  commands, which are deprecated.
  - `jj file show` replaces `jj cat`.
  - `jj file chmod` replaces `jj chmod`.
  - `jj file list` replaces `jj files`.

### New features

* Support background filesystem monitoring via watchman triggers enabled with
  the `core.watchman.register_snapshot_trigger = true` config.

* Show paths to config files when configuration errors occur.

* `jj fix` now supports configuring the default revset for `-s` using the
  `revsets.fix` config.

* The `descendants()` revset function now accepts an optional `depth` argument;
  like the `ancestors()` depth argument, it limits the depth of the set.

* Revset/template aliases now support function overloading.
  [#2966](https://github.com/martinvonz/jj/issues/2966)

* Conflicted files are individually simplified before being materialized.

* The `jj file` subcommand now contains several existing file utilities.
  - `jj file show`, replacing `jj cat`.
  - `jj file chmod` replacing `jj chmod`.
  - `jj file list` replacing `jj files`.

* New command `jj branch move` let you update branches by name pattern or source
  revision.

* New diff option `jj diff --name-only` allows for easier shell scripting.

* In color-words diffs, hunks are now highlighted with underline. See [diff
  colors and styles](docs/config.md#diff-colors-and-styles) for customization.

* `jj git push -c <arg>` can now accept revsets that resolve to multiple
  revisions. This means that `jj git push -c xyz -c abc` is now equivalent to
  `jj git push -c 'all:(xyz | abc)'`.

* `jj prev` and `jj next` have gained a `--conflict` flag which moves you
  to the next conflict in a child commit.

* New command `jj git remote set-url` that sets the url of a git remote.

* Author timestamp is now reset when rewriting discardable commits (empty
  commits with no description) if authored by the current user.
  [#2000](https://github.com/martinvonz/jj/issues/2000)

* `jj commit` now accepts `--reset-author` option to match `jj describe`.

* `jj squash` now accepts a `--keep-emptied` option to keep the source commit.

### Fixed bugs

* `jj git push` now ignores immutable commits when checking whether a
  to-be-pushed commit has conflicts, or has no description / committer / author
  set. [#3029](https://github.com/martinvonz/jj/issues/3029)

* `jj` will look for divergent changes outside the short prefix set even if it
  finds the change id inside the short prefix set.
  [#2476](https://github.com/martinvonz/jj/issues/2476)