Add mechanism for escaping shorthand substitution

* src/lread.c (read1): Add skip_shorthand variable.  Add a '#\'
case.  Sometimes call oblookup instead of
oblookup_considering_shorthand.

Consider shorthands in Elisp's elisp-completion-at-point

* lisp/progmodes/elisp-mode.el : new helper.
(elisp-completion-at-point): Use new helpers.
(elisp--completion-local-symbols)
(elisp--fboundp-considering-shorthands)
(elisp--bboundp-considering-shorthands): New helpers

* src/lread.c (intern_driver): Nullify Qobarray_cache.
(syms_of_lread): Add Qobarray_cache.

* test/lisp/progmodes/elisp-resources/magnars-string-user.el: New
file to play around with `magnars-string` library.

* lisp/emacs-lisp/magnars-string.el: New file.

Adjust C style and add comments to shorthand code

* src/lread.c (oblookup_considering_shorthand): Adjust
declaration.
(read1, Fintern_soft): Adjust C style.
(oblookup_considering_shorthand): Adjust C style.  Add comments.

Rework docstring of hack-elisp-shorthands

* lisp/international/mule.el (hack-elisp-shorthands): Rework
docstring.

Rework elisp-shorthands to only allow only prefix substitution

This simplification in requirements makes for more complex C code but
that code is much less wasteful in Lisp strings than the previous
implementation.

* src/lread.c (read1): Rework.
(Fintern): Rework.
(Fintern_soft): Rework.
(Funintern): Rework.
(oblookup_considering_shorthand): Rewrite.

* test/lisp/progmodes/elisp-mode-tests.el (elisp-shorthand-read-buffer)
(elisp-shorthand-read-from-string): Use new format of
shorthand-longhand-.

* test/lisp/progmodes/elisp-resources/simple-shorthand-test.el (f-test)
(f-test2, f-test3): Use new form of elisp-shorthands.

Add a test for byte-compilation

* test/lisp/progmodes/elisp-mode-tests.el
(elisp-shorthand-byte-compile-a-file): New test.
(elisp-shorthand-load-a-file): Simplify.

Integrate shorthand functionality into elisp-mode.el

Also rename the main variable to elisp-shorthands, from the
silly pleonastic shorthand-shorthands.

For some reason, I had to stick the new source-file loading functions
in lisp/international/mule.el, otherwise lisp/loadup.el wouldn't see
them.  This should probably be fixed.

* lisp/shorthand.el: Remove.

* lisp/progmodes/elisp-mode.el (elisp--shorthand-load-wrapper):
Move here.

* src/lread.c (oblookup_considering_shorthand, syms_of_lread):
Rename variable elisp-shorthand, from shorthand-shorthands.

* test/lisp/shorthand-tests.el: Remove.

* test/lisp/progmodes/elisp-mode-tests.el (elisp-shorthand-read-buffer)
(elisp-shorthand-read-from-string)
(elisp-shorthand-load-a-file): New tests.

* test/lisp/progmodes/elisp-resources/simple-shorthand-test.el: New file

* lisp/loadup.el (load-source-file-function): Set to
  load-with-shorthands-and-code-conversion.

* lisp/international/mule.el (hack-elisp-shorthands): Move here.
(load-with-shorthands-and-code-conversion): And here.

Robustify checking of shorthand-shorthands

* src/lread.c (oblookup_considering_shorthand): Maybe warn when we
find fishy shorthand-shorthands.

Move most of the shorthand implementation to C code

This very likely isn't the final form of the implementation.  For one,
the reader is much slower and allocates a Lisp string for every atom
read, regardless if its already interned or not, which perhaps has the
potential to be catastrophic in terms of GC.

But it passes the tests.

The solution to this, is probably to simplify the semantics of
shorthand-shorthands.  Instead of making it a regexp-to-longhand
alist, make it just prefix-to-longhand.  Then we wouldn't need to call
Fstring_match in oblookup_considering_shorthand, meaning we wouldn't
need a Lisp string there.

* lisp/shorthand.el (shorthand-shorthands): Move to C code.
(shorthand--expand-shorthand): Remove.
(shorthand-read-wrapper): Remove.
(shorthand-intern-soft-wrapper): Remove.
(read, intern-soft): No longer advise.

* src/lread.c:
(read1, Fintern, Fintern_soft, Funintern): Use
oblookup_considering_shorthand.
(oblookup_considering_shorthand): New helper.
(syms_of_lread): Declare shorthand-shorthands.

First Elisp version of lisp/shorthand.el, failing some tests

* lisp/shorthand.el: New file

* test/lisp/shorthand-tests.el: New file

Update comments warning about GC-resistant C programming

* src/eval.c: Remove an outdated comment about protection from GC.
* src/buffer.h:
* src/lisp.h: Add warnings about using 'char *' pointers to text
of Lisp strings and buffer text in code that could GC.  Reported by
Po Lu <luangruo@yahoo.com>

Native compilation on macOS: libgccjit not found

* etc/PROBLEMS: Describe the problem with libgccjit setup on
macOS.  (Bug#50411)

; * doc/misc/mh-e.texi (Scan Line Formats): Fix typo, an extra "the".

Speed up `replace-match' slightly

* src/search.c (Freplace_match): Speed up non-literal (but
actually literal) common case.

This makes

(benchmark-run 1000000
  (replace-regexp-in-string
  "a+" "foo"
  "ogihdipofdhookfdohkfdpokhpokhfdpokfdhpokfdhkdfkhgoadfphokfkhpofdkhkdpokf"))

about 10% faster.

Migrate MH-E functional tests from SourceForge

* test/lisp/mh-e/mh-limit-tests.el:
* test/lisp/mh-e/mh-utils-tests.el:
* test/lisp/mh-e/mh-xface-tests.el:
Import the functional tests from src/mh-unit.el.

mh-unit.el is from the old SourceForge mh-e repository, last changed
in 2017.  To this are applied unmerged patches Mike Kupfer wrote in
2018 ("Refactor mh-unit into functional and release tests" and
"Fix the functional tests").

All tests have been converted to run under Emacs's ERT framework.

Some tests for mh-utils use MH programs to examine mail folders.
These tests require an MH variant to be installed on the system; for
these, added both a mock harness that pretends the needed files and MH
programs do exist, and a wrapper that creates the necessary mail files.

New function 'mh-test-utils-setup-with-variant' bears some resemblance
to 'mh-test-folders-set-up' from the original tests.  New function
'mh-test-utils-setup-with-mocks' is new functionality for these tests.

Change how thread-first/thread-last indent the first argument

* lisp/doc-view.el (doc-view--current-cache-dir): Reindent.

* lisp/emacs-lisp/subr-x.el (thread-first):
(thread-last): Change indentation to match examples.
(internal--build-binding): Reindent.

* test/lisp/emacs-lisp/subr-x-tests.el
(subr-x-test-thread-first-function-names-are-threaded):
(subr-x-test-thread-first-examples):
(subr-x-test-thread-last-function-names-are-threaded):
(subr-x-test-thread-last-examples): Reindent.

Make global-auto-revert-non-file-buffers work better

* lisp/autorevert.el (global-auto-revert-mode): Always switch on
the non-file tracking.
(auto-revert--global-possibly-adopt-current-buffer): New function
to respect dynamically changing `global-auto-revert-non-file-buffers'.

(etc-authors-mode--hide-local-variables): Obfuscate more efficiently

; * etc/NEWS: Improve wording of an item.

* lisp/emacs-lisp/hierarchy.el: Improve wording of package description.

Fix warning in etc-authors-mode.el

* lisp/textmodes/etc-authors-mode.el
(etc-authors-mode--hide-local-variables): Avoid warning.

Don't quote nil and t in doc strings and comments

* test/src/minibuf-tests.el (test-try-completion-ignore-case):
* test/lisp/url/url-auth-tests.el
(url-auth-test-digest-auth-retrieve-cache):
* test/lisp/subr-tests.el (subr-tests-add-hook-depth):
* test/lisp/so-long-tests/so-long-tests.el
(so-long-tests-invisible-buffer-function):
* test/lisp/emacs-lisp/tabulated-list-test.el (tabulated-list-sort):
* src/xfaces.c:
* src/process.c (Finterrupt_process):
(syms_of_process):
* src/minibuf.c (Fread_from_minibuffer):
(Fcompleting_read):
(syms_of_minibuf):
* src/dispnew.c (syms_of_display):
* src/data.c:
* lisp/so-long.el (so-long--hack-local-variables):
* lisp/progmodes/elisp-mode.el (elisp--xref-find-definitions):
(elisp--xref-find-definitions):
* lisp/org/ox-html.el (org-html-htmlize-output-type):
* lisp/org/org-agenda.el (org-agenda-do-in-region):
* lisp/net/tramp.el:
* lisp/minibuffer.el (set-minibuffer-message):
* lisp/isearch.el (isearch-wrap-pause):
(isearch-repeat-on-direction-change):
* lisp/emacs-lisp/timer.el (timer):
* lisp/emacs-lisp/package.el (package-read-archive-contents):
* lisp/emacs-lisp/faceup.el (faceup-next-property-change):
* lisp/emacs-lisp/comp.el (comp-func):
* lisp/emacs-lisp/comp-cstr.el (comp-cstr-empty-p):
* lisp/emacs-lisp/cl-macs.el (cl-do):
(cl-do*):
(cl--self-tco):
* lisp/emacs-lisp/bytecomp.el (byte-compile-unresolved-functions):
(byte-compile-cond-jump-table): Don't quote t and nil.

Document isearch-wrap-pause

* doc/emacs/search.texi (Repeat Isearch): Document
`isearch-wrap-pause'.

New major mode with font-locking for etc/AUTHORS

* lisp/textmodes/etc-authors-mode.el: New file.  (Bug#50674)
* etc/AUTHORS (mode): Add "mode: etc-authors" to local variables.
* admin/authors.el (authors): Add "mode: etc-authors" to local
variables of the generated AUTHORS file.

; * doc/lispref/windows.texi (Cyclic Window Ordering): Fix typo.

Improve recently added documentation

* doc/lispref/lists.texi (Building Lists):
* lisp/subr.el (ensure-list): Avoid passive tense in documenting
'ensure-list'.

Add new function `ensure-list'

* doc/lispref/lists.texi (Building Lists): Document it.

* lisp/subr.el (ensure-list): New function.

* lisp/emacs-lisp/shortdoc.el (list): Mention it.

Merge branch 'master' of git.sv.gnu.org:/srv/git/emacs

Fix tramp-compat-temporary-file-directory implementation

* lisp/net/tramp-archive.el
(tramp-archive-handle-temporary-file-directory):
Use `tramp-compat-temporary-file-directory-function'.

* lisp/net/tramp-compat.el (tramp-compat-temporary-file-directory):
Make it a defconst.

* lisp/net/tramp.el (tramp-get-debug-buffer, tramp-get-debug-file-name)
(tramp-debug-message, tramp-file-name-handler, tramp-parse-file)
(tramp-parse-shostkeys-sknownhosts)
(tramp-handle-expand-file-name, tramp-handle-make-process)
(tramp-local-host-p, tramp-call-process)
(tramp-call-process-region, tramp-process-lines)
(tramp-read-passwd):
* lisp/net/tramp-adb.el (tramp-adb-maybe-open-connection):
* lisp/net/tramp-compat.el (tramp-compat-make-temp-name)
(tramp-compat-make-temp-file);
* lisp/net/tramp-crypt.el (tramp-crypt-file-name-for-operation)
(tramp-crypt-maybe-open-connection, tramp-crypt-send-command)
(tramp-crypt-do-encrypt-or-decrypt-file-name):
* lisp/net/tramp-fuse.el (tramp-fuse-mount-point, tramp-fuse-mounted-p)
(tramp-fuse-unmount):
* lisp/net/tramp-sh.el (tramp-do-copy-or-rename-file-out-of-band)
(tramp-sh-handle-expand-file-name)
(tramp-sh-handle-file-local-copy, )
(tramp-sh-handle-write-region, tramp-maybe-open-connection):
* lisp/net/tramp-smb.el (tramp-smb-maybe-open-connection): Use it.

; * lisp/emacs-lisp/checkdoc.el: Fix warnings.

Minor clean-up and fixes in checkdoc

* lisp/emacs-lisp/checkdoc.el: Minor doc fixes.  Remove unnecessary
space at the end of 'y-or-n-p' prompts.  Move obsolete definitions to
the end of the file.
(checkdoc-symbol-words, checkdoc-common-verbs-wrong-voice): Add
some more common words.

checkdoc: New defvars to disable some warnings

* lisp/emacs-lisp/checkdoc.el (checkdoc--argument-missing-flag)
(checkdoc--disambiguate-symbol-flag)
(checkdoc--interactive-docstring-flag): New defvars to disable some
warnings.  These are intended for use with Emacs itself rather than
with third-party libraries.
(checkdoc-this-string-valid, checkdoc-this-string-valid-engine):
Respect above new variables.

Add new command 'checkdoc-dired'

* lisp/emacs-lisp/checkdoc.el (checkdoc-dired): New command.
(checkdoc--dired-skip-lines-re): New constant.

More NEWS tagging

Do some NEWS tagging

Document `window-bump-use-time'

* doc/lispref/windows.texi (Cyclic Window Ordering): Mention
window-bump-use-time.

* lisp/tab-bar.el: Preserve all existing tab parameters when switching tabs.

* lisp/tab-bar.el (tab-bar--tab, tab-bar--current-tab-make):
Copy other possible tab parameters.
https://lists.gnu.org/archive/html/emacs-devel/2021-09/msg01544.html

Document completions-detailed

* doc/emacs/help.texi (Name Help): Document completions-detailed.
* lisp/minibuffer.el (completions-detailed): Give an example in
the doc string.

; * etc/NEWS: Refile recent addition (bug#50690).

Make dired-do-compress-to work in inserted subdirectories

* lisp/dired-aux.el (dired-do-compress-to): Make this work in file
in inserted subdirectories (bug#46913).

Revert "Make dired-compress-file query for a directory to uncompress to"

This reverts commit 7e395a59b025c7f4be49294ad806addf5b1a25c9.

The behaviour change isn't good for the majority of tar files.

Revert "Make recent dired tests check for external executables"

This reverts commit 98a17f30b8314e40a1edefac3d542d3e105c7bd6.

Reverting parent commit.

Restore some of the previous behaviour in whitespace-display-window

* lisp/whitespace.el (whitespace-display-window): Emulate previous
behaviour (bug#50716).  Code from martin rudalics <rudalics@gmx.at>.

; Stylistic docfixes in htmlfontify.el found by checkdoc

Don't use `format' on strings without % format directives

* lisp/vc/ediff-init.el (ediff-BAD-INFO):
* lisp/url/url-ldap.el (url-ldap):
* lisp/url/url-http.el (url-http--user-agent-default-string):
* lisp/textmodes/reftex.el (reftex-access-parse-file):
* lisp/textmodes/reftex-index.el (reftex-index-phrases-info):
* lisp/textmodes/ispell.el (ispell-create-debug-buffer):
* lisp/term.el (serial-read-speed):
* lisp/progmodes/verilog-mode.el (verilog-scan-debug):
* lisp/progmodes/idlwave.el (idlwave-find-module):
* lisp/progmodes/compile.el (compilation-revert-buffer):
* lisp/org/org-agenda.el (org-search-view):
* lisp/net/telnet.el (telnet-revert-buffer):
* lisp/net/soap-inspect.el (soap-sample-value-for-xs-simple-type):
* lisp/net/newst-backend.el (newsticker--cache-read):
* lisp/mh-e/mh-seq.el (mh-msg-is-in-seq):
* lisp/mail/smtpmail.el (smtpmail-via-smtp):
* lisp/mail/emacsbug.el (report-emacs-bug):
* lisp/jsonrpc.el (jsonrpc-error):
* lisp/help-fns.el (describe-variable):
* lisp/gnus/mm-decode.el (mm-possibly-verify-or-decrypt):
* lisp/gnus/gnus.el (gnus-group-startup-message):
(gnus-group-startup-message):
* lisp/gnus/gnus-group.el (gnus-group-restart):
* lisp/frame.el (make-frame-on-display):
* lisp/emulation/viper-ex.el (ex-help):
* lisp/calendar/icalendar.el (icalendar--convert-ical-to-diary):
(icalendar--add-diary-entry):
* lisp/calendar/cal-tex.el (cal-tex-end-document):
* lisp/calc/calcalg3.el (math-ninteg-romberg): Don't use `format'
on strings that have no % format directives in them.

Fix usage of `format' in mm-uu-pgp-encrypted-extract

* lisp/gnus/mm-uu.el (mm-uu-pgp-encrypted-extract): Use
`substring' instead of `format' to ensure a fresh string.

Fix usage of `format' in `article-verify-x-pgp-sig'

* lisp/gnus/gnus-art.el (article-verify-x-pgp-sig): Use
`substring' instead of `format' to ensure a fresh string.

Fix PGP verification buttons (which would have cached results)

* lisp/gnus/mm-uu.el (mm-uu-pgp-signed-extract): `format' was used
here to guarantee a new, fresh string (since it's destructively
modified), but that's apparently not the case any more.  Use
`substring' instead, which is documented to do this.

Don't inhibit redisplay in the mml* functions

* lisp/gnus/mml-smime.el (inhibit-redisplay): Removed.
(mml-smime-epg-encrypt):
(mml-smime-epg-verify): Don't inhibit.

* lisp/gnus/mml1991.el (mml1991-epg-sign): Ditto.

* lisp/gnus/mml2015.el (inhibit-redisplay): Removed
(mml2015-epg-decrypt):
(mml2015-epg-clear-decrypt):
(mml2015-epg-verify):
(mml2015-epg-clear-verify):
(mml2015-epg-sign):
(mml2015-epg-encrypt): Don't bind `inhibit-redisplay', because it
makes debugging very odd, and doesn't seem to help much with anything.

* python.el (python-syntax-stringify): Extend comment about last change

Fix emoji-zwj.awk dolist

* admin/unidata/emoji-zwj.awk: Fix typo, the dolist should end
after the first set-char-table-range.

Make recent dired tests check for external executables

* test/lisp/dired-aux-tests.el (dired-test-bug47058-tar)
(dired-test-bug47058-zip): Add skip conditions.

Rename project-remove-known-project to project-forget-project

* doc/emacs/maintaining.texi (Managing Projects): Ditto.

* etc/NEWS: Update accordingly.

* lisp/progmodes/project.el (project-forget-project):
Rename from 'project-remove-known-project', for consistency with
'project-remember-project' (discussed in bug#50297).

Consistently test alist keys with equal in map.el

* etc/NEWS: Announce new default behavior of map-elt and map-delete
on alists.

* lisp/emacs-lisp/map.el: Bump to version 3.2.
(map-elt): Test alist keys with equal by default.  Betray a little
bit more information in the docstring on which functions are used
for which map types.  (Bug#47368)
(map-put): Update docstring accordingly.
(map--plist-delete): Consistently test plist keys with eq.
(map-delete): Consistently test alist keys with equal.

* test/lisp/emacs-lisp/map-tests.el (test-map-elt-testfn): Update
for new map-elt behavior.
(test-map-put!-alist, test-map-delete-alist): New tests.

Remove the emoji script overrides for U+2xxx codepoints

* admin/unidata/blocks.awk: Remove the overrides for U+261D, U+26F9,
U+270C..U+270D, and U+2764.  They don't belong in the emoji script.

Fix the UK flag sequence composition regexp

* admin/unidata/emoji-zwj.awk: Fix the regexp for UK flags.
Thanks to Mattias Engdegård <mattiase@acm.org> and his magic
regexp checker.

Silence byte-compiler warning for network-stream-tests.el

The api specifically requires a symbol here, so we can't just replace
nowait with nil.

* test/lisp/net/network-stream-tests.el
(open-gnutls-stream-old-api-wait): Add explicit value for nowait
to silence byte-compiler warning due to Bug#47080.

Avoid double argument evaluation in vc-call macro

* lisp/vc/vc-hooks.el (vc-call): Ensure second argument is evaluated
only once (bug#50690).
* etc/NEWS (Change Logs and VC): Announce this change in behavior.

Make syntax-ppss more accurate for Python triple quotes (bug#49518)

By putting delimiter syntax on the last character of Python
triple-quoted strings, this makes syntax-ppss be more accurate.

Previously:

    emacs -Q something.py
    type two single quotes
    M-: (nth 3 (syntax-ppss))
    notice how the return value says you're outside a string, correctly
    type another quote
    M-: (nth 3 (syntax-ppss))
    notice how the return value says you're inside a string, correctly
    backspace the quote just entered
    M-: (nth 3 (syntax-ppss))
    notice how the return value says you're inside a string, incorrectly

With this patch the last step is corrected.  This helps things like
electric-pair-mode.  Also, the test
python-syntax-after-python-backspace now passes, again.

* lisp/progmodes/python.el (python-syntax-stringify): Put
delimiter syntax in "inner" of the surrouding triple quotes.

* test/lisp/progmodes/python-tests.el
(python-syntax-after-python-backspace): Passes again.

Expand and improve electric-pair-mode and Python testing (bug#49518)

In python-tests.el, the triple-quote pairing tests are passing
incorrectly, i.e. the auto-pairing functionality they purport to guard
isn't really working for users trying it interactively.  Added a new
failing test, soon to be fixed.

In electric-tests.el, added tests for Python, too.

* test/lisp/electric-tests.el (define-electric-pair-test): Also run
main tests for python-mode.  (pair-some-quotes-skip-others): Test
another slightly different pairing.

* test/lisp/progmodes/python-tests.el
(python-triple-double-quote-pairing): Rename from
python-triple-quote-pairing.
(python-triple-single-quote-pairing): New test.

Add docstring for 'electric-pair-p-s-i-f' and minor refactor

Extract the "open newline between pairs behaviour" into its own
function, electric-pair-open-newline-between-pairs-psif.

* lisp/elec-pair.el (electric-pair-post-self-insert-function): Add
docstring.
(electric-pair-open-newline-between-pairs-psif): New function.
(electric-pair-mode): Add/remove electric-pair-open-newline-between-pairs-psif

Speed up test/lisp/electric-tests.el when run interactively

'blink-paren-function' and its timers could sometimes interfere with
the tests and slow them down significantly.

* test/lisp/electric-tests.el (call-with-saved-electric-modes):
Bind blink-paren-function to nil.

; Minor checkdoc fixes in url/*.el

Fix whitespace-report window creation

* lisp/whitespace.el (whitespace-display-window): Avoid creating
many buffers if called many times (bug#50716).

Use `special-mode' for whitespace-report

* lisp/whitespace.el (whitespace-report-region): Use
`special-mode' instead of `fundamental-mode' (bug#50715).

Inhibit warning in mm-inline-wash-with-file from previous change

* lisp/gnus/mm-view.el (mm-inline-wash-with-file): Inhibit warning
about previous lexical fixup.

Fix problems with non-ASCII non-encoded PGP names

* lisp/epg.el (epg-signature-to-string): User IDs may be
non-encoded, non-ASCII (bug#50706).

Fix typo in tex--prettify-symbols-alist

* lisp/textmodes/tex-mode.el (tex--prettify-symbols-alist): Fix
varsigma typo (bug#50710).

Fix lexical fallout in mm-inline-wash-with-file

* lisp/gnus/mm-view.el (mm-inline-wash-with-file): This is only
called from the `links' handler, and it passes in `file' expecting
that to be dynamically bound.  Which is a very, very confusing
interface, but make that work again, anyway.

Make dired-compress-file query for a directory to uncompress to

* lisp/dired-aux.el (dired-compress-file-suffixes): Specify the
directory in the tar targets.
(dired-uncompress-file): New function (bug#47058).  This asks what
directory to uncompress to.
(dired-compress-file): Use it.

Clear netrc cache in auth-source test

* test/lisp/auth-source-tests.el
(auth-source-test-netrc-create-secret): Clear the netrc cache, too.

Only search netrc in the netrc tests

* test/lisp/auth-source-tests.el
(auth-source-test-netrc-create-secret): Only search netrc.

Remove some last calls to Gnus group name encoding

This should have been part of cb12a84f2c

* lisp/gnus/gnus-msg.el (gnus-summary-resend-message-insert-gcc,
gnus-inews-do-gcc): Don't encode group names.

; Mention it in NEWS too

New command: project-find-dir

* doc/emacs/maintaining.texi (Project File Commands):
Mention the new command and update the bindings information.

* lisp/progmodes/project.el (project-find-dir):
New command (bug#43153).
(project-prefix-map): Use 'd' as its binding.
Move 'project-dired' to 'D'.
(project-switch-commands):
Replace 'project-dired' with 'project-find-dir'.

Support for Unicode emoji sequences

This covers both sequences using Zero-Width-Joiner codepoints and
those without. Bug#39799, I hope.

* .gitignore: Add emoji-zwj.el
* admin/notes/unicode: Add emoji-zwj-sequences.txt and
emoji-sequences.txt references.  Describe how to test after updating
to a newer Unicode version.
* admin/unidata/Makefile.in (all): add emoji-zwj.el as a dependency.
(emoji-zwj.el): Add target plus rules for building.
(gen-clean): Add emoji-zwj.el.
* admin/unidata/README: Add emoji-zwj-sequences.txt and
emoji-sequences.txt references.
* admin/unidata/blocks.awk: Force emoji script to be used for certain
codepoints that are used by the Unicode sequences.
* admin/unidata/emoji-sequences.txt: New file.
* admin/unidata/emoji-zwj-sequences.txt: New file.
* admin/unidata/emoji-zwj.awk: New file.  Derives
composition-function-table rules from emoji-zwj-sequences.txt, plus
hardcodes some derived manually from emoji-sequences.txt.
* etc/NEWS: Announce change.
* lisp/international/characters.el: Load the generated emoji-zwj.el
* src/Makefile.in (emoji-zwj): New target.
(temacs): Add emoji-zwj as a dependency.

No longer raise error when http authentication failed

* lisp/url/url-http.el (url-http-handle-authentication): Return t
instead of raising an error, instructing the caller to invoke the
request specific error handler (bug#50511).

; admin/unidata/README: remove mistaken addition of local file

Add a note about testing out-of-tree builds

* CONTRIBUTE: Ask contributors to test out-of-tree builds when
making build system changes.

Base emoji script membership on Emoji_Presentation

The Emoji property describes which codepoints can be displayed as
emoji, but Emoji_Presentation governs which are displayed as emoji by
default.

* admin/notes/unicode: Adjust check-emoji-coverage to look in the
Emoji_Presentation sections of emoji-data.txt
* admin/unidata/blocks.awk: Assign emoji script using the
Emoji_Presentation section.

; admin/unidata/README: sort entries

; admin/unidata/README: update file dates

I'm not sure how useful it is to keep this information in the README.
Also, add missing EastAsianWidth.txt.

Fix VC repo URL detection in bug-reference-mode

* lisp/progmodes/bug-reference.el (bug-reference-try-setup-from-vc):
Pass file or directory name in question as the first argument to the
backend's repository-url implementation (bug#50689).  Use when-let
and seq-some to flatten nested conditionals.

Fix assertion violation with zero-width :box attributes

* src/xfaces.c (merge_face_ref): Don't allow :box attribute with a
zero value.  (Bug#50699)

Remove superfluous skip in auth-source-tests.el

* test/lisp/auth-source-tests.el
(auth-source-test-netrc-create-secret): Remove superfluous skip.

Dump with `lexical-binding` bound to nil

* lisp/loadup.el (dump-mode): Temporarily bind `lexical-binding` to
nil while dumping.  Otherwise, it will be t in Emacs by default
and that is not our intention (yet).

; * src/keyboard.c (Frecursive_edit): Minor fixes of the doc string.

* lisp/tab-bar.el (tab-bar-new-tab): Add optional arg 'from-number'.

(tab-bar-mouse-context-menu): Use tab-number as an arg for
'tab-bar-duplicate-tab'.
(tab-bar-duplicate-tab): Add optional arg 'from-number'.

Add support for url-retrieve-synchronously to eww-retrieve-command (bug#50680)

* doc/misc/eww.texi (Advanced): Mention url-retrieve-synchronously
for eww-retrieve-command.

* lisp/net/eww.el (eww-retrieve-command): Add choice 'sync' for
url-retrieve-synchronously.
(eww-retrieve): Use value 'sync' for url-retrieve-synchronously.
(eww-isearch-next-buffer): Let-bind eww-retrieve-command to 'sync'.

Improve documentation of exiting recursive editing

* doc/lispref/commands.texi (Recursive Editing): Mention what happens
when throwing a string or any other value to 'exit.
* src/keyboard.c (Frecursive_edit): Document throwing a function
to 'exit (bug#49700).

Refactor minibuffer aborting

* lisp/minibuffer.el (minibuffer-quit-recursive-edit): New optional
argument to specify how many levels of recursion to quit.

* src/eval.c (internal_catch): Remove special handling of 'exit
tag (bug#49700).
* src/minibuf.c (Fabort_minibuffers): Use
minibuffer-quit-recursive-edit to quit multiple levels of minibuffer
recursion.

Fix dolist-with-progress-reporter behaviour

* subr.el (dolist-with-progress-reporter): Use the length of list
  argument as maximal value the reporter with reach

Revert "Flag checkdoc-symbol-words as a :safe variable"

There was no need for this change, as this variable was already marked
as :safe.

This reverts commit 222a7a1a8afdf6921e5981133c605c2d695e9281.

Avoid segfaults due to 'bug-reference-mode'

* src/xdisp.c (handle_fontified_prop): Set the frame's
inhibit_clear_image_cache flag around calls to
'fontification-functions', to avoid Lisp triggering the clearing
of image and/or face caches behind redisplay's back.  (Big#50571)

Fix blocks.awk wrt to Emoji characters

* admin/unidata/blocks.awk: Fix emoji-data.txt processing for
older Awks.

Do not save empty passwords in auth-source-search

* lisp/auth-source.el (auth-source-netrc-create)
(auth-source-secrets-create): Set :save-function only for non
empty passwords.

* lisp/net/tramp.el (tramp-read-passwd): Don't save empty passwords.

* test/lisp/auth-source-tests.el
(auth-source-test-secrets-create-secret): Adapt test.
(auth-source-test-netrc-create-secret): New test.

Be explicit about missing sections in eshell manual

* doc/misc/eshell.texi (Writing a module, Module testing)
(Directory handling, Key rebinding, Smart scrolling)
(Terminal emulation): Explicitly say that these sections remain to
be written.  (Bug#49306)

* lisp/progmodes/elisp-mode.el (elisp-context-menu): Improve menu items.

Fix build with native compilation on Cygwin

* src/Makefile.in (emacs$(EXEEXT)) [CYGWIN]: Rebase the *.eln
files after they are all created, to avoid fork problems later
in the build.  (Bug#50666)

; Fix typo in package.el doc string

* lisp/emacs-lisp/package.el (package-archive-column-width): Fix
copy-paste in doc string (bug#50678).

Copyright-paperwork-exempt: yes