Also check for needed seccomp macros.

It looks like these are not available on some versions of GNU/Linux,
breaking the build.

* configure.ac: Also check for needed seccomp macros.
* src/emacs.c (SECCOMP_USABLE): New macro.
(usage_message, main, standard_args): Use it.

Fix handling of mouse clicks on tab-bar buttons

* src/xdisp.c (note_mouse_highlight): Don't attempt to highlight
tab-bar buttons.
(note_tab_bar_highlight): Function deleted: it had no effect on
display of tab-bar buttons.
(tab_bar_item_info): Mention all arguments in the commentary.
(get_tab_bar_item): Don't pay attention to mouse-highlight
information; instead, compare the button's index with the one
recorded in f->last_tab_bar_item.
(handle_tab_bar_click): Don't attempt to show tab-bar buttons in
pressed or released state: that isn't supported.  Determine
whether to generate a tab-bar button click based on DOWN_P
argument, not on mouse-highlight, which has no effect on tab-bar
display.  (Bug#47581)

; * lisp/net/shr.el (shr-insert-document): Fix last change.

* lisp/net/shr.el (shr-insert-document): Explain why bidi-display-reordering

Add new icomplete-vertical-mode

Co-authored-by: João Távora <joaotavora@gmail.com>
* lisp/icomplete.el (icomplete-completions): Consider icomplete-vertical-mode.
(icomplete-vertical-mode-minibuffer-map): New map.
(icomplete--vertical-minibuffer-setup): New helper.
(icomplete-vertical-mode): New minor mode.

* doc/emacs/buffers.texi (Icomplete): Mention icomplete-vertical-mode.

* etc/NEWS: Mention icomplete-vertical-mode

* lisp/misearch.el (multi-isearch-read-buffers): Fix last change

These are not buffers but buffer names.

* src/emacs.c (read_full): Add a few assertions.

* lisp/cus-dep.el: Use lexical-binding

* lisp/misearch.el: Use lexical-binding

(multi-isearch-read-buffers, multi-isearch-read-files):
Replace `add-to-list` with `cl-pushnew` for use on a local variable.

* src/emacs.c (load_seccomp): Add a useful assertion.

* src/emacs.c (load_seccomp): Fix condition.

* lisp/ps-bdf.el: Use lexical-binding

* lisp/informat.el: Use lexical-binding

* lisp/loadup.el: Use lexical-binding

* lisp/jka-compr.el: Use lexical-binding

Prefer #' to quote function names.

* etc/NEWS: Extend paragraph about &define form and backtracking

; Fix copyright years

Convert CC Mode to lexical binding in Emacs

lisp/progmodes/cc-align.el, lisp/progmodes/cc-awk.el,
lisp/progmodes/cc-bytecomp.el, lisp/progmodes/cc-cmds.el,
lisp/progmodes/cc-defs.el, lisp/progmodes/cc-engine.el,
lisp/progmodes/cc-fonts.el, lisp/progmodes/cc-guess.el,
lisp/progmodes/cc-langs.el, lisp/progmodes/cc-menus.el,
lisp/progmodes/cc-mode.el, lisp/progmodes/cc-styles.el,
lisp/progmodes/cc-subword.el, lisp/progmodes/cc-vars.el: Mark these files with
a `lexical-binding' setting in line 1.

lisp/progmodes/cc-align.el, lisp/progmodes/cc-engine.el,
lisp/progmodes/cc-vars.el (c-syntactic-context, c-syntactic-element): Declare
these as special variables.

lisp/progmodes/cc-bytecomp.el (cc-bytecomp-debug-msg): prefix the parameter
ARGS with a _, and remove an `ignore' call.

lisp/progmodes/cc-cmds.el (c-where-wrt-brace-construct): Remove `kluge-start',
an unused variable.
(c-while-widening-to-decl-block): Add an extra parameter, which suppresses
the generation of a setting of variable `where'.
(c-defun-name-and-limits): Remove variable `where' from the function and use
the new argument to the previous macro.

lisp/progmodes/cc-engine.el (c-cache-to-parse-ps-state): Remove two unneeded
variables, `last' and `intermediate'.

lisp/progmodes/cc-fonts.el (c-font-lock-c++-using): Remove unused variable.

lisp/progmodes/cc-langs.el (c-vsemi-status-unknown-p-fn): Replace the doc
string with the more precise one from stand-alone CC Mode.

lisp/progmodes/cc-styles.el (c-set-offset): Give the `ignored' parameter a
leading _.

Add a helper binary to create a basic Secure Computing filter.

The binary uses the 'seccomp' helper library.  The library isn't
needed to load the generated Secure Computing filter.

* configure.ac: Check for 'seccomp' header and library.

* lib-src/seccomp-filter.c: New helper binary to generate a generic
Secure Computing filter for GNU/Linux.

* lib-src/Makefile.in (DONT_INSTALL): Add 'seccomp-filter' helper
binary if possible.
(all): Add Secure Computing filter file if possible.
(seccomp-filter$(EXEEXT)): Compile helper binary.
(seccomp-filter.bpf seccomp-filter.pfc): Generate filter files.

* test/src/emacs-tests.el (emacs-tests/seccomp/allows-stdout)
(emacs-tests/seccomp/forbids-subprocess): New unit tests.

* test/Makefile.in (src/emacs-tests.log): Add dependency on the helper
binary.

* src/emacs.c (load_seccomp): Fix condition.

Read file in a loop if necessary.

This allows for short reads from 'emacs_read'.

* src/emacs.c (read_full): New helper function.
(load_seccomp): Use it.

; * etc/NEWS: Fix the wording of a recently added entry.

Add support for --seccomp command-line option.

When passing this option on GNU/Linux, Emacs installs a Secure
Computing kernel system call filter.  See Bug#45198.

* configure.ac: Check for seccomp header.

* src/emacs.c (usage_message): Document --seccomp option.
(emacs_seccomp): New wrapper for 'seccomp' syscall.
(load_seccomp, maybe_load_seccomp): New helper functions.
(main): Potentially load seccomp filters during startup.
(standard_args): Add --seccomp option.

* lisp/startup.el (command-line): Detect and ignore --seccomp option.

* test/src/emacs-tests.el (emacs-tests/seccomp/absent-file)
(emacs-tests/seccomp/empty-file)
(emacs-tests/seccomp/file-too-large)
(emacs-tests/seccomp/invalid-file-size): New unit tests.
(emacs-tests--with-temp-file): New helper macro.

* etc/NEWS: Document new --seccomp option.

Edebug: Disable backtracking when hitting a &define keyword.

Edebug doesn't deal well with backtracking out of definitions, see
Bug#41988.  Rather than trying to support this rare situation (e.g. by
implementing a multipass parser), prevent it by adding an implicit
gate.

* lisp/emacs-lisp/edebug.el (edebug--match-&-spec-op): Disable
backtracking when hitting a &define keyword.

* test/lisp/emacs-lisp/edebug-tests.el
(edebug-tests-duplicate-&define): New unit test.
(edebug-tests--duplicate-&define): New helper macro.

* doc/lispref/edebug.texi (Backtracking): Mention &define in the list
of constructs that disable backtracking.

* etc/NEWS: Document new behavior.

* lisp/gnus/nnagent.el: Fix spurious empty line at BOB

* lisp/edmacro.el: Use lexical-binding

(edmacro-finish-edit, edmacro-parse-keys): Use `match-string`.

* lisp/files-x.el: Use lexical-binding

* lisp/ps-mule.el: Use lexical-binding

(ps-mule-encode-header-string, ps-mule-begin-job): Use `pcase`.

Autoload list-colors-display.

* lisp/facemenu.el (list-colors-display): Autoload, it is mentioned
in (info "(emacs)Colors for Faces"), and to be generally available.

Tramp: fix location of files on W32

* lisp/net/tramp.el:
* lisp/net/tramp-sh.el: Use (eq system-type 'windows-nt) where appropriate.
(tramp-completion-function-alist-ssh): Fix location of files on W32.

Further fix of hostname completion on MS Windows

* lisp/net/tramp.el (tramp-completion-file-name-regexp-simplified)
(tramp-completion-file-name-regexp-separate): Fix W32 hostname/method
completion for simplified and separate syntaxes (same as the previous change
to default syntax).

Copyright-paperwork-exempt: yes

Fail earlier if stale Flymake report functions called

If a Flymake backend calls a "stale" report function,
flymake--handle-report might be called for a backend function that is
no longer in the flymake--backend-state hash table.  This patch makes
that erroneous situation slightly more explicit.

* lisp/progmodes/flymake.el (flymake--handle-report): Improve
error reporting.

Don't stop when before space or closing paren

* lisp/progmodes/elisp-mode.el (elisp-completion-at-point):
Don't stop when before space or closing paren (bug#47665).

CC Mode: fix c-where-wrt-brace-construct to cope with class declarations

Make the function correctly recognize a brace block preceded by an
introductory line without a parameter list.

* lisp/progmodes/cc-cmds.el (c-where-wrt-brace-contruct): Reintroduce the use
of c-beginning-of-decl-1, which was removed some weeks ago, in place of a
c-syntactic-skip-backward.  Reformulate the code generally.

Fix condition-case optimiser bug

* lisp/emacs-lisp/byte-opt.el (byte-optimize-form-code-walker): Don't
perform incorrect optimisations when a condition-case variable shadows
another lexical variable.
* test/lisp/emacs-lisp/bytecomp-tests.el (bytecomp-tests--test-cases):
New test case.

Better compiler warning tests

These changes allow all bytecomp-tests to be run interactively.

* test/lisp/emacs-lisp/bytecomp-tests.el (bytecomp--with-warning-test)
(bytecomp--define-warning-file-test): Interpret any space in the
pattern as arbitrary whitespace to tolerate line breaks.
Don't abuse the expected-failure mechanism when checking
for the expected absense of a warning.
(bytecomp/*.el): Rewrite patterns to work with line breaks
in the middle.

Clean up bytecomp-tests.el

Now all test cases are run with both lexical and dynamic binding
where applicable, comparing interpreted against compiled results.
Previously, almost all tests were only run with dynamic binding
which was definitely not intended.

* test/lisp/emacs-lisp/bytecomp-tests.el
(byte-opt-testsuite-arith-data): Rename to bytecomp-tests--test-cases.
(bytecomp-check-1, bytecomp-explain-1, bytecomp-tests)
(bytecomp-lexbind-tests, bytecomp-lexbind-check-1)
(bytecomp-lexbind-explain-1): Remove.
(bytecomp-tests--eval-interpreted, bytecomp-tests--eval-compiled)
(bytecomp-tests-lexbind, bytecomp-tests-dynbind)
(bytecomp-tests--test-cases-lexbind-only): New.

Make refer-every into obsolete alias for seq-every-p

* lisp/textmodes/refer.el (refer-every): Make into obsolete
function alias for seq-every-p.  Update single caller.

Remove redundant #' before lambda in ibuf-*.el

* lisp/ibuf-ext.el (ibuffer-included-in-filters-p)
(ibuffer-included-in-filter-p-1, ibuffer-do-kill-lines)
(ibuffer-jump-to-buffer, ibuffer-mark-on-buffer)
(ibuffer-mark-by-name-regexp, ibuffer-mark-by-mode-regexp)
(ibuffer-mark-by-content-regexp, ibuffer-mark-by-mode)
(ibuffer-mark-modified-buffers, ibuffer-mark-unsaved-buffers)
(ibuffer-mark-dissociated-buffers, ibuffer-mark-help-buffers)
(ibuffer-mark-compressed-file-buffers, ibuffer-mark-old-buffers)
(ibuffer-mark-special-buffers, ibuffer-mark-read-only-buffers)
(ibuffer-mark-dired-buffers, ibuffer-do-occur):
* lisp/ibuf-macs.el (ibuffer-save-marks, define-ibuffer-sorter)
(define-ibuffer-op): Remove redundant #' before lambda.

Don't preserve window-line in tabulated-list-print

* lisp/emacs-lisp/tabulated-list.el (tabulated-list-print): Don't
try to preserve window-line.  (Bug#42747)

Use lexical-binding in winner.el

* lisp/winner.el: Use lexical-binding.  Remove redundant :group
args.
(winner-set, winner-mode-map): Quote function symbols as such.

Merge branch 'vhdl-mode-lexbind' into trunk

Use lexical-binding in cmuscheme.el

* lisp/cmuscheme.el: Use lexical-binding.  Doc fixes.  Remove
redundant :group args.  Quote function symbols as such.

* lisp/progmodes/cmacexp.el: Use lexical-binding.

Use lexical-binding in foldout.el

* lisp/foldout.el: Use lexical-binding.  Doc and formatting fixes.
Quote function symbols as such.

Use lexical-binding in loadhist.el and add tests

* lisp/loadhist.el: Use lexical-binding.
* test/lisp/loadhist-tests.el: New file.

Self-TCO in `condition-case` error handlers

* lisp/emacs-lisp/cl-macs.el (cl--self-tco): Recognise
`condition-case` handlers as being in the tail position.
* test/lisp/emacs-lisp/cl-macs-tests.el (cl-macs--labels):
Extend test.

Fix hostname completion on MS Windows

* lisp/net/tramp.el (tramp-completion-file-name-regexp-default):
Handle volume letter being added to paths for file name completion on W32
systems.  This fixes hostname (and method) autocomplete on W32.

Copyright-paperwork-exempt: yes

* test/lisp/shadowfile-tests.el: Fix recent test failures

(shadow--tests-cleanup): `shadow-hashtable` is now a hash table (duh!).

* lisp/progmodes/vhdl-mode.el: Use lexical-binding

Use #' to quote function names to get better compiler diagnostics.
Wrap some lines to avoid arguments "hidden" in positions that are easy
to misread.
Prefix unused arguments with a semi-colon to silence compiler warnings.
Fix a few comments that used ;;; even though they were not headings.

(vhdl-emacs-21): Delete variable.
Replace all uses with (not (featurep 'xemacs)) instead since `vhdl-mode`
has been incompatible with Emacs<21 for more than 10 years already.
(vhdl-prepare-search-1): Add Edebug declaration.
(vhdl-prepare-search-2): Add Edebug declaration and use
`with-syntax-table`.
(vhdl-visit-file): Add Edebug and indentation declaration.
Move the bulk of the code to a function for easier debugging.
(vhdl--visit-file): New function extracted from `vhdl-visit-file`.
Be careful not to modify syntax tables in unrelated buffers.
(vhdl-speedbar-refresh): Remove unused var `pos`.
(vhdl-backward-sexp): Remove unused var `last-forward`.
(vhdl-electric-tab, vhdl-minibuffer-tab, vhdl-line-expand):
Rename arg to avoid conflict with the `prefix-arg`
global variable.
(vhdl-align-region-1): Remove unused var `indent`.
(vhdl-character-to-event): Actually give a body to that poor function.
(vhdl-template-context): Remove unused vars `entity-exists` and `string`.
(vhdl-template-group): Remove unused var `start`.
(vhdl-template-argument-list): Remove unused var `start`.
(vhdl-port-paste-context-clause): Remove unused var `margin`.
(vhdl-port-paste-testbench): Remove unused var `source-buffer`.
(vhdl-hs-minor-mode): Declare function `hs-hide-all`.
(vhdl-get-hierarchy): Rename arguments `ent-alist`, `conf-alist`, and
`conf-key` and bind those dynamically scoped var via `let` instead
since arguments can't be dynamically scoped.
(vhdl-speedbar-insert-hierarchy, vhdl-compose-configuration-architecture):
Same thing with arguments `ent-alist` and `conf-alist`.
(vhdl-cache-version): Declare variable.
(speedbar-expand-line, speedbar-edit-line): Declare functions.
(vhdl-speedbar-update-current-unit): Declare before first use.
(vhdl-compose-new-component): Remove unused var `project`.
(lazy-lock-minimum-size): Declare variable.
(vhdl-submit-bug-report): Declare variable `reporter-prompt-for-summary-p`.

Revert "Load all generic-x.el modes unconditionally"

This reverts commit 0161c9df6edc02db6bd8871b00df522dd0699157.

* lisp/shadowfile.el: Use lexical-binding

Delete redundant `:group` args.

(shadow-hashtable): Make it an actual hash-table.
(shadow-shadows-of, shadow-invalidate-hashtable): Adjust accordingly.
(shadow-insert-var): Strength-reduce `eval` to `symbol-value`.
(shadow--save-buffers-kill-emacs): New function extracted from
`shadow-save-buffers-kill-emacs`.
(shadow-save-buffers-kill-emacs): Use it and use `save-buffers-kill-emacs`.
(shadow-initialize, shadowfile-unload-function):
Use `advice-add/remove` rather than override `save-buffers-kill-emacs`
with `defalias`.

Remove redundant #' before lambda in {calendar,erc,mh-e}/*.el

* lisp/calendar/icalendar.el (icalendar--get-most-recent-observance):
* lisp/calendar/parse-time.el (parse-time-rules):
* lisp/erc/erc-dcc.el (pcomplete/erc-mode/DCC):
* lisp/erc/erc-track.el (erc-modified-channels-display):
* lisp/erc/erc.el (erc-toggle-debug-irc-protocol)
(erc-cmd-IGNORE, erc-cmd-JOIN, erc-default-server-handler)
(erc-banlist-update):
* lisp/mh-e/mh-search.el (mh-search, mh-mairix-convert-to-sop*)
(mh-index-create-sequences):
* lisp/mh-e/mh-thread.el (mh-toggle-threads, mh-thread-generate)
(mh-thread-prune-containers, mh-thread-sort-containers):
* lisp/mh-e/mh-utils.el (mh-sub-folders): Remove redundant #' before
lambda.

Terminate isearch when point has moved to another buffer

* lisp/isearch.el (isearch-post-command-hook): Terminate isearch
when the command just executed has moved point to another buffer.
https://lists.gnu.org/archive/html/emacs-devel/2021-04/msg00309.html

User option to move to another match when changing direction in isearch.

* lisp/isearch.el (isearch-direction-change-changes-match):
New user option (bug#47599).
(isearch-repeat): Use the new option.
(isearch-repeat-forward, isearch-repeat-backward): Adapt to the
new option.

* etc/NEWS: Mention the new user option.

* doc/emacs/search.texi: Document the new user option.

* lisp/repeat.el (repeat-post-hook): Check for prefix-arg.

This is instead of checking for a list of argument-related commands
that set prefix-arg anyway.

* lisp/repeat.el (repeat-post-hook): Skip repeating in minibuffer (bug#47566).

(repeat-map)<defvar>: Add docstring.

* lisp/progmodes/vhdl-mode.el: Use progress-reporter

This was actually prompted by a backward compatibility problem
(because of the use of Emacs-27's `time-convert`).  The new code
seems to work fine in Emacs-25.
It also fixes a minor bug that made the echo area messages of
`vhdl-indent-region` compete with those of `indent-region`.

(vhdl-progress-info): Delete variable.
(vhdl--progress-reporter): New var to replace it.
(vhdl-update-progress-info): Delete function.
(vhdl-indent-line): Call progress-reporter-update instead.
(vhdl-indent-region): Make it an obsolete alias of `indent-region`.
Change all users.
(vhdl-align-region-groups, vhdl-align-region, vhdl-fix-case-region-1):
Use `make-progress-reporter` and `progress-reporter-update`.

* lisp/array.el: Use lexical-binding

* doc/misc/tramp.texi (Frequently Asked Questions): New item about recentf.

Revert use of powershell in Tramp, there are collateral damages

* lisp/net/tramp-sh.el (tramp-methods) <sshx, scpx>: Fix quoting
for MS Windows.
(tramp-connection-properties): Don't set "encoding-shell".
(tramp-actions-before-shell): Remove `tramp-no-job-control-regexp'.
(tramp-maybe-open-connection): Revert changes for "encoding-shell".

* lisp/net/tramp.el (tramp-no-job-control-regexp): Remove.

Don't set isearch-success in isearch-wrap functions

* lisp/comint.el (comint-history-isearch-wrap):
* lisp/simple.el (minibuffer-history-isearch-wrap):
Don't set isearch-success to t, so isearch-repeat won't skip the
beginning of the wrapped match with (forward-char (if isearch-forward 1 -1)).

Merge from origin/emacs-27

2f5f30671a (origin/emacs-27) Fix broken links in autorevert.el
673c02f6d0 * lisp/international/ja-dic-cnv.el (skkdic-convert): Doc fix.

; Merge from origin/emacs-27

The following commit was skipped:

e2d199aa44 Fix crash when using menus and tramp on NS

Merge from origin/emacs-27

3ec93bb7c2 Improve doc strings in replace.el

Clarify obsoletion messages for easy-menu-{add,remove}

* lisp/emacs-lisp/easymenu.el (easy-menu-remove, easy-menu-add):
Clarify obsoletion messages.

Update whois-server-tld

* lisp/net/net-utils.el (whois-server-tld): Update and add some
missing entries.

Fix mistakes in bytecomp-tests

* test/lisp/emacs-lisp/bytecomp-tests.el
(byte-opt-testsuite-arith-data): Fix typos and avoid errors that made
the tests less powerful than intended.

; Fix my previous change to shadowfile.el

* lisp/shadowfile.el (shadow-add-to-todo, shadow-union): Wrap call
to cl-union in nreverse for backwards-compatible ordering.

Add explicit support for C-g or ESC ESC ESC after keymap prompt

* lisp/progmodes/project.el (project-switch-project):
Add explicit support for C-g or ESC ESC ESC after keymap prompt
(bug#47620).

Allow complex key bindings in project-switch-project

* lisp/progmodes/project.el (project-switch-project): Replace
read-event with an overriding local map and read-key-sequence to allow
for complex key bindings to be read (bug#47620).

* lisp/find-file.el: Make the commands oblivious to mouse/non-mouse

(ff-find-other-file): Add `event` argument.
(ff-find-other-file-other-window): Rename from
`ff-mouse-find-other-file-other-window` and use this new argument.
(ff-mouse-find-other-file, ff-mouse-find-other-file-other-window):
Make them obsolete aliases.
(ff-upcase-p): Remove unused `start` and `end` arguments and
simplify accordingly.

* lisp/find-file.el: Use lexical-binding

Remove unused `:group` args.  Prefer #' to quote function.

(ff-special-constructs, ff-find-the-other-file, ff-get-file-name)
(ff-list-replace-env-vars, ff-cc-hh-converter): Use `match-string`.
(modula2-other-file-alist): Tighten regexps.
(ff-get-other-file, ff-find-other-file): Use dynamic scoping.
(ff-find-the-other-file): Minor simplification.
(ff-other-file-name): Delete unused function.
(ff-string-match): Don't let-bind `case-fold-search` if not needed.
(ff-basename): Make it an obsolete alias for `file-name-nondirectory`.
(ff-switch-file): Minor simplification.
(ff-list-replace-env-vars): Use [:alnum:].
(ff-upcase-p): Use [:upper:]
(ff-cc-hh-converter): Use [:upper:] and [:lower:].

* lisp/isearch.el (isearch-wrap-pause): New defcustom (bug#47599).

(isearch-repeat): Use it.
(isearch-search): Don't ding when isearch-wrap-pause is no-ding.

* lisp/progmodes/ps-mode.el: Use lexical-binding

And prefer #' to quote function names.

Fix broken links in autorevert.el

* lisp/autorevert.el (global-auto-revert-non-file-buffers):
Fix broken links.  (Bug#47621)

Fix Bug#47601 in Tramp

* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist):
Use `tramp-handle-file-newer-than-file-p'.  (Bug#47601)
(tramp-sh-handle-file-newer-than-file-p, tramp-run-test2): Remove.

* lisp/msb.el: Use lexical-binding

Remove redundant `:group` args.
(msb--add-to-menu): Strength-reduce `eval` to `symbol-value` and use `push`.
(msb--create-sort-item): Strength-reduce `eval` to `symbol-value`.
(msb-menu-bar-update-buffers): Replace `(lambda...) with a proper closure.

* lisp/hippie-exp.el: Use lexical-binding

Remove redundant `:group` args.
(make-hippie-expand-function): Turn it into a function returning
a closure.
(try-expand-all-abbrevs): Strength-reduce `eval` to `symbol-value`
and use `abbrev-table-p` rather than `vectorp`.

* lisp/comint.el: Fix understickiness of non-comint properties

When a third party package adds properties to the prompt they don't
necessarily want to be `read-nonsticky` (e.g. for the `cursor-intangible`
property), so replace the catchall `rear-nonsticky t` with an
actual list of the properties that we want to be `rear-nonsticky`.

(comint-send-input, comint-output-filter): Don't mark
all properties as non-sticky.

* lisp/tab-bar.el: Add repeat-map keymaps.

* lisp/tab-bar.el (tab-bar-switch-repeat-map): New keymap used for
'tab-next' and 'tab-previous'.
(tab-bar-move-repeat-map): New keymap used for 'tab-move'.
https://lists.gnu.org/archive/html/emacs-devel/2021-03/msg01103.html

* lisp/repeat.el (repeat-keep-prefix): New defcustom.

* lisp/repeat.el (repeat-map): New autoloaded global variable.
(repeat-post-hook): Use 'repeat-map' when non-nil
and reset it to nil afterwards.
(repeat-post-hook): Keep the current prefix when
'repeat-keep-prefix' is non-nil.

* lisp/window.el (other-window-repeat-map): Add "O" that sets
'repeat-map' to 'other-window-repeat-map' before calling
'(other-window -1)'.

https://lists.gnu.org/archive/html/emacs-devel/2021-03/msg01387.html

* lisp/repeat.el (repeat-post-hook): Fix key lookup.

* lisp/repeat.el (repeat-post-hook): Rename let-bound repeat-map to rep-map.
Define let-bound prefix-command-p.  Use lookup-key with
this-single-command-keys instead of last-command-event.
Don't show message when typing prefix keys.
https://lists.gnu.org/archive/html/emacs-devel/2021-04/msg00083.html

Use powershell for Tramp on MS Windows

* lisp/net/tramp-sh.el (tramp-use-ssh-controlmaster-options):
Nil on MS Windows.
(tramp-connection-properties): Add "encoding-shell".
(tramp-maybe-open-connection): Use it.  Change exit handling.
(tramp-actions-before-shell): Add `tramp-no-job-control-regexp'.

* lisp/net/tramp.el (tramp-methods): Adapt docstring.
(tramp-no-job-control-regexp): New defcustom.
(tramp-get-debug-buffer): Set coding system.

Do not search the global keymap in project--keymap-prompt

* lisp/progmodes/project.el: (project--keymap-prompt) Pass
project--keymap-prompt as a list to where-is-internal so that the
global keymap is not searched at all (bug#47501).

Don't call `image-toggle-display-text' when toggling

*lisp/image-mode.el (image-mode-to-text): Do not call the
image-toggle-display-text twice when toggle image display (bug#47521).

Fix cd to directories called "eshell" in eshell

* lisp/eshell/em-script.el (eshell-script-initialize): Allow
changing directory to directories called "eshell" (bug#47547).

Copyright-paperwork-exempt: yes

* lisp/international/ja-dic-cnv.el (skkdic-convert): Doc fix.

Remove redundant #' before lambda in calc/*.el

* lisp/calc/calc-alg.el (math-defsimplify):
* lisp/calc/calc-ext.el (math-defintegral, math-defintegral-2):
* lisp/calc/calc-prog.el (math-do-arg-check): Remove redundant #'
before lambda.

* lisp/shadowfile.el (cl-lib): Revert removing require.

* lisp/pcomplete.el: Remove aliases commented out for 20 years.

Remove local uniquify functions in favour of seq-uniq

* lisp/emacs-lisp/seq.el (seq-uniq): Add autoload cookie.
* lisp/pcomplete.el: (pcomplete-uniquify-list): Use seq-uniq.
* lisp/eshell/esh-util.el (eshell-uniqify-list)
(eshell-uniquify-list):
* lisp/nxml/rng-util.el (rng-uniquify-equal):
* lisp/progmodes/idlwave.el (idlwave-uniquify):
* lisp/textmodes/artist.el (artist-uniq): Make into obsolete
function aliases for seq-uniq.  Update callers.
* lisp/nxml/rng-util.el (rng-uniquify-eq): Make obsolete in favor
of seq-uniq.  Update callers.

Obsolete local set difference functions in favor of seq-difference

* lisp/emacs-lisp/seq.el (seq-difference): Add autoload cookie.
* lisp/gnus/gnus-range.el (gnus-set-difference):
* lisp/gnus/spam.el (spam-set-difference): Make obsolete in favor
of seq-difference.  Update callers.

Obsolete local list functions in shadowfile.el

* lisp/shadowfile.el (shadow-union): Make obsolete in favour of
cl-union.  Update callers.
(shadow-find): Make into obsolete function alias for seq-find.
Update callers.
(cl-lib): Remove unnecessary require.

* test/infra/Dockerfile.emba (emacs-gnustep): Do not run parallel make.

Remove code commented out since 1995 from ediff-util.el

* lisp/vc/ediff-util.el (ediff-load-hook): Remove code commented out
since the file was added in 1995.

Replace local intersection functions with seq-intersection

* lisp/doc-view.el (doc-view-intersection):
* lisp/gnus/gnus-range.el (gnus-intersection):
* lisp/htmlfontify.el (hfy-interq):
* lisp/loadhist.el (file-set-intersect):
* lisp/mail/smtpmail.el (smtpmail-intersection): Make obsolete in
favor of seq-intersection.  Update all callers.

* lisp/url/url-dav.el (url-intersection): Redefine as obsolete
function alias for seq-intersection.  Update callers.

* lisp/mpc.el (mpc-intersection, mpc-cmd-list, mpc-reorder):
Use seq-intersection.

Make ediff-copy-list alias obsolete

* lisp/vc/ediff-mult.el (ediff-intersect-directories)
(ediff-get-directory-files-under-revision): Don't use above
obsolete alias.
* lisp/vc/ediff-util.el (ediff-copy-list): Make alias obsolete.

* lisp/htmlfontify.el (hfy-triplet-regex): Use rx.

* etc/NEWS: Add entry for new SVG icons in customize.