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This reverts commit 9f9ce631.

It's still a bottleneck, but so are mapcar (with its effect on GC) and
concat. So our limits show in several places at once.

* lisp/progmodes/project.el (project-switch-to-buffer):
Don't filter based on default-directory
(https://lists.gnu.org/archive/html/emacs-devel/2020-07/msg00075.html).
(project-switch-to-buffer): Ditto.

* lisp/progmodes/verilog-mode.el (verilog-auto-inst): Support regexp of
what AUTOINST I/O to include, issue #1682.  Reported by Mrainy.
(verilog-font-lock-keywords-1): Fix highlighting module names with no
following (, issue #1679.  Reported by Vinam Arora.
(verilog-font-lock-keywords) Adds syntax highlighting for identifiers in
declaration statements, #1678.
(verilog-calculate-indent, verilog-inject-arg)
(verilog-keywords, verilog-showscopes): Support AMS
connectmodule/endconnectmodule, #1665. Reported by Dan McMahill.

* test/lisp/emacs-lisp/bytecomp-tests.el (bytecomp-check-1)
(bytecomp-explain-1, test-byte-opt-arithmetic, bytecomp-lexbind-check-1)
(bytecomp-lexbind-explain-1):
If an expression raises an error when evaluated, don't treat it as if
it had succeeded with the value nil; use 'bytecomp-check-error' as the
result instead.

With bignums, the set of representable integers is no longer
platform-dependent, and since we use nothing but IEEE754 64-bit
floats, all numbers are now portable.  Take advantage of this fact
to simplify constant-folding in the byte compiler, allowing it to
be applied more widely.

* lisp/emacs-lisp/byte-opt.el (byte-opt--portable-max)
(byte-opt--portable-min, byte-opt--portable-numberp): Remove.
(byte-opt--arith-reduce, byte-optimize-minus, byte-optimize-1+)
(byte-optimize-1-): Simplify: any number will do, and if N is a
number, then so are -N, N+1 and N-1.

* lisp/progmodes/cc-engine.el (c-looking-at-bos): Remove.
(c-at-expression-start-p): Make obsolete, with no alternative function.

* lisp/progmodes/js.el (js-mode): Use "\\(?:" in the value of
comment-start-skip rather than "\\(", fixing the second half of bug #41952.
Call c-foreign-init-lit-pos-cache and install c-foreign-truncate-lit-pos-cache
on before-change-functions, to connect up correctly with CC Mode's filling
mechanism.

* lisp/textmodes/mhtml-mode.el (mhtml--crucial-variable-prefix): Add prefixes
"adaptive-fill-", "fill-", "normal-auto-fill-function" and "paragraph-" to
pull in variables crucial to filling.
(mhtml-syntax-propertize): Read the current submode from the piece of text
being propertized rather than one character before it, and do so before
erasing the submode text-property.
(mhtml-mode): Set the js-mode value of auto-fill-function to js-do-auto-fill.
Correctly initialize and use CC Mode's filling facilities, as above.

Also add functions to enable correct use of CC Mode's filling functionality
from major modes which don't initialize CC Mode fully.  These modes are
currently js-mode and mhtml-mode.

* lisp/progmodes/cc-langs.el (comment-start-skip): Replace "\\(" by "\\(?:" so
that (match-end 1) isn't falsely taken to be the start of the comment.

* lisp/progmodes/cc-engine.el (c-foreign-truncate-lit-pos-cache)
(c-foreign-init-lit-pos-cache): New functions.

* lisp/simple.el (read--expression): Set syntax table to
'emacs-lisp-mode-syntax-table' when reading a Lisp expression
from the minibuffer.  (Bug#41781)

Copyright-paperwork-exempt: yes

* admin/nt/dist-build/README-windows-binaries:

* configure.ac (PTY_TTY_NAME_SPRINTF): OpenBSD has posix_openpt
nowadays.  (Bug#42059)

Copyright-paperwork-exempt: yes

* lisp/window.el (ctl-x-4-map): Bind 'C-x 4 1' to 'same-window-prefix'.

* doc/emacs/windows.texi (Pop Up Window): Add 'C-x 4 4' and 'C-x 4 1'.
* doc/emacs/frames.texi (Creating Frames): Add 'C-x 5 5'.
(Tab Bars): Add 'C-x t t'.

* lisp/tab-bar.el (tab-bar-new-tab-to): Set frame parameter
tab-bar-lines to 1 when tab-bar-show is the same as number of tabs.
(tab-bar-close-tab, tab-bar-close-other-tabs): Set frame parameter
tab-bar-lines to 0 when tab-bar-show is the same as number of tabs.

Copyright-paperwork-exempt: yes

Do this by recognising that unterminated strings in a buffer are typically
going to be few and close together.  Also optimize code for C++ attributes.

* lisp/progmodes/cc-defs.el (c-previous-single-property-change): New macro.
(c-put-syn-tab, c-clear-syn-tab): Turned from macros into functions, and moved
to cc-mode.el.
(c-clear-syn-tab-properties): Amended to use c-min/max-syn-tab-mkr.
(c-with-extended-string-fences): Removed.

* lisp/progmodes/cc-engine-el (c-enclosing-c++-attribute): Rewritten for
speed.
(c-slow-enclosing-c++-attribute): Removed.
(c-semi-pp-to-literal): Remove a superfluous call to
c-with-extended-string-fences.

* lisp/progmodes/cc-mode.el (c-min-syn-tab-mkr, c-max-syn-tab-mkr): two new
marker variables which bound the region occupied by positions with
c-fl-syn-tab text properties.
(c-basic-common-init): Initialize these two variables.
(c-fl-syn-tab-region): Removed.
(c-put-syn-tab, c-clear-syn-tab): Functions moved from cc-defs.el.
(c-clear-string-fences): Amended to use the new scheme.
(c-restore-string-fences): Now takes no arguments; amended to use the new
scheme.
(c-font-lock-fontify-region): Amended to use the new scheme.

This incorporates:
2020-06-28 getrandom: do not depend on ‘open’ on mingw
2020-06-28 getrandom: fix compilation errors on older versions of mingw
* build-aux/config.sub, lib/getrandom.c, m4/getrandom.m4:
Copy from Gnulib
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.

* nt/mingw-cfg.site (gl_cv_lib_assume_bcrypt): Set to "no" to
disable linking against bcrypt.dll.  (Bug#42095)

* src/gnutls.c (gnutls_rnd) [WINDOWSNT]: Don't define a function
pointer, and don't load it from GnuTLS DLL.
(w32_gnutls_rnd) [WINDOWSNT]: Delete unused function.
* src/fns.c (gnutls_rnd) [WINDOWSNT]: Don't redirect to
w32_gnutls_rnd.

OpenBSD has pthread_set_name_np; FreeBSD appears to have both
this call and pthread_setname_np (the latter call is used in preference).

* configure.ac: Detect pthread_set_name_np.
* sys/systhread.c:
Include <pthread_np.h> and call pthread_set_name_np if available.

* admin/merge-gnulib (GNULIB_MODULES): Add getrandom.
* doc/lispref/text.texi (Format of GnuTLS Cryptography Inputs):
Don’t say that iv-auto uses GNUTLS_RND_NONCE.  Also, don’t say
that it returns the IV’s actual value, as it never has done that.
* src/fns.c, src/sysdep.c: Include sys/random.h, for getrandom.
* src/fns.c (Fsecure_hash_algorithms): Use getrandom so that this
function does not depend on HAVE_GNUTLS3.
* src/sysdep.c: Do not include <gnutls/crypto.h>.
(random_seed) [HAVE_LRAND48]: Can be long int now.
(init_random) [!WINDOWSNT]: Use getrandom syscall instead
of opening /dev/urandom, as this works even on GNU/Linux
hosts that lack /dev/urandom.  Don’t bother with gnutls_rnd
as it’s not needed now that we have getrandom.

This incorporates:
2020-06-27 getloadavg: don’t depend on fopen-gnu
2020-06-25 c-dtoastr, c-ldtoastr: new modules
2020-06-01 getloadavg: fix double-increment bug
2020-06-01 tempname: use getrandom, not getentropy
2020-05-31 tempname: merge from glibc and coreutils
2020-05-31 getentropy: work around a macOS and Solaris problem
2020-05-31 fnmatch: merge from glibc
2020-05-30 unistd: remove conflicting declaration of getrandom
2020-05-30 don't assume that UNICODE is not defined
2020-05-29 fix compilation error on native Windows
2020-05-28 avoid dynamic loading of Windows API functions when possible
2020-05-28 at-internal: make more robust in multithreaded applications
2020-05-28 getloadavg: make more robust in multithreaded applications
2020-05-27 getloadavg: make more robust in multithreaded applications
2020-05-26 count-one-bits: fix MSVC specific code
2020-05-25 getentropy, getrandom: new modules
2020-05-24 open, openat: really support O_CLOEXEC
2020-05-23 verify: document ‘assume’ better
2020-05-21 regex: configure better with "clang -fsanitize=leak"
2020-05-21 memmem: configure better with "clang -fsanitize=undefined"
2020-05-19 ftoastr: fix ifndef typo
* build-aux/config.guess, build-aux/config.sub, doc/misc/texinfo.tex:
* lib/count-one-bits.h, lib/ftoastr.c, lib/ftoastr.h:
* lib/getloadavg.c, lib/gettimeofday.c, lib/libc-config.h:
* lib/open.c, lib/openat-proc.c, lib/tempname.c, lib/tempname.h:
* lib/unistd.in.h, lib/verify.h, m4/memmem.m4, m4/regex.m4:
* m4/unistd_h.m4:
Update from Gnulib.
* lib/getrandom.c, lib/sys_random.in.h:
* m4/getrandom.m4, m4/sys_random_h.m4:
New files, copied from Gnulib.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.

5280e118 (origin/emacs-27) ; * src/xdisp.c (pos_visible_p): Fix las...
bb1a9481 Fix posn-at-point at beginning of a display string
0c4b0336 Improve documentation of Info node movement commands
632b0119 Add Jansson dependency to Windows Build
dbfcdab8 Unbreak 'reverse-region'
c37de848 Fix typos and markup in fill column indicator docs
f61bff3e ; * CONTRIBUTE: Clarify the preferences for patch formatting.
368e1406 Avoid crashes in 'defconst'
11e3413c Fix text about Lisp archives in the Emacs FQ
4c817246 Don't use 'cl' functions in ELisp manual's examples

* src/xdisp.c (pos_visible_p): Account for the line-number width
when the display string at CHARPOS ends in a newline.  (Bug#42039)

* lisp/progmodes/project.el (project-ignores, project-find-file-in)
(project-eshell, project--read-project-list): Fix indentation.

* lisp/info.el (Info-next, Info-prev, Info-forward-node)
(Info-backward-node): More detailed descriptions of what each
commands does with respect to child and parent nodes.  (Bug#42050)

* lisp/emacs-lisp/seq.el (seq-every-p): Autoload it.  This fixes
byte-compilation warning in project.el.

* lisp/vc/vc-hooks.el (vc-known-roots):
Actually update for the change in 733921ed (bug#41821).

* lisp/progmodes/project.el (project--list): Update docstring.
(project--read-project-list): Add structure verification.

* lisp/progmodes/project.el (project-known-project-roots):
Rename from 'project-known-roots'.  Update the docstring.  Make
sure the returned value is a list of strings.  Update the caller
(bug#41821).

* lisp/progmodes/project.el (project-kill-buffers-ignores):
Rename from project-kill-buffers-skip-conditions (bug#41868).
Update both references.
Add a :package-version attribute.

* etc/NEWS: Add entry for bug-reference auto-setup.

* lisp/menu-bar.el (menu-bar-describe-menu): Improve the wording
and the help-echo of the new list-recent-keystrokes Help menu
item.  (Bug#41933)

* etc/NEWS: Call out the new menu item.

* lisp/menu-bar.el (menu-bar-describe-menu):
Add an entry for view-lossage (Bug#41933).