Fix namespacing issue in dig.el

* lisp/net/dig.el (dig-query): Rename from 'query-dig'.
(query-dig): Make into obsolete function alias for 'dig-query'.

Improve handling of xsettings events

* src/xsettings.c (xft_settings_event):
* src/xsettings.h: Return if the event was handled.
* src/xterm.c (handle_one_xevent): If it was, don't handle the
event any further.

; * lisp/net/net-utils.el: Delete code commented out since 2000.

Note also that the netstat command is officially deprecated.

Improve GCC pacification in xterm.c

* src/xterm.c (x_dnd_free_toplevels, x_composite_image):
Use UNINIT for initialization needed only to pacify GCC.
(x_dnd_free_toplevels): Add an eassume to pacify GCC 12.1 x86-64
-Wanalyzer-null-dereference.

2022-07-31  Paul Eggert  <eggert@cs.ucla.edu>

Fix time comparison in primitive-undo

* lisp/simple.el (primitive-undo): Fix time comparison.
The old code was a circa-2013 mistranslation of what used to be in
src/undo.c’s Fprimitive_undo.

Use list-form timestamps in .nnmh-articles

* lisp/gnus/nnmh.el (nnmh-update-gnus-unreads): Store list form
timestamps into .nnmh-articles, even if current-time-list is nil.
That way, older Emacs versions can read them.

Prefer ‘time-equal-p’ to ‘equal’ on timestamps

This is more robust since timestamps can have multiple forms.
* lisp/auth-source.el (auth-source-netrc-parse):
* lisp/bookmark.el (bookmark--watch-file-already-queried-p)
(bookmark-maybe-load-default-file):
* lisp/cedet/semantic/db.el (semanticdb-needs-refresh-p):
* lisp/dired.el (dired-directory-changed-p):
* lisp/files.el (dir-locals-find-file):
* lisp/gnus/gnus-util.el (gnus-cache-file-contents):
* lisp/gnus/nneething.el (nneething-create-mapping):
* lisp/gnus/nnfolder.el (nnfolder-read-folder):
* lisp/gnus/nnmaildir.el (nnmaildir--update-nov)
(nnmaildir--scan, nnmaildir-request-scan)
(nnmaildir-request-update-info):
* lisp/gnus/nnmh.el (nnmh-update-gnus-unreads):
* lisp/gnus/spam-stat.el (spam-stat-load):
* lisp/mail/mailabbrev.el (mail-abbrevs-sync-aliases):
* lisp/mail/sendmail.el (sendmail-sync-aliases):
* lisp/net/netrc.el (netrc-parse):
* lisp/nxml/rng-loc.el (rng-get-parsed-schema-locating-file):
* lisp/play/cookie1.el (cookie-snarf):
* lisp/vc/vc-cvs.el (vc-cvs-state-heuristic):
* lisp/vc/vc-hg.el (vc-hg--ignore-patterns-valid-p)
(vc-hg--cached-dirstate-search):
* lisp/vc/vc-hooks.el (vc-after-save):
Prefer ‘time-equal-p’ to ‘equal’ when comparing
timestamps for equality.

Simplify a few timestamps

* lisp/calendar/time-date.el (safe-date-to-time):
* lisp/calendar/timeclock.el (timeclock-generate-report):
* lisp/epg.el (epg--start):
* lisp/gnus/gnus-demon.el (gnus-demon-nntp-close-connection):
* lisp/gnus/gnus-util.el (gnus-date-get-time):
* lisp/gnus/nnheader.el (nnheader-last-message-time):
* lisp/gnus/nnrss.el (nnrss-request-expire-articles):
* lisp/vc/ediff-util.el (ediff-command-begin-time)
(ediff-calc-command-time, ediff-profile):
Prefer an integer like 0 to a timestamp list like (0 0)
where either will do.

Omit some (current-time) calls

* lisp/emacs-lisp/ert.el (ert-write-junit-test-summary-report):
* lisp/emacs-lisp/shortdoc.el (file):
* lisp/find-lisp.el (find-lisp-find-dired-insert-file):
* lisp/progmodes/hideif.el (hide-ifdefs):
* lisp/tar-mode.el (tar-subfile-save-buffer):
Prefer nil or omitted arg to (current-time) where this is better
or more-efficient.

* lisp/vc/vc.el: Remove stray comment hyphen.

Fix "cons up a storm" issue in type-break

* lisp/type-break.el (type-break-time-last-command)
(type-break-mode, type-break, type-break-check)
(type-break-time-sum, type-break-keystroke-reset):
Use integer timestamps; that’s good enough for this module.

Fix year-285428751 bug in hanoi-unix-64

* lisp/play/hanoi.el (hanoi-move-period, hanoi, hanoi-unix)
(hanoi-unix-64): Use integers, not floating point, to avoid
rounding errors for timestamps greater than 2**53.

* src/timefns.c (Ffloat_time): Fix doc string.

Improve time-equal-p etc. performance

* src/timefns.c (time_cmp): Return EMACS_INT, not int; no need to
change callers.  Compare (X . Z) to (Y . Z) quickly if X and Y are
fixnums.

Improve float-time etc. performance

* src/timefns.c (decode_float_time): Assume T is finite.
All callers changed.
(decode_time_components): Assume FORM is not TIMEFORM_FLOAT.
All callers changed.
(decode_lisp_time): If the specified time is a float,
signal an error if it is not finite.
(Ffloat_time): If the specified time is a float,
simply return it.

Make time arithmetic more like comparison

Since time comparison says X == X, have time arithmetic behave
similarly for X - X.  This should also be a bit faster due to not
having to test for floats and NaNs.
* src/timefns.c (time_arith, time_cmp):
Simplify by not worrying about NaNs, which are not time values.
(time_arith): Simplify by not worrying about subtracting nil from
nil; the caller now handles this.
(Ftime_subtract): Handle subtracting X from X specially.

Fix get-internal-runtime precision

* src/sysdep.c (make_lisp_s_us): Also define if HAVE_GETRUSAGE.
(Fget_internal_run_time): Don’t generate more precision than the
underlying primitives.

(time-equal-p nil X) returns nil

* src/timefns.c (Ftime_equal_p): nil compares unequal to non-nil.

Tune blv_found

* src/lisp.h (blv_found): Prefer BASE_EQ to EQ where either will do.

; * nextstep/Makefile.in: Fix last change (bug#56853).

Improve frame synchronization support on Haiku

* src/ftcrfont.c (ftcrfont_draw):
* src/haikufns.c (haiku_set_background_color):
* src/haikuterm.c (haiku_clip_to_string):
(haiku_clip_to_string_exactly):
(haiku_clear_frame_area):
(haiku_clear_frame):
(haiku_draw_box_rect):
(haiku_draw_relief_rect):
(haiku_draw_underwave):
(haiku_draw_text_decoration):
(haiku_draw_plain_background):
(haiku_draw_stipple_background):
(haiku_draw_glyph_string_foreground):
(haiku_draw_glyphless_glyph_string_foreground):
(haiku_draw_stretch_glyph_string):
(haiku_start_clip):
(haiku_end_clip):
(haiku_clip_to_row):
(haiku_draw_composite_glyph_string_foreground):
(haiku_draw_image_glyph_string):
(haiku_draw_glyph_string):
(haiku_after_update_window_line):
(haiku_draw_hollow_cursor):
(haiku_draw_bar_cursor):
(haiku_draw_vertical_window_border):
(haiku_draw_window_divider):
(haiku_scroll_bar_create):
(haiku_set_horizontal_scroll_bar):
(haiku_set_vertical_scroll_bar):
(haiku_draw_fringe_bitmap):
(haiku_scroll_run):
(haiku_read_socket):
(haiku_flash):
(haiku_clear_under_internal_border):
(haiku_scroll_bar_remove):
* src/haikuterm.h (MAKE_FRAME_DIRTY):
(FRAME_CR_CONTEXT): Don't dirty frames if not necessary.

Implement primitive frame synchronization on Haiku

Instead of relying on a compositor to do the work, we simply
wait for VBLANK and hope that the update finishes soon enough.

* doc/lispref/frames.texi (Management Parameters): Document that
frame synchronization is now supported on Haiku.

* src/haiku_support.cc (class EmacsView): New field
`use_frame_synchronization'.
(FlipBuffers): Wait for vertical blanking period.
(be_set_use_frame_synchronization): New function.
* src/haiku_support.h: Update prototypes.
* src/haikufns.c (haiku_create_frame): Set
`use-frame-synchronization'.

(haiku_set_use_frame_synchronization)
(haiku_frame_parm_handlers): New param handler.

* lisp/cedet/ede/base.el (ede-project): Fix warning when loading EDE.

; Merge from origin/emacs-28

The following commit was skipped:

78759ddcb0 * src/lisp.h (CHECK_INTEGER): Fix the predicate.  (Bug#56856)

Update publicsuffix.txt from upstream

* etc/publicsuffix.txt: Update from
https://publicsuffix.org/list/public_suffix_list.dat
dated 2022-07-28 15:23:34 UTC.

; Auto-commit of loaddefs files.

Make frame synchronization a frame parameter

* doc/lispref/frames.texi (Management Parameters): Document
`use-frame-synchronization'.
* etc/NEWS: Update entry.

* src/frame.c (frame_parms): New frame parameter
`use-frame-synchronization'.
(syms_of_frame): New defsym.
* src/haikufns.c (haiku_frame_parm_handlers):
* src/nsfns.m (ns_frame_parm_handlers):
* src/pgtkfns.c (pgtk_frame_parm_handlers):
* src/w32fns.c (w32_frame_parm_handlers): Update frame param
handlers correctly.
* src/xfns.c (x_set_use_frame_synchronization): New function.
(Fx_create_frame): Set default value of said parameter.
(x_frame_parm_handlers): Add handler.

* src/xterm.c (x_sync_wait_for_frame_drawn_event): Clear
parameter if sync fails.

Regenerate ldefs-boot.el

Allow specifying that loaddefs files shouldn't not be compiled

* lisp/emacs-lisp/loaddefs-gen.el (loaddefs-generate--rubric):
Allow specifying that we shouldn't include a no-compile cookie
(bug#53024).

Declare `key-valid-p` and `readablep` as error-free

* lisp/keymap.el (key-valid-p):
* lisp/subr.el (readablep): These functions are effect-free; declare
them correspondingly.  Note that readablep is not pure since its
return value depends on ambient state.

Make ps-def.el obsolete (part 2/2)

* lisp/obsolete/ps-def.el: Add "Obsolete-since".
* lisp/ps-print.el (ps-def): Don't require.

Make ps-def.el obsolete (part 1/2)

This file was created to maintain Emacs/XEmacs compat code more
easily, and no longer serves any purpose.  It currently contains only
obsolete function and variable aliases.

* lisp/ps-def.el: Move from here...
* lisp/obsolete/ps-def.el: ...to here.

Don't make a custom-save-icons section if there's nothing to save

* lisp/cus-edit.el (custom-save-icons): Only make an entry when
there's something to save (bug#56860).  Also autoload.

Move some definitions from ps-def.el to ps-print.el

* lisp/ps-def.el (ps-face-bold-p, ps-face-italic-p)
(ps-face-strikeout-p, ps-face-overline-p, ps-face-box-p)
(ps-color-format, ps-float-format)
(ps-generate-postscript-with-faces1): Move from here...
* lisp/ps-print.el (ps-face-bold-p, ps-face-italic-p)
(ps-face-strikeout-p, ps-face-overline-p, ps-face-box-p)
(ps-color-format, ps-float-format)
(ps-generate-postscript-with-faces1): ...to here.

Remove some leftover compat code from ps-print

* lisp/ps-def.el (ps-mark-active-p): Make obsolete in favor of
'mark-active'.  Update callers.
(ps-face-foreground-name): Make obsolete in favor of
'face-foreground'.  Update callers.
(ps-face-background-name): Make obsolete in favor of
'face-background'.  Update callers.
(ps-color-device): Make into obsolete function alias for
'display-color-p'.  Update callers.

* src/lisp.h (CHECK_INTEGER): Fix the predicate.  (Bug#56856)

Declare Tramp function for backward compatibility

* lisp/net/tramp.el (tramp-archive-file-name-handler):
* lisp/net/tramp-ftp.el (tramp-archive-file-name-handler): Declare.

Reduce internal rx autoloads

* lisp/emacs-lisp/rx.el (rx--to-expr, rx--pcase-transform):
Don't autoload.
(rx--pcase-macroexpander): Extract body into...
(rx--pcase-expand): ...a separate function, which is autoloaded.

; Use values instead of trying to ignore them

* test/lisp/subr-tests.el (test-print-unreadable-function):
* test/src/print-tests.el (test-print-unreadable-function-buffer):
Instead of binding the value of nominally side-effect-free
expressions to an ignored variable (_), make use of them.
This is more robust and provides useful extra checks in the test.

Fix electric paring in rcirc buffers

* rcirc.el (rcirc--electric-pair-inhibit): Add new predicate function.
(rcirc-mode): Use rcirc--electric-pair-inhibit.

* lisp/emacs-lisp/eieio-base.el (eieio-persistent-read): Simplify.

; Simplify two functions after recent change

* lisp/textmodes/bib-mode.el (bib-capitalize-title):
* lisp/textmodes/refbib.el (r2b-capitalize-title): Simplify.

Fix compilation warnings in tramp-loaddefs.el

* lisp/files.el (file-name-quoted-p): Autoload because it's
referred to from tramp-loaddefs.
* lisp/net/tramp.el (defvar): Put the entire form into the
loaddefs file instead of eval-and-compile -- this fixes a
dependency problem when byte-compiling the loaddefs file.
(tramp-methods, tramp-default-method-alist)
(tramp-default-user-alist, tramp-default-host-alist)
(tramp-local-host-regexp, tramp-terminal-type)
(tramp-foreign-file-name-handler-alist): Autoload to avoid
compilation warnings.  Also put (require 'cl-lib) into the
loaddefs file for the same reason.
(tramp-ensure-dissected-file-name)
(tramp-set-completion-function)
(tramp-register-foreign-file-name-handler): Autoload.

Fix org.el byte-compile warning in org-loaddefs.el

* lisp/org/org.el (org-dynamic-block-define): Autoload because
it's referred to in org-loaddefs.el.

Fix ede byte-compile warnings in loaddefs.el

* lisp/emacs-lisp/eieio.el (make-instance):
* lisp/cedet/ede/auto.el (ede-add-project-autoload): Autoload
functions referred to by ede/loaddefs.el.

Remove loaddefs debug code

* lisp/emacs-lisp/loaddefs-gen.el (loaddefs-generate--rubric):
Remove code inadvertantly checked in.

Fix cl byte-compile warning in cl-loaddefs.el

* lisp/emacs-lisp/cl-macs.el (cl--optimize)
(cl-struct-sequence-type, cl-struct-slot-offset): Autoload since
they are referred to by code in cl-loaddefs.el.

Delete additional items obsolete since 20, 21 and 22

* lisp/font-lock.el (font-lock-reference-face): Delete variable
alias obsolete since 20.3.
* lisp/progmodes/cc-cmds.el (c-toggle-auto-state): Delete alias
obsolete since 22.1.
* lisp/replace.el (query-replace-regexp-eval): Delete function
obsolete since 22.1.
(replace-count, replace-re-search-function): Doc fixes; adjust for
above deleted function.

Fix remaining byte-compile warnings in loaddefs.el

* lisp/progmodes/compile.el (compilation--default-buffer-name):
* lisp/kmacro.el (kmacro-name-last-macro):
* lisp/emacs-lisp/package.el (package--activate-all): Autoload to
avoid byte-compilation warnings when byte-compiling loaddefs.el.

Fix rx.el byte-compile warning in loaddefs.el

* lisp/emacs-lisp/rx.el (rx--to-expr, rx--pcase-transform):
Autoload to avoid warning when byte-compiling loaddefs.el.

Fix sendmail.el byte-compile warning in loaddefs.el

* lisp/mail/sendmail.el (mail-send-and-exit): Autoload since it's
referred to by autoloaded code in loaddefs.el.

tramp fixes for byte-compiling loaddefs.el

* lisp/net/tramp-archive.el (tramp-archive-file-name-handler):
Move to the main loaddefs file since it's referred to by functions
there.
* lisp/net/tramp.el (tramp-file-name-handler): Autoload to avoid
warning when byte-compiling loaddefs.el.

Fix further package.el loaddefs byte-compile warnings

* lisp/emacs-lisp/package.el (package-directory-list)
(package-quickstart-file): Specify group to avoid warning when
byte-compiling loaddefs.el.
(package-activated-list): Autoload since we're assigning the
variable from a function completely autoloaded.

Fix loaddefs byte-compile warnings from grep.el

* lisp/progmodes/grep.el (grep-highlight-matches)
(grep-match-face): Autoload to avoid byte-compile warnings from
loaddefs.el.

Fix loaddefs byte-compile warning from package.el

* lisp/emacs-lisp/package.el (package-user-dir): :group has to be
explicit for autoloaded defcustoms.

Reformulate compile-command condition

* lisp/progmodes/compile.el: Reformulate to avoid a byte-compile
warning when compiling loaddefs.el.

Delete aliases obsolete since 21.1 and 22.1

* lisp/ls-lisp.el (ls-lisp-dired-ignore-case):
* lisp/files.el (find-file-not-found-hooks): Delete variable aliases,
obsolete since 21.1 and 22.1 respectively.

Support keyboard input and display of U+1E9E

* lisp/international/latin1-disp.el (latin1-display):
* lisp/international/iso-transl.el (iso-transl-char-map)
(iso-transl-language-alist): Add U+1E9E capital sharp S.

; * src/xterm.c (XTset_vertical_scroll_bar): Fix yet another typo.

Reported by Lars Ingebrigtsen <larsi@gnus.org>.

Merge from origin/emacs-28

eb11dae499 Improve documentation of column-related functions
c95a34c960 * src/macfont.m (macfont_open): Initialize font->space_wid...
31a6a37d45 Improve indexing of keymap variables

Fix NS unexec build

* nextstep/Makefile.in (all): Only build Emacs.pdmp on pdumper
builds.

* src/sheap.h: Make STATIC_HEAP_SIZE bigger, otherwise I get:
static heap exhausted: avail 67108864 used 67101824 failed
request 20480

; * src/xterm.c (XTset_vertical_scroll_bar): Fix typo in last change.

Fix frame synchronization with scroll bar movement

* src/xfns.c (x_set_inhibit_double_buffering): Stop condeming
scroll bars.

* src/xterm.c (x_scroll_bar_create): Create an InputOnly window.
Update event masks accordingly and stop allocating back buffer.
(x_scroll_bar_remove): Stop deallocating back buffer.
(XTset_vertical_scroll_bar, x_scroll_bar_set_handle): Draw onto
the edit window so they can be synchronized with buffer flips.
(x_scroll_bar_clear): Redraw scroll bars instead of just
clearing them.
(x_scroll_bar_handle_expose, x_scroll_bar_redraw): New
functions.
(x_scroll_bar_expose, x_scroll_bar_end_update): Delete
functions.
(handle_one_xevent): Update exposure logic accordingly.

* src/xterm.h (struct scroll_bar): Remove `x_drawable' field.

; Silence byte-compiler in two tests

* test/lisp/subr-tests.el (test-print-unreadable-function):
* test/src/print-tests.el (test-print-unreadable-function-buffer):
Pacify byte-compiler.

Delete redisplay-end-trigger-functions and related defuns

This variable and related functions have been obsolete since 23.1.
The last things to depend on this (fast-lock.el and lazy-lock.el) were
recently removed.

* src/dispextern.h (struct it): Delete field
'redisplay_end_trigger_charpos'.
* src/window.c (Fwindow_redisplay_end_trigger)
(Fset_window_redisplay_end_trigger): Delete defuns and corresponding
defsubrs for functions obsolete since 23.1.
* src/window.h (wset_redisplay_end_trigger): Delete function.
(GCALIGNED_STRUCT): Delete 'redisplay_end_trigger'.
* src/xdisp.c (run_redisplay_end_trigger_hook): Delete function.
(syms_of_xdisp) <redisplay_end_trigger_functions>: Delete
variable obsolete since 23.1.
(init_iterator, next_element_from_buffer): Don't run or set above
deleted hook variable.

* lisp/subr.el: Delete obsoletion definitions for above deleted
defuns and variable.
* doc/lispref/hooks.texi (Standard Hooks):
* lisp/emacs-lisp/byte-opt.el (side-effect-free-fns):
* lisp/loadhist.el (unload-feature-special-hooks): Don't mention
above deleted variable.
* admin/coccinelle/window.cocci: Adjust for above changes.

; * etc/NEWS: Minor edits.

Improve documentation of column-related functions

* doc/lispref/text.texi (Primitive Indent, Columns):
* src/indent.c (Fcurrent_indentation, Fmove_to_column): Document
that column counting ignores invisible text.  (Bug#56837)

; Fix warnings from #pragma GCC iagnostic pop on macOS

* src/comp.c: Add #pragma GCC diagnostic push in some places.

Fix native compiler handling of narrow-to-region

* lisp/emacs-lisp/comp.el (comp-limplify-lap-inst): Use auto for
byte-narrow-to-region.

Tweak icons.el emoji detection

* lisp/emacs-lisp/icons.el (icons--create): Choose another
character that's unlikely to appear in non-Emoji fonts.  (Comment
left in place since this should be fixed in a less breakable way.)

Make the symbol icons in outline.el more logical

* lisp/outline.el (outline-open, outline-close): Use symbols from
the same series so that it's more likely that they match up (bug#56823).

Make sure to preserve point across locked narrowing

* src/editfns.c (Fnarrow_to_region): Save the position of point
when locking the restriction, since this function can move point.

; * lisp/emacs-lisp/icons.el (icon-preference): repair type

Handle the optional argument of 'narrow-to-region' in byte-compiled code.

* lisp/emacs-lisp/bytecomp.el: Adapt the specifications.

* src/bytecode.c (exec_byte_code): Get the optional argument.

Clarify mail-header address parsing doc strings

* lisp/mail/mail-parse.el (mail-header-parse-address-lax):
* lisp/mail/ietf-drums.el (ietf-drums-parse-address): Clarify what
these functions do (bug#56824).

Fix outline-minor-mode-use-buttons defcustom type

* lisp/outline.el (outline-minor-mode-use-buttons): Fix wrong type.

buffer-match-p doc string clarification

* lisp/subr.el (buffer-match-p): Actually say that nil is a valid
value.

Adjust outline--use-buttons-p to buffer-match-p change

* lisp/outline.el (outline-minor-mode-use-buttons): Adjust doc string.
(outline--use-buttons-p): No longer any need to special-case t/nil.

Move a test from subr-tests to print-tests

* lisp/apropos.el (apropos-documentation): Simplify.

Avoid leaving temp buffers in bib-mode and refbib

* lisp/textmodes/bib-mode.el (bib-capitalize-title):
* lisp/textmodes/refbib.el (r2b-capitalize-title): Use
with-temp-buffer.

Prefer defvar-keymap in dns-mode-map

* lisp/textmodes/dns-mode.el (dns-mode-map): Prefer defvar-keymap.

Prefer defvar-keymap in nroff-mode-map

* lisp/textmodes/nroff-mode.el (nroff-mode-map): Prefer defvar-keymap.

Fix namespace use in bib-mode.el

* lisp/textmodes/bib-mode.el (bib-unread-file, bib-add)
(bib-return-key, bib-mark, bib-unread): Rename from
'unread-bib-file', 'addbib', 'return-key-bib', 'mark-bib', and
'unread-bib' respectively.  Maintain old names as obsolete aliases and
update uses.
(bib-mode-map): Prefer defvar-keymap.

; * lisp/emacs-lisp/regi.el: Delete incorrect "last modified" comment.

; * lisp/ffap.el: Comment cleanup.

Make ffap-newfile-prompt obsolete

* lisp/ffap.el (ffap-newfile-prompt): Obsolete in favor of
'find-file-not-found-functions'.

* lisp/ffap.el (ffap-url-regexp): Add gemini.

Make outline-view-change-hook obsolete

According to a comment, this hook "Seems only used by lazy-lock.
I.e. obsolete."  But lazy-lock has been deleted.
* lisp/outline.el (outline-view-change-hook): Make obsolete.

* src/macfont.m (macfont_open): Initialize font->space_width.  (Bug#56808)

Improve indexing of keymap variables

* doc/lispref/maps.texi (Standard Keymaps):
* doc/lispref/display.texi (Button Buffer Commands)
(Button Properties):
* doc/lispref/keymaps.texi (Translation Keymaps): Improve indexing
of keymaps.  (Bug#56816)

Merge from origin/emacs-28

e0f54c62ec CC Mode: fontify variables/functions after line comments e...
2c6a94c5b8 ; Correct the meaning of "cf." in tips.texi

Minor improvements to precision scroll interpolation

* lisp/pixel-scroll.el (pixel-scroll-start-momentum): Bump GC
cons threshold temporarily.  This leads to a very noticable
improvement to animation speed.

Fix failure caused by misreading the frame synchronization spec

* src/xterm.c (x_sync_update_begin): Ensure value % 4 is 1.
(x_sync_update_finish): Then, add 3.

Don't freeze if the compositing manager crashes

* src/xterm.c (x_if_event): New function, like XIfEvent but with
a timeout.
(x_sync_wait_for_frame_drawn_event): Disable frame
synchronization if x_if_event times out after 1 second.

CC Mode: fontify variables/functions after line comments ending in spaces

* lisp/progmodes/cc-engine.el (c-forward-comment-minus-1): Take account of
spaces preceding a linefeed when scanning a putative line comment end.

; * src/xdisp.c (handle_fontified_prop): Fix BOB case.

Improve narrowing when iterator has moved outside of narrowing bounds.

* src/xdisp.c (get_narrowed_begv, get_narrowed_zv): Add 'pos'
parameter.
(init_iterator): Add arguments to 'get_narrowed_begv' and
'get_narrowed_zv'.
(handle_fontified_prop): Recompute the narrowing when iterator
has moved outside of narrowing bounds.

* src/dispextern.h (get_narrowed_begv, get_narrowed_zv): Adapt
prototypes.

* src/composite.c (find_automatic_composition): Add argument
to 'get_narrowed_begv'.

; * buffers.texi (Buffer List): Mention t

* subr.el (buffer-match-p): Add t as trivial a condition