minibuffer.el: Try and fix bug#53053

* lisp/minibuffer.el (completion--sifn-requote): Special case for when
`upos` is at the very end.

; paren.el: fix comment speaking of an undefined variable

* lisp/progmodes/xref.el (xref--marker-ring): Fix typo

Make connection-local variables user options

* lisp/files-x.el (connection-local-profile-alist)
(connection-local-criteria-alist): Make them user options.

* doc/lispref/variables.texi (Connection Local Variables):
* etc/NEWS: Document this.

lisp-mnt, checkdoc: Reduce run-time dependencies

* lisp/emacs-lisp/lisp-mnt.el: Don't require `mail-parse` at top-level.
(lm-crack-address): Require it here instead.

* lisp/emacs-lisp/checkdoc.el (dired): Don't load at run-time.
(checkdoc-dired): Add corresponding `declare-function`.

Pin lazily read bytecode (bug#53809)

* src/eval.c (Ffetch_bytecode): Bytecode strings read lazily weren't
pinned as they must be.  Do so.

Bug reported by Gregor Zattler.

; * doc/emacs/xresources.texi (Table of Resources): Fix typo.

; Set show-paren--context-child-frame to nil after deleting it

Improve contrast of `custom-button' in the leuven-dark theme

* etc/themes/leuven-dark-theme.el (custom-button): Improve
contrast of custom-button foreground.

* lwlib/xlwmenu.c (pop_up_menu): Fix cast.

Correct off-by-one errors with frame resizing on Haiku

* src/haiku_support.cc (UnZoom):
(MakeFullscreen):
(BWindow_resize): Fix off-by-one errors in calls to
`BWindow::ResizeTo'.

Make menus work better on X toolkit builds with XInput 2

* src/xmenu.c (popup_get_selection): Translate some important
XI2 events into events the toolkit can understand.
(x_activate_menubar):
(create_and_show_popup_menu): Clear grab regardless of reported
status on Motif.
* src/xterm.c (xi_device_from_id): Export function.
* src/xterm.h: Update prototypes.

Sanitize ls switches in ange-ftp (bug#53360)

* lisp/net/ange-ftp.el (ls-lisp--sanitize-switches): Declare.
(ange-ftp-ls): Sanitize LSARGS.  (Bug#53360)

Improve indentation of some shell script forms

* lisp/progmodes/sh-script.el (sh-smie--default-backward-token):
Don't skip past things like "true;then" (bug#53817).

Really fix extended frame synchronization

* src/xterm.c (XTframe_up_to_date): Make sure the extended
counter ends up even.

; Fix previous commit (6e5d79c048)

Fix the Scroll key binding on Windows

* lisp/bindings.el (global-map): Fix the binding on Windows
(bug#38007).

* lisp/scroll-lock.el (scroll-lock-mode): The event is `scroll' on
Windows, not `Scroll_Lock'.

Make the eintr.html target match what's on the web

* doc/lispintro/Makefile.in (HTML_TARGETS, eintr.html): Make the
name match the URL at
https://www.gnu.org/software/emacs/manual/eintr.html (bug#38817).

Give a better error in locate-default-make-command-line

* lisp/locate.el (locate-default-make-command-line): Error out
more nicely.

Improve the ediff-diff-options documentation

* lisp/vc/ediff-diff.el (ediff-diff-options):
* doc/misc/ediff.texi (Patch and Diff Programs): Note that setting
this variable directly is probably the wrong thing to do (bug#6512).

Respect `x-cursor-fore-pixel' on Haiku

* src/haikufns.c (haiku_set_cursor_color): Respect
`x-cursor-fore-pixel'.
(syms_of_haikufns): Declare variable `x-cursor-fore-pixel'.

Clean up more code from PGTK port

* lisp/term/pgtk-win.el (pgtk-disown-selection-internal)
(pgtk-get-selection-internal): Fix declarations for new calling
conventions.
* src/gtkutil.c (xg_frame_set_char_size, x_wm_set_size_hint):
Clean up meaningless variables on PGTK.
* src/pgtkfns.c (Fx_create_frame, syms_of_pgtkfns): Clean up
meaningless variables and fix copied doc strings to use "skip".
* src/pgtkim.c (im_context_commit_cb)
(im_context_retrieve_surrounding_cb)
(im_context_delete_surrounding_cb, make_color_string)
(im_context_preedit_changed_cb, im_context_preedit_end_cb)
(im_context_preedit_start_cb): Fix coding style.
* src/pgtkselect.c (pgtk_selection_usable)
(Fpgtk_disown_selection_internal, Fpgtk_get_selection_internal):
Remove unused arguments.
(syms_of_pgtkselect): Fix doc strings and old style variable
declarations.
* src/pgtkterm.c (x_set_offset, x_set_parent_frame)
(syms_of_pgtkterm): Clean up doc strings and remove meaningless
variables.

* doc/emacs/xresources.texi (Table of Resources): Improve wording.

Correct implementation of extended frame synchronization

* src/xterm.c (handle_one_xevent): Use value provided in the
extended synchronization message as the current counter value.

Make dired-directory and dired-subdir-alist buffer-local

* lisp/dired.el (dired-directory):
(dired-subdir-alist): Make buffer-local (bug#7118)
(dired-readin):
(dired-mode):
* lisp/dired-x.el (dired-virtual): Adjust usage.
* lisp/locate.el (locate-mode):
* lisp/find-lisp.el (find-lisp-find-dired-internal):
* lisp/find-dired.el (find-dired): Adjust usage.

Fix eval-tests/backtrace-in-batch-mode test

* lisp/emacs-lisp/debug-early.el (debug-early-backtrace): Fix the
zero-arg case.

Make async connect_network_socket failures use Qfailed

* src/process.c (connect_network_socket): Mark the process as
Qfailed instead of using the error symbol (since this is what's
defined for the status) (bug#53814).

Remove outdated comments from ietf-drums.el

* lisp/mail/ietf-drums.el: Remove outdated comments (bug#53811).

ansi-color: don't get stuck on \e

* lisp/ansi-color.el (ansi-color--control-seq-fragment-regexp): New
constant.

* test/lisp/ansi-color-tests.el
(ansi-color-incomplete-sequences-test): Test for \e that doesn't
start a valid ANSI escape sequence (bug#53808).

Code amended (and test code written) by <miha@kamnitnik.top>.  Code by
Ioannis Kappas is small enough to be

Copyright-paperwork-exempt: yes

(debug-early-backtrace): Tweak the non-evald output

* lisp/emacs-lisp/debug-early.el (debug-early-backtrace): Make the
non-evald output more like what is used in `debug.el`.

(debug-early-backtrace): Tweak the non-evald output

* lisp/emacs-lisp/debug-early.el (debug-early-backtrace): Make the
non-evald output more like what is used in `debug.el`.

Use mode-line-window-selected-p in tab-line-tab-name-format-default.

* lisp/tab-line.el (tab-line-tab-name-format-default):
Use the recently added function 'mode-line-window-selected-p'
for the face 'tab-line-tab-current' (bug#53629).

* lisp/tab-bar.el (tab-bar-new-tab-choice): Add const 'window'.  Update doc.

(tab-bar-new-tab-to): Remove window parameters 'window-side' and
'window-atom' from the old window.  Move split-window/delete-window
inside ignore-window-parameters (bug#53662).

Adapt em-tramp-tests.el

* test/lisp/eshell/em-tramp-tests.el (tramp): Require.
(em-tramp-test/su-default, em-tramp-test/su-user)
(em-tramp-test/su-login, em-tramp-test/sudo-basic)
(em-tramp-test/sudo-user): Adapt tests.

Avoid deprecation warning in NS-specific code

* src/macfont.m (mac_font_create_preferred_family_for_attributes):
CTGetCoreTextVersion is obsolete and its use elicits a warning
in macOS 11.6; use NSProcessInfo instead.

; * src/alloc.c (mark_memory): Fix outdated comment.

Ensure bar cursors are always visible on Haiku

* src/haikuterm.c (haiku_draw_window_cursor): Adjust bar cursor
colors like X.

Fix the GTK 2 build

* src/gtkutil.c (xg_filter_key): Remove call to GTK3-only
function without GTK 3.
* src/xfns.c (select_visual): Avoid 32-bit visuals on GTK 2.

Disable extended frame synchronization by default

* doc/emacs/xresources.texi (Table of Resources): Document
new possible value of `synchronizeResize'.
* src/xfns.c (Fx_create_frame): Set synchronization protocol
according to `synchronizeResize'.

Add support for EWMH extended frame synchronization

* src/xfns.c (Fx_create_frame): Populate both counter variables.
* src/xterm.c (XTframe_up_to_date):
(handle_one_xevent): Support extended synchronization.
(x_free_frame_resources): Destroy extended counter.
(x_term_init): Intern new atom _NET_WM_FRAME_DRAWN.

* src/xterm.h (struct x_display_info): New atom
`_NET_WM_FRAME_DRAWN'.
(struct x_output): New fields for extended counter tracking.
(FRAME_X_EXTENDED_COUNTER): New macro.

; * etc/NEWS: Fix entry for 'find-library-include-other-files'.

Fix infloop in 'redisplay_window' when buffer is narrowed

* src/xdisp.c (redisplay_window): Ensure window-start point is in
the accessible portion of the buffer when passing it to
'window_start_acceptable_p'.  (Bug#14582)

Display show-paren-context-when-offscreen in child frame

* etc/NEWS: Extend section about the new
`show-paren-context-when-offscreen' custom option.
* lisp/paren.el (show-paren-context-when-offscreen): Allow special
value `child-frame'.
(show-paren-function): Handle `child-frame' value of
`show-paren-context-when-offscreen'.
(show-paren--context-child-frame): New defvar.
(show-paren--context-child-frame-redirect-focus): New function.
(show-paren--context-child-frame-buffer): New function.
(show-paren--context-child-frame-parameters): New defvar.
(show-paren--delete-context-child-frame): New function.
(show-paren--show-context-in-child-frame): New function.

Make usage of su and sudo consistent in eshell (bug#53783)

* lisp/eshell/em-tramp.el (eshell/su, eshell/sudo):
Use `tramp-default-host' instead of "localhost".

Merge from origin/emacs-28

821c240075 Fix ietf-drums-get-comment doc string
638247baa4 Fix typo in display.texi

* lwlib/xlwmenu.c (pop_up_menu): Work around motion problems on XI2.

; * src/xfns.c (x_encode_text): Fix comment.

Add ietf-drums tests, fix parse-address decoding

* test/lisp/mail/ietf-drums-tests.el (ietf-drums-tests):  Test most of
lisp/mail/ietf-drums.el functionality.
* lisp/mail/ietf-drums.el: (ietf-drums-parse-address): Bug fix:
Require rfc2047 when needed (bug#53811).

Allow disabling frame resize synchronization

* doc/emacs/xresources.texi (Table of Resources): Document new
parameter `synchronizeResize'.
* etc/NEWS: Announce frame resize synchronization.
* src/xterm.c (x_term_init): Don't enable XSync if the
X resource `synchronizeResize' is off or false.

Clean up lots of #ifdef'd out code in PGTK files

Most of them are either relics from X or from the NS code
pgtkfns.c was copied from whole.

* src/pgtkfns.c (x_icon):
(pgtk_set_scroll_bar_foreground):
(pgtk_set_scroll_bar_background):
(Fx_create_frame):
(pgtk_window_is_ancestor):
(x_create_tip_frame):
* src/pgtkselect.c (syms_of_pgtkselect):
* src/pgtkterm.c (pgtk_iconify_frame):
(x_set_frame_alpha):
(button_event): Remove defined out code that cannot make sense.

* src/pgtkmenu.c (show_help_event): Remove ifdef'd out code and
reword comment.

Handle window state changes on PGTK

* src/pgtkterm.c (window_state_event): Set fullscreen, sticky,
and iconification status according to the new window state.
(bug#53793)

Minor changes to xsync support

* src/xfns.c (append_wm_protocols): Don't append
_NET_WM_SYNC_REQUEST unless the display supports our version of
XSync.

* src/xterm.c (handle_one_xevent): Don't handle
_NET_WM_SYNC_REQUEST unless the display supports that.
(x_free_frame_resources): Test basic counter against None.

Fix ietf-drums-get-comment doc string

* lisp/mail/ietf-drums.el (ietf-drums-get-comment):  We really return
the last comment (bug#53810).

Improve the elp-instrument-package doc string

* lisp/emacs-lisp/elp.el (elp-instrument-package): Note the effect
of loading further files (bug#13252).

Fix reverting the default face to standard/themed state in GUIs

* lisp/cus-edit.el (custom-face-set, custom-face-mark-to-save)
(custom-face-save): Record the default (standard or themed) attributes
of the default face in a symbol property.
(custom-face-reset-saved, custom-face-mark-to-reset-standard): When
reverting the default face to the standard or themed state, use the
default attributes we recorded, instead of relying in the defface spec
of the default face, since that doesn't give enough information to
reset all attributes, like foreground, family, etc (bug#14635).

Add new user option 'find-library-include-other-files'

* lisp/emacs-lisp/find-func.el (read-library-name--find-files):
New function (bug#15735).
(read-library-name): Use it.
(find-library-include-other-files): New user option.

Tweak how eshell/cd works when cd-ing to ".." from "/"

* lisp/eshell/em-dirs.el (eshell/cd): Make "cd .." from "/" less
confusing (bug#16861).

Add a :distant-foreground to the lazy-highlight face

* lisp/isearch.el (lazy-highlight): Add a :distant-foreground
colour so that the text is always legible (bug#16969).

Add new function mode-line-window-selected-p

* doc/lispref/modes.texi (Mode Line Basics): Mention it (bug#53629).
* lisp/bindings.el (mode-line-window-selected-p): New function
from martin rudalics <rudalics@gmx.at>.

Fix typo in display.texi

* doc/lispref/display.texi (Making Buttons): Fix typo.  (Bug#53807)

Adapt Tramp to changed unload behavior (bug#53632)

* test/lisp/net/tramp-tests.el (tramp-test47-unload): Check also
for autoloaded macros.  Respect `tramp-autoload' function property.

Add support for basic syncing with the window manager on resize

This is handled by GTK 3, so the code is disabled on that
specific build.  On other builds, this eliminates any unexposed
part of a frame from showing up after a resize when
`frame-resize-pixelwise' is t.

* configure.ac: Check for the X Synchronization Extension if
present.
* src/Makefile.in (EMACS_CFLAGS):
(LIBES): Add XSYNC_LIBS and XSYNC_CFLAGS.

* src/xfns.c (append_wm_protocols): Declare
`_NET_WM_SYNC_REQUEST' support if appropriate.
(x_window): Adjust location of call to `append_wm_protocols' on
Xt version to prevent it from being overwritten.
(Fx_create_frame): Create basic counter.
* src/xterm.c (XTframe_up_to_date): Set counter value to the one
asked for by the window manager.
(handle_one_xevent): Handle _NET_WM_SYNC_REQUEST.
(x_free_frame_resources): Free frame counter if present.
(x_term_init): Test for XSync and set fields accordingly.
* src/xterm.h (struct x_display_info): New fields for XSync
support and new atoms.
(struct x_output): New fields for counter status.
(FRAME_X_BASIC_COUNTER): New macro.

* lisp/pixel-scroll.el: Update commentary.

Fix 'current-column' in the presence of display strings

* src/indent.c (check_display_width): Support calculation of width
of 'display' properties whose values are strings.  This fixes the
value returned by 'current-column' when display strings are
present between BOL and point.  (Bug#53795)

* lisp/emacs-lisp/debug-early.el: Improve the documentation

Remove superfluous `font-lock-add-keywords' calls in Tramp

* lisp/net/tramp.el (with-parsed-tramp-file-name)
(with-tramp-progress-reporter, with-tramp-file-property)
(with-tramp-connection-property, with-tramp-locked-connection):
* lisp/net/tramp-gvfs.el (with-tramp-dbus-call-method)
(with-tramp-dbus-get-all-properties): Do not call
`font-lock-add-keywords' for macros, it isn't needed anymore.

Adapt Tramp to changed unload behavior (bug#53632)

* lisp/net/tramp.el (tramp-autoload-file-name-handler)
(tramp-register-autoload-file-name-handlers)
(tramp-unload-file-name-handlers, tramp-unload-tramp):
* lisp/net/tramp-archive.el (tramp-archive-autoload-file-name-regexp)
(tramp-archive-autoload-file-name-handler)
(tramp-register-archive-file-name-handler):
Add `tramp-autoload' function property.

Fix yank-media utf-16 detection

* lisp/yank-media.el (yank-media--utf-16-p): Factor out into its
own function for easier testing and fix the code.

Improve the selected-window doc string

* src/window.c (Fselected_window): Add some pointers to other
functions in this area.

Ensure that the CAR of 'eshell-last-async-procs' always points to a process

Previously, if a non-process was piped to a process, this could end up
being nil, which isn't correct.  'eshell-last-async-procs' should just
ignore non-process commands in a pipeline.

* lisp/eshell/esh-cmd.el (eshell-do-pipelines): Set 'headproc'
correctly.

* test/lisp/eshell/eshell-tests.el (eshell-test/pipe-headproc): New test.

Remove kerning escapes in woman mode

* lisp/woman.el (woman-decode-region): Remove kerning escapes
(bug#53770).

Copyright-paperwork-exempt: yes

Improve the Archive file names tramp documentation

* doc/misc/tramp.texi (Archive file names): Explicitly say how to
open an archive with Tramp (bug#25076).

Fix yank-media-types--format decoding

* lisp/yank-media.el (yank-media-types--format): Check that we
really have some nuls.

Finish up cursor color merging on Haiku

* src/haikuterm.c (haiku_draw_text_decoration):
(haiku_draw_plain_background):
(haiku_draw_stretch_glyph_string):
(haiku_merge_cursor_foreground): Use merged cursor colors.

Fix last change to ftcrfont.c

* src/ftcrfont.c (ftcrfont_draw): Remove relic `face' variable
and use s->face instead.

Implement face cursor color merging on Haiku

* src/ftcrfont.c (ftcrfont_draw):
* src/haikufont.c (haikufont_draw): Use
`haiku_merge_cursor_foreground' to calculate cursor HL colors.
* src/haikuterm.c (haiku_merge_cursor_foreground): New function.
* src/haikuterm.h: Update prototypes.

Set WM_TRANSIENT_FOR on tooltip frames

Otherwise the decorations get all messed up on GNOME and some
other composited desktops.

* src/xfns.c (Fx_show_tip): Set WM_TRANSIENT_FOR to the window
underneath the tooltip.

Implement _NET_WM_PING protocol

* src/xfns.c (append_wm_protocols): New function.
(x_window): Call `append_wm_protocols' after window creation.
* src/xterm.c (handle_one_xevent): Handle _NET_WM_PING client
messages.
(x_term_init): Intern _NET_WM_PING atom.
* src/xterm.h (struct x_display_info): New field
`Xatom_net_wm_ping'.

Update the MULTIPLE property with conversion outcomes

Per the ICCCM spec:

> If the owner fails to convert the target named by an atom in the
> MULTIPLE property, it should replace that atom in the property with
> None.

* src/xselect.c (x_handle_selection_request): Do it.

Do not delete the MULTIPLE property after reading it

Per the ICCCM spec:

> The requestor should delete [...] the property specified in the
> MULTIPLE request when it has copied all the data.

We are not the requestor, so we should not be deleting this property
(which is what x_get_window_property_as_lisp_data does).  The property
needs to remain available as the requestor will generally want to read
it back to see which conversions succeeded or not.

* src/xselect.c (x_get_window_property_as_lisp_data): Add flag which
skips deleting the read property, or handling INCR (which does not
make sense for MULTIPLE).
(x_handle_selection_request): Enable the flag.

(with-demoted-errors): Warn on missing `format` arg

The `format` arg has been mandatory for a while, but the backward
compatibility code that handled the case of a missing `format` arg
made it hard to notice when using the old calling convention.

* lisp/subr.el (with-demoted-errors): Warn on missing `format` arg.

* lisp/emacs-lisp/smie.el (smie-indent--separator-outdent): Don't abuse
`with-demoted-errors`.
(smie-indent-line, smie-auto-fill):
* test/lisp/emacs-lisp/ert-tests.el (ert-test-with-demoted-errors):
* lisp/vc/vc-hooks.el (vc-refresh-state):
* lisp/vc/vc-annotate.el (vc-annotate-background-mode):
* lisp/vc/diff-mode.el (diff-syntax-fontify-hunk):
* lisp/textmodes/reftex-toc.el (reftex-re-enlarge):
* lisp/progmodes/sh-script.el (sh-smie-sh-rules):
* lisp/progmodes/octave.el (inferior-octave-startup):
* lisp/pcmpl-gnu.el (pcmpl-gnu-make-all-targets):
* lisp/org/org-refile.el (org-refile):
* lisp/org/org-capture.el (org-capture-store-last-position):
* lisp/nxml/nxml-mode.el (nxml-mode):
* lisp/notifications.el (notifications-notify):
* lisp/gnus/mm-view.el (mm-display-inline-fontify):
* lisp/finder.el (finder-unload-function):
* lisp/files.el (safe-local-variable-p, backup-buffer-copy
* lisp/autorevert.el (auto-revert-notify-handler):
Pass `format` arg to `with-demoted-errors`.

python.el: Silence left over warning in last commit

* lisp/progmodes/python.el
(python-shell-calculate-process-environment): Declare
tramp-remote-process-environment before using it.

python.el: Try and better split the Tramp code

Massage the Python-Tramp code so that the Tramp part and the Python
part are a bit less intertwined.  It's still not quite right, but it's
a bit closer to the point where the Tramp part can be moved to `tramp.el`.

* lisp/progmodes/python.el: Don't require `tramp-sh`.
Do require `subr-x` OTOH.  Remove redundant `:group`s.
(python-shell--calculate-process-environment): New function, that only
return the entries to be added.
(python-shell-calculate-process-environment): Rewrite and declare obsolete.
(python-shell-tramp-refresh-remote-path)
(python-shell-tramp-refresh-process-environment): Silence
compiler warnings.
(python-shell-with-environment): Move the bulk of its code to
a new function `python-shell--with-environment` for easier debugging
and to avoid code duplication.
(python-shell--with-environment): New function.  Split the Tramp case
into its own function.
(python-shell--tramp-with-environment): New function.
(python-eldoc-function-timeout-permanent): Fix doc's first line.

* test/lisp/progmodes/python-tests.el: Adjust accordingly.
(python-shell-calculate-process-environment-1)
(python-shell-calculate-process-environment-2)
(python-shell-calculate-process-environment-3)
(python-shell-calculate-process-environment-4)
(python-shell-calculate-process-environment-5)
(python-shell-calculate-process-environment-6)
(python-shell-calculate-process-environment-7)
(python-shell-calculate-process-environment-8):
Use `python-shell--calculate-process-environment`.
(python--tests-process-env-canonical, python--tests-process-env-eql):
New functions.
(python-shell-with-environment-2, python-shell-with-environment-3):
Use them.

Improve Tramp tests backward compatibility

* test/lisp/net/tramp-tests.el (tramp-test39-detect-external-change):
Improve backward compatibility.

* Have `null' and `not' explicit in LIMPLE so we inline them

* lisp/emacs-lisp/comp.el (comp-limplify-lap-inst): Generate explicit
`eq' call in LIMPLE for LAP opcode 'not'.

Fix infloop in redisplay_window due to fix of bug#14582

* src/xdisp.c (window_start_acceptable_p): New function.
(redisplay_window): Call 'window_start_acceptable_p' to determine
whether a given window-start point is acceptable, including when
the window's force_start flag is set -- this fixes infloop in
redisplay_window in that case.

Remove misleading "in current buffer" message from auto-raise-mode

* lisp/frame.el (auto-raise-mode): Declare as global to prevent
a misleading message from being displayed.  It's actually
frame-local, but declaring it global doesn't hurt since
`frame-parameter' is a gv.

Silence byte-compiler in two tests

* test/lisp/electric-tests.el (electric-pair-define-test-form):
* test/src/buffer-tests.el (buffer-tests--make-test-name): Silence
byte-compiler by defining defuns also at run time.

; * src/haikuterm.c (haiku_end_cr_clip): Fix trivial typo.

Implement auto-raise on Haiku

* src/haikuterm.c (haiku_read_socket): Implement auto-raising
of frames that have that parameter set.

* lisp/net/tramp-gvfs.el (tramp-gvfs-send-command): Fix problem with locale.

; * src/xterm.c (x_alloc_nearest_color_1): Remove extraneous code.

Fix bit rot in the color allocation code

* src/xterm.c (x_alloc_nearest_color_1): Reintroduce an older
version of the code that would try to allocate a "compromise
delta".

* src/xwidget.c (xwidget_button): Always let button events through.

Filtering out emulated events is done in handle_one_xevent, so
all this accomplishes is to filter out legitimate button events.

Merge from origin/emacs-28

0591aa6cd3 Revert an erroneous change in tramp-cache.el

Fix toggling `x-gtk-use-native-input'.

* lisp/term/x-win.el (x-internal-focus-input-context):
(x-gtk-use-native-input-watcher): Update for changes to
`x-internal-focus-input-context'.

* src/xfns.c (Fx_internal_focus_input_context): New parameter
`focus'.

Make Emacs build with some other XLib implementations

* configure.ac (HAVE_XKB): Check for functions that aren't
always implemented by various XLib implementations.

* src/xfns.c (select_visual): Handle NULL values of vinfo.
(XkbRefreshKeyboardMapping):
(XkbFreeNames):
(XDisplayCells):
(XDestroySubwindows): Define replacement functions where they
aren't available.

* src/xterm.c (x_find_modifier_meanings): Handle NULL values of
various fields.

* src/xfns.c (Fx_internal_focus_input_context): Fix typo.

Make `x-gtk-use-native-input' take effect immediately

* lisp/term/x-win.el (x-internal-focus-input-context): New
declaration.
(x-gtk-use-native-input-watcher): New variable watcher.
* src/xfns.c (Fx_internal_focus_input_context): New function.
(syms_of_xfns): Define new subr.

Try to fix input method flicker on GTK builds

* src/xterm.c (x_focus_changed): Only focus GTK context if
native input is on.  (bug#53698)