Handle hierarchy events for updating scroll valuators correctly

* src/keyboard.c (gen_help_event, kbd_buffer_store_help_event):
Make sure to initialize the event buffer correctly.

* src/xterm.c (xi_populate_device_from_info): New function.
(x_init_master_valuators): Factor out most of the valuator
tracking code to that function.
(handle_one_xevent): Handle device enable and disable events in
a more detailed fashion.

Fix DND leave events not being sent to toplevel after returning frame

* src/xterm.c (x_dnd_update_state, handle_one_xevent): Make sure
to send leave events to the previous toplevel when cancelling to
return a frame.

Use right frame when computing mouse movement device

* src/keyboard.c (kbd_buffer_get_event): Use the frame on which
the mouse actually moved to compute the last mouse device.

Minor cleanups in X Windows drag-and-drop code

* src/keyboard.c (kbd_buffer_get_event): Don't dereference f if
nil when generating mouse motion event.
* src/xterm.c (x_dnd_send_enter, x_dnd_send_position)
(x_dnd_send_leave, x_dnd_send_drop, x_send_scroll_bar_event):
Use NoEventMask instead of 0.

Fix source reporting for focus in and focus out events

* src/xterm.c (handle_one_xevent): Report source name for
FocusIn and FocusOut events.

Clean up XI2 scroll valuator tracking code

* src/xterm.c (x_get_scroll_valuator_delta): Accept a pointer to
a device instead of the device id.
(handle_one_xevent): Pass the previously found device.

* src/pgtkterm.c (pgtk_set_cr_source_with_color): Fix default operator.

Fix subpixel AA with alpha-background on Cairo on X

* xterm.c (x_set_cr_source_with_gc_foreground)
(x_set_cr_source_with_gc_background): Set operator back to OVER
if alpha-background isn't to be respected.

Update from Gnulib by running admin/merge-gnulib

Pacify clang -Wunused-variable

* src/coding.c (detect_coding_utf_8):
* src/process.c (Finternal_default_process_filter):
Remove unused local vars.

ebrowse dumping need not return int

* lib-src/ebrowse.c (dump_members, dump_tree): Return void, not
int, since callers never actually use returned value.  All uses
changed.

Fix scrollbars on macOS 10.13 and below (bug#54623)

Make any build on macOS 10.13 and below follow the same drawing path
as the GNUstep port.  macOS 10.14 and above will use EmacsLayer.

* src/nsterm.h (EmacsLayer):
* src/nsterm.m ([EmacsView makeBackingLayer]):
([EmacsView unlockFocus]):
([EmacsView windowDidChangeBackingProperties:]):
([EmacsView copyRect:to:]): Remove any code required for macOS 10.13
and below, and fix the #if's to enforce strict separation of the
drawing paths.
(ns_update_end):
(ns_unfocus): Fix #ifs so that flushWindow is called on old macOS
versions as well as GNUstep.

Fix pacifying gcc -Wanalyzer-null-dereference

* src/xterm.c (handle_one_xevent): Use eassume not eassert.
eassert (X)’s suppress_checking does not let GCC assume X.

Rename mark_stack to mark_c_stack

This is the function that marks the C stack.  Avoid confusion with the
new mark stack, a stack used in the GC mark phase.

* src/alloc.c (SETJMP_WILL_LIKELY_WORK, SETJMP_WILL_NOT_WORK)
(mark_stack, mark_c_stack):
* src/lisp.h:
* src/thread.c (mark_one_thread): Rename mark_stack to mark_c_stack.

Enable warnings when building as a developer with Clang

The configure-script logic that automatically enables warnings when
building in a development tree didn't work for Clang because it was
identified as an old GCC version.

* configure.ac: Don't test Clang version as if it were GCC.

Improve package.el error messages on too-old Emacsen

* lisp/emacs-lisp/package.el (package-compute-transaction): Give a
better error message on too-old Emacs versions (bug#54747).

Recommend that the user turn off memory overcommit

* doc/emacs/trouble.texi (Memory Full): Tell the user that Emacs
behaves best with overcommit off, and how to turn it off.

; * src/nsterm.m: Remove stray semicolon

Interpolate scrolls coming from mice by default

* lisp/pixel-scroll.el
(pixel-scroll-precision-interpolate-mice): New
user option.
(pixel-scroll-precision): If the class of the last event device
is `mouse', interpolate the next scroll.

Ensure local `default-directory' when calling `process-attributes'.

* lisp/server.el (server-running-p):
* lisp/subr.el (memory-limit): Ensure local `default-directory'
when calling `process-attributes'.

Fix GC marking of input events with devices

* src/keyboard.c (mark_kboards):
* src/pgtkterm.c (mark_pgtkterm): Mark `device' as well.

Implement support for reporting device names on PGTK

* lisp/frame.el (device-class): Add new function.
* lisp/term/pgtk-win.el (pgtk-device-class): New function.
* src/pgtkterm.c (pgtk_device_added_or_removal_cb)
(pgtk_seat_added_cb, pgtk_seat_removed_cb)
(pgtk_enumerate_devices)
(pgtk_free_devices, pgtk_regenerate_devices)
(pgtk_get_device_for_event): New functions.
(mark_pgtkterm): Mark device data.
(pgtk_delete_terminal): Delete device data.
(pgtk_handle_event, key_press_event, note_mouse_movement)
(construct_mouse_click, button_event, scroll_event)
(drag_data_received): Set device correctly.
(pgtk_term_init): Initialize device data and seat tracking.
(pgtk_delete_display): Delete device data.
* src/pgtkterm.h (struct pgtk_device_t): New struct.
(struct pgtk_display_info): New field `devices'.  Delete lots of
unused macros and reformat comments.

* lisp/term/x-win.el (x-device-class): Detect more keyboards.

; * src/emacs.c (main): Reword & reflow description of PGTK problem.

Ignore input extension errors caused by grabbing

* src/xterm.c (x_error_handler): Ignore GrabDevice and
UngrabDevice errors.

* lisp/term/x-win.el (x-device-class): Detect "USB USB Keykoard"s.

Add code for determining the type of an input device

* doc/lispref/commands.texi (Command Loop Info):
* etc/NEWS: Update documentation and announce `device-class'.

* lisp/frame.el (x-device-class):
(device-class):
* lisp/term/x-win.el (x-device-class): New functions.

Fix reporting of last-event-device for synthetic events

* src/keyboard.c (read_char): Clear `last-event-device' earlier.

Make device reporting work for tool bar clicks

* src/dispextern.h: Update prototyupes.
* src/xdisp.c (handle_tool_bar_click): Pass Qt to that function
instead.
(handle_tool_bar_click_with_device): New function.
* src/xterm.c (handle_one_xevent): Pass device to tool bar click
logic.

* src/xterm.c (handle_one_xevent): Fix build warning on non-GTK builds.

lisp/simple.el: Use #' in new code

* lisp/simple.el (minibuffer-local-shell-command-map): Use #' to quote
function names.

Display file mode information when diff font lock prettify enabled

* lisp/vc/diff-mode.el (diff--font-lock-prettify): Make regexp capture
file mode information.

OClosure: New function `function-documentation`

As mentioned in the original OClosure commit, OClosures (ab)use the
bytecode's docstring slot to hold the OClosure's type.  This currently
prevents OClosures from having their own docstring.

Introduce a new generic function `function-documentation` to fetch the
docstring of a function, which can then be implemented in various
different ways depending on the OClosure's type.

* lisp/simple.el (function-documentation): New generic function.
(bad-package-check): Strength-reduce `eval` to `symbol-value`.
* src/doc.c (Fdocumentation): Use it.

* lisp/emacs-lisp/oclosure.el (oclosure--accessor-docstring): New function.
* test/lisp/emacs-lisp/oclosure-tests.el (oclosure-test):
Add test for accessor's docstrings.

Expose the name of an event's input device to Lisp

This name can be used to identify the device for special
treatment, i.e. only interpolating scrolls coming from mice and
not touchpads inside pixel-scroll-precision-mode.

* doc/lispref/commands.texi (Command Loop Info): Document new
variable `last-event-device'.
* etc/NEWS: Announce new variable `last-event-device'.
* src/frame.h (struct frame): New field `last_mouse_device'.
* src/keyboard.c (read_char): Clear last-event-device.
(kbd_buffer_get_event): Set last-event-device to the event's
recorded device.
(init_keyboard): Clear last-event-device.
(syms_of_keyboard): New defvar `last-event-device'.
* src/termhooks.h (struct input_event): New field `device'.
(EVENT_INIT): Set it to the special value `Qt' by default.
* src/xterm.c (x_init_master_valuators): Record the device's
name.
(x_dnd_begin_drag_and_drop): Only preserve last event device if
the mouse ended up in the source frame.
(x_note_mouse_movement): New argument `source'.
(handle_one_xevent): Set input event sources whenever
appropriate.
(mark_xterm): Mark device names.

* src/xterm.h (struct xi_device_t): New field `name'.

Fix xwidget smooth scrolling when the default pointer is not a touchpad

* xwidget.c (find_suitable_pointer): New argument
`need_smooth'.  Try to find a touchpad if that is set.
(xwidget_button_1, xwidget_button, xwidget_motion_notify)
(xwidget_scroll, xwidget_pinch, xw_notify_virtual_upwards_until)
(xw_notify_virtual_downwards_until):
(xw_maybe_synthesize_crossing):
(xwidget_motion_or_crossing, synthesize_focus_in_event): Set
parameter accordingly.

Clarify read-answer-short/use-short-answers action

* lisp/emacs-lisp/map-ynp.el (read-answer-short): Clarify what
this variable affects (bug#54754).

* src/fns.c (Fyes_or_no_p): Mention `use-short-answers'.

Encrypt some parameters in auth-source plstore backend

The auth-source plstore backend allows a list of extra parameters but
currently stores them all unencrypted.  This allows a plist with
:unencrypted and :encrypted keys to specify which extra parameters to
encrypt in the plstore file.

* lisp/auth-source.el (auth-source-plstore-create): Allow specifying
both unencrypted and encrypted extra parameters.

Add a mu backend for gnus-search

* lisp/gnus-search.el (gnus-search-mu-program): New defcustom
(gnus-search-mu-switches): New defcustom
(gnus-search-mu-remove-prefix): New defcustom
(gnus-search-mu-config-directory): New defcustom
(gnus-search-mu-raw-queries-p): New defcustom
(gnus-search-mu): New subclass of gnus-search-indexed
(gnus-search-transform-expression): New method
(gnus-search-mu-handle-date): New function
(gnus-search-mu-handle-flag): New function
(gnus-search-indexed-extract): New method
(gnus-search-indexed-search-command): New method (bug#54662).

* lisp/net/tramp-integration.el: Don't require files-x.

Fix error when calling DND movement tracking function

* src/xterm.c (x_dnd_begin_drag_and_drop): Verify
x_dnd_movement_x and x_dnd_movement_y are wholenums before
caling posn-at-x-y.

* src/xterm.c (xm_write_targets_table): Remove extra XGrabServer pair.

Fix DND bugs on GTK

* src/xterm.c (handle_one_xevent): Don't let some client
messages reach the toolkit.

Remove more code mindlessly copied from NS

* src/pgtkfns.c (Fx_open_connection):
* src/pgtkselect.c (nxatoms_of_pgtkselect):
* src/pgtkselect.h:
* src/pgtkterm.h: Delete `nxatoms_of_pgtkselect'.

; * etc/PROBLEMS: Explain how to get dropping text on xterm to work.

Fix sending unsupported drops when there is no target but a toplevel

* src/xterm.c (handle_one_xevent): Send unsupported drops to
last seen toplevel if no target was found.

Improve doc of x-begin-drag

* doc/lispref/frames.texi (Drag and Drop): Fix typos and clarify
meaning of XdndActionPrivate.

Return an appropriate action when performing unsupported drop

* src/xterm.c (x_dnd_send_unsupported_drop): Set action to
XdndActionPrivate.

* src/xselect.c (x_atom_to_symbol): Add XdndSelection.

Fix ses-tests.el

* lisp/ses.el (ses-jump-cell-name-function): Docstring typo.

* test/lisp/ses-tests.el (ses--cells, foo, bar, B2, toto): Do not
do any outer defvar, but set the defvar only under the
with-suppressed-warnings directive to silence the byte-compiler.

* lisp/ses.el: Fix 80-column-docstring warnings

Also remove redundant `:group` args and prefer #' to quote function names.

Get rid of extra sync looking up window through XTranslateCoordinates

* src/xterm.c (x_dnd_get_wm_state_and_proto): Return proxy as
well.
(x_dnd_get_target_window): Use that proxy.

Move some X11 drag and drop processing to Lisp

* lisp/term/x-win.el: Set unsupported drop function.
* lisp/x-dnd.el (x-dnd-handle-unsupported-drop): New function.
* src/keyboard.c (kbd_buffer_get_event): Handle
UNSUPPORTED_DROP_EVENT.
* src/termhooks.h (enum event_kind): New event
`UNSUPPORTED_DROP_EVENT'.
* src/xterm.c (x_dnd_send_unsupported_drop): Send those events
instead.
(x_dnd_do_unsupported_drop): Move actual unsupported drop
handling here.
(syms_of_xterm): New variable `x-dnd-unsupported-drop-function'.
* src/xterm.h: Update prototypes.

Fix minor-mode doc string quoting

* lisp/emacs-lisp/easy-mmode.el (easy-mmode--mode-docstring): Fix
double quoting of things like (default-value 'electric-pair-mode)
(bug#54746).

Make the Foot terminal an alias of xterm-256color

* lisp/faces.el (term-file-aliases): Make the foot terminal an alias
of xterm-256color (bug#54739).

Make file-name-split returns driver name as well in Windows

* lisp/files.el (file-name-split): Returns driver name as well in
Windows.
* lisp/net/browse-url.el (browse-url-file-url): Don't hexify colon
character in file path for Windows (bug#54721).

Add .bashrc detection to sh-mode

* lisp/progmodes/sh-script.el (sh-mode): Add .bashrc string-match
(bug#54727).

Use CUA functions to scroll pages with pixel-scroll-scroll-mode

* lisp/pixel-scroll.el (pixel-scroll-interpolate-down)
(pixel-scroll-interpolate-up): Use `cua-scroll-up' and
`cua-scroll-down' to scroll if
`pixel-scroll-precision-interpolate-page' is off.  (bug#54696)

Prevent races when trying to set Motif drag window

* src/xterm.c (xm_get_drag_window): Grab temp connection when
setting the drag window.

Revert unneeded change in tramp-integration.el

* lisp/net/tramp-integration.el:
Apply `connection-local-set-profiles' w/o retrieving old values.

Fix URL-related typos in comments and messages

* lisp/ffap.el (ffap-next): Fix typo in message.
* lisp/finder.el (finder-commentary): Fix typo in comment.

Improve safety of haiku-drag-message

* lisp/term/haiku-win.el (haiku-drag-and-drop): Ignore
placeholder message.
* src/frame.c (delete_frame): Prevent deleting drop source frame
on Haiku.
* src/haiku_support.cc (RELEASE_NOW, CANCEL_DROP): New message
types.
(class EmacsView, MessageReceived): Handle new message types.
(be_drag_message): Drag CANCEL_DROP message on quit; also send
RELEASE_NOW to view if quitting.

* src/haikuselect.c (syms_of_haikuselect)
(haiku_unwind_drag_message): Clear new frame variable.
(Fhaiku_drag_message): Set new frame variable.
* src/haikuterm.h: Update prototypes.

; * src/xterm.c: Improve commentary.

Clean up more PGTK code

* lisp/term/pgtk-win.el (featurep):
(pgtk):
(pgtk-use-im-context):
(pgtk-handle-nxopen):
(pgtk-handle-nxopentemp):
(pgtk-ignore-1-arg):
([C-drag-n-drop]):
([M-drag-n-drop]):
([C-M-drag-n-drop]):
(pgtk-alternate-modifier):
(pgtk-right-alternate-modifier):
(pgtk-right-command-modifier):
(pgtk-right-control-modifier):
(pgtk-do-hide-emacs):
(pgtk-hide-others):
(pgtk-do-hide-others):
(pgtk-emacs-info-panel):
(pgtk-do-emacs-info-panel):
(pgtk-next-frame):
(pgtk-prev-frame):
(after-make-frame-functions):
(tool-bar-mode):
(pgtk-toggle-toolbar):
(pgtk-print-buffer):
(scalable-fonts-allowed):
(pgtk-standard-fontset-spec):
(pgtk-store-cut-buffer-internal):
(pgtk-copy-including-secondary):
(pgtk-paste-secondary):
(pgtk-suspend-error):
(window-system-initialization):
(after-init-hook): Remove code mindlessly copied from ns-win.el,
delete unused custom group, write doc strings and rename
variables duplicated from X to their names on X.  Also reformat
comments and code.
(pgtk-use-im-context-handler): New function.

* src/pgtkfns.c (syms_of_pgtkfns): Delete useless
AppleScript (!) code copied from NS.
* src/pgtkselect.c: Write FIXME about selection API usage.

* src/pgtkterm.c (get_keysym_name): Implement correctly instead
of sprintf'ing the numeric value of the keysym into a static
buffer.
(pgtk_set_window_size):
(xg_scroll_callback): Delete code that was #if 0'd out and
doesn't make sense on PGTK.
(pgtk_delete_terminal): Remove misleading comment.

* src/emacs.c (main): Improve accuracy of daemon warning message on PGTK.

* src/xterm.c (x_dnd_send_unsupported_drop): Also handle TEXT target.

Preserve contents of PRIMARY when sending unsupported drop

* src/xterm.c (x_dnd_send_unsupported_drop): Set local value of
PRIMARY to the preexisting selection value, if any.

Port Org encode-time usage back to Emacs 25

* lisp/org/ol.el (org-store-link):
* lisp/org/org-clock.el (org-clock-sum)
(org-clock-update-time-maybe):
* lisp/org/org-colview.el (org-colview-construct-allowed-dates):
* lisp/org/org-macro.el (org-macro--vc-modified-time):
* lisp/org/org-macs.el (org-2ft, org-matcher-time):
* lisp/org/org-table.el (org-table-eval-formula):
* lisp/org/org.el (org-read-date, org-display-custom-time)
(org-time-string-to-time, org-timestamp-change):
Don’t assume Emacs 27 encode-time, since standalone Org still
works with Emacs 25 and it’s easier if we minimize differences
from standalone Org.  Problem reported by Max Nikulin (Bug#54731).
This reverts much of 2021-12-16T17:40:21Z!eggert@cs.ucla.edu.

* src/xterm.c (handle_one_xevent): Assert that hold_quit is present instead.

Pacify gcc -Wanalyzer-null-dereference

* src/xterm.c (handle_one_xevent): Don’t dereference HOLD_QUIT if
it’s null.  Potential problem found with gcc 11.2.1 20220127 (Red
Hat 11.2.1-9), when configured with --enable-gcc-warnings.

Allow completion wrapping in minibuffer completion navigation commands

* lisp/minibuffer.el (minibuffer-previous-completion)
(minibuffer-next-completion): Don't set completion-wrap-movement.

* test/lisp/ses-tests.el: Require ert-x, for ert-simulate-keys.

New commands for navigating completions from the minibuffer.

* lisp/simple.el (minibuffer-local-shell-command-map):
* lisp/minibuffer.el (minibuffer-local-completion-map):
Bind "M-<up>" to minibuffer-choose-previous-completion,
"M-<down>" to minibuffer-choose-next-completion,
"M-S-<up>" to minibuffer-previous-completion,
"M-S-<down>" to minibuffer-next-completion,
"M-RET" to minibuffer-choose-completion.
(with-minibuffer-completions-window): New macro.
(minibuffer-previous-completion, minibuffer-next-completion)
(minibuffer-choose-previous-completion)
(minibuffer-choose-next-completion)
(minibuffer-choose-completion): New commands.

https://lists.gnu.org/archive/html/emacs-devel/2022-03/msg00335.html

Use base prefix and suffix instead of completion-base-position (bug#49931)

* lisp/minibuffer.el (minibuffer-completion-help):
Set completion-base-affixes from base-prefix and base-suffix.
In completion-list-insert-choice-function handle
string values of start/end as prefix/suffix.

* lisp/simple.el (completion-base-affixes)
(completion-use-base-affixes): New variables.
(choose-completion): Let-bind base-affixes to completion-base-affixes.
Use base-affixes when completion-use-base-affixes is non-nil.
(completion-setup-function): Sync values of base-affixes and
completion-base-affixes.

Choosing a completion with a prefix argument doesn't exit the minibuffer

* lisp/simple.el (choose-completion): New optional args NO-EXIT and NO-QUIT.
(bug#47417)

* test/lisp/replace-tests.el: New tests for query-replace (bug#54733)

* test/lisp/replace-tests.el (query-replace-tests): New defconst.
(query-replace--perform-tests): New function.
(query-replace-tests, query-replace-search-function-tests): New ert-deftest.

; * admin/notes/emba: Fix typos

Reject invalid time-string in appt-add immediately

* lisp/calendar/appt.el (appt-add): Check the provided time-string for
validity immediately after reading it rather than after reading all
the parameters.  (Bug#54210)

Handle remote system processes

* doc/lispref/files.texi (Magic File Names):
Add list-system-processes and process-attributes.

* doc/lispref/processes.texi (System Processes): Document changes
in list-system-processes and process-attributes.

* doc/misc/tramp.texi (Customizing Completion): Use @ftable.
(Remote processes): Document changes in list-system-processes and
process-attributes.

* etc/NEWS: Document changes in proced, list-system-processes and
process-attributes.

* lisp/proced.el (proced-show-remote-processes): New defcustom.
(proced-remote-directory): Remove.
(proced-filter-alist): Use it.
(proced-user-name): New defun.
(proced-available): Set it to t.
(proced-mode): Adapt docstring.
(proced): Adapt docstring.  Acknowledge prefix argument.
(proced-format): Change initialization of `standard-attributes'.
(proced-send-signal, proced-renice): Adapt docstring.  Remove
special handling of prefix argument.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* lisp/net/tramp-archive.el (tramp-archive-file-name-handler-alist):
* lisp/net/tramp-crypt.el (tramp-crypt-file-name-handler-alist):
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* lisp/net/tramp-rclone.el (tramp-rclone-file-name-handler-alist):
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist):
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
* lisp/net/tramp-sshfs.el (tramp-sshfs-file-name-handler-alist):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-file-name-handler-alist):
Add 'list-system-processes' and `process-attributes'.

* lisp/net/tramp-integration.el (files-x): Require `files-x'.
(tramp-bsd-process-attributes-ps-args)
(tramp-bsd-process-attributes-ps-format)
(tramp-connection-local-bsd-ps-variables)
(tramp-busybox-process-attributes-ps-args)
(tramp-busybox-process-attributes-ps-format)
(tramp-connection-local-busybox-ps-variables):
* lisp/net/tramp-adb.el (tramp-adb-connection-local-default-ps-variables):
New defconsts.  Add them to connection-local variables.

* lisp/net/tramp.el (tramp-file-name-for-operation):
Add 'list-system-processes' and `process-attributes'.
(tramp-process-attributes-ps-args)
(tramp-process-attributes-ps-format): New defconsts.
(tramp-ps-time, tramp-get-process-attributes)
(tramp-handle-list-system-processes)
(tramp-handle-process-attributes): New defuns.

* src/process.c (Flist_system_processes, Fprocess_attributes):
Support remote system processes.
(Qlist_system_processes, Qprocess_attributes): Declare symbols.

Mark some data during drag-and-drop

It doesn't make sense to prevent the return frame or movement
frame from being deleted, but we should at least protect them
from garbage collection.

* src/alloc.c (garbage_collect): Call mark_xterm.
* src/xterm.c (x_dnd_begin_drag_and_drop)
(x_dnd_cleanup_drag_and_drop): Clear movement and return frames
upon DND completion.
(mark_xterm): Mark those frames.
* src/xterm.h: Update prototypes.

Fix some details in completions

* lisp/minibuffer.el (completion--insert-one-column) : Remove the extra
new-line at the end.
* lisp/simple.el (next-completion) : Fix behavior when
completion-wrap-movement and remove bobp and eobp. This removes the
extra tab ad the end of the list before wrapping or going to the
minibuffer and apparently also fixes bug#54374
(switch-to-completions) : Simplify condition code and remove comment not
applicable anymore.

; * lisp/term/haiku-win.el: Fix compiler warning on X.

Allow dropping text to the root window

* src/xterm.c (x_dnd_send_unsupported_drop): Allow dropping to
the root window.
(handle_one_xevent): Send unsupported drops to the last toplevel
instead of the target window.

Add support for dragging text onto windows that don't support any DND protocol

* src/xselect.c (x_own_selection): Export function.
(x_handle_selection_request): Handle selection requests to the
pending DND time.
(x_set_pending_dnd_time): New function.

* src/xterm.c (x_dnd_send_unsupported_drop): New function.
Implement according to the suggestions in the XDND protocol
specification.
(x_dnd_get_target_window): Return the toplevel window as well.
(x_dnd_cleanup_drag_and_drop, x_dnd_begin_drag_and_drop)
(x_dnd_update_state, handle_one_xevent): Send unsupported drops
and use last seen toplevel instead of target for `return_frame'.
* src/xterm.h: Update prototypes.

* configure.ac (HAVE_GIF): Respect --with-gif on PGTK.  (bug#54633)

Respect new DND options when dragging to ourselves on Haiku

* lisp/mouse.el (mouse-drag-and-drop-region): Allow dragging to
the current frame if we know `return-frame' doesn't work.
* lisp/term/haiku-win.el (haiku-dnd-drag-handler): New function.
* src/haiku_support.cc (MouseMoved): Don't send drag motion
events for the drag frame.
* src/haikuselect.c (haiku_note_drag_motion_1)
(haiku_note_drag_motion_2, haiku_note_drag_motion): New
functions.
(syms_of_haikuselect): New variable `haiku-drag-track-function'.
* src/haikuterm.c (haiku_read_socket): Note mouse motion in that
case.q
* src/haikuterm.h: Update prototypes.

* lisp/progmodes/cc-cmds.el (indent-new-comment-line): Delete advice

This piece of advice was effective only for Emacs<20.1 and old XEmacs
(at least older than Aug 2007).

OClosure: add support for `slot-value`

* lisp/emacs-lisp/oclosure.el (oclosure--slot-index)
(oclosure--slot-value, oclosure--set-slot-value): New functions.

* lisp/emacs-lisp/eieio-core.el (eieio-oset, eieio-oref):
Consolidate the type test.  Use `oclosure--(set-)slot-value`.
(eieio--validate-slot-value, eieio--validate-class-slot-value):
Don't presume `class` is an EIEIO class.
(eieio--class): Fix bogus `:type` info.
(eieio--object-class): Simplify.
(eieio--known-slot-name-p): New function.
(eieio-oref, eieio-oref-default, eieio-oset-default): Use it.

* test/lisp/emacs-lisp/oclosure-tests.el: Require `eieio`.
(oclosure-test): Make `name` field mutable.
(oclosure-test-slot-value): New test.

; * src/alloc.c (grow_mark_stack): Remove unused variable.

SES with case insensitive cell names for jumping.

* doc/misc/ses.texi (The Basics): Document that ses-jump may be
customized.
(Customizing @acronym{SES}): Document new customisations for ses-jump.

* lisp/ses.el (ses-jump-cell-name-function)
(ses-jump-prefix-function): New defcustoms.
(ses-jump-prefix): New defun.
(ses-jump): Make ses-jump use the new defcustoms.

* test/lisp/ses-tests.el (ses-jump-B2-prefix-arg)
(ses-jump-B2-lowcase, ses-jump-B2-lowcase-keys)
(ses-jump-B2-symbol, ses-jump-B2-renamed): New tests.

Reduce GC mark-phase recursion by using explicit stack (bug#54698)

An explict stack of objects to be traversed for marking replaces
recursion for most common object types: conses, vectors, records, hash
tables, symbols, functions etc.  Recursion is still used for other
types but those are less common and thus not as likely to cause a
problem.

The stack grows dynamically as required which eliminates almost all C
stack overflow crashes in the GC.  There is also a nontrivial GC
performance improvement.

* src/alloc.c (GC_REMEMBER_LAST_MARKED, GC_CDR_COUNT): New.
(mark_char_table, struct mark_entry):
Remove (subsumed into process_mark_stack).
(struct mark_entry, struct mark_stack, mark_stk)
(mark_stack_empty_p, mark_stack_pop, grow_mark_stack)
(mark_stack_push_value, mark_stack_push_values)
(process_mark_stack): New.
(mark_object, mark_objects):
Just push the object(s) and let process_mark_stack do the work.

Use correct signal oldset in posix_spawn implementation

posix_spawn was restoring the wrong signal set, which still had
SIGCHLD and SIGINT masked, causing problems with child processes that
spawned child processes.  (Bug#54667)

See the thread ending at
https://lists.gnu.org/archive/html/emacs-devel/2022-03/msg00067.html
for more details.

* src/callproc.c (emacs_spawn): Pass oldset parameter.
(emacs_posix_spawn_init_attributes): Use correct oldset.
(emacs_posix_spawn_init): Remove intermediate function.

test/lisp/edmacro-tests.el: Adjust to recent changes

edmacro.el: Silence warnings due to kmacro changes

* lisp/edmacro.el (edit-kbd-macro): Use `kmacro-p` and kmacro accessors.
(edmacro-finish-edit): Use `kmacro-p` and the new `kmacro` constructor.

Handle mouse movement correctly during DND from one of our own frames

* lisp/dnd.el (dnd-handle-movement): Select the window specified
in posn.
* lisp/term/x-win.el (x-dnd-movement): New function.
(x-dnd-movement-function): Set it as the default.
* src/frame.c (delete_frame): Prevent deleting the drop source
frame.
* src/xterm.c (x_dnd_send_position): Set new mouse movement
flags if the target window is one of our own frames.
(x_dnd_begin_drag_and_drop): Call DND movement function whenever
appropriate.
(x_free_frame_resources): Remove useless code.
(syms_of_xterm): New defvar `x-dnd-movement-function'.
* src/xterm.h: Update prototypes.

Fix generation of extra DND events while dragging on Haiku

* src/haiku_support.cc (be_drag_message): Set new DND flag.
(be_drag_and_drop_in_progress): New function.
* src/haiku_support.h: Update prototypes.
* src/haikuterm.c (haiku_read_socket): Don't store DND motion
events if DND is in progress.

* src/xterm.c: Explain meaning of drag-and-drop state variables.

Further fixes for cl--generic-describe and (function ...)

* lisp/emacs-lisp/cl-generic.el (cl--generic-describe): Fix the #'
problem for defmethods, too (bug#54628).

Inline call0..8

Inlining these trivial functions gives a healthy speed boost to many
common functions such as `sort`, `mapcar` etc.

* src/eval.c (call0, ..., call8): Move functions...
* src/lisp.h (call0, ..., call8): ...here and declare them inline.

Speed up comparisons between 2 fixnums

Since <, <=, > and >= have their own byte-ops, the corresponding
functions are mostly used as arguments to higher-order functions.
This optimisation is particularly beneficial for sorting, where the
comparison function is time-critical.

* src/data.c (Flss, Fgtr, Fleq, Fgeq):
* src/fileio.c (Fcar_less_than_car):
Fast path for calls with 2 fixnum arguments.

Rewrite string-greaterp and string> using string-lessp

Since string-lessp has its own byte-op, using it is much faster than
calling string-greaterp even with the need to bind a temporary
variable.

* lisp/emacs-lisp/byte-opt.el (byte-optimize-string-greaterp): New.
(string-greaterp, string>): Set byte-optimizer.