* src/xdisp.c (window_text_pixel_size): Fix whitespace and braces.

* src/xdisp.c (Fwindow_text_pixel_size):
* etc/NEWS:
* doc/lispref/display.texi (Size of Displayed Text): Improve
wording of the documentation of the new argument of
'window-text-pixel-size'.

* doc/lispref/display.texi (Size of Displayed Text): Update
documentation.
* etc/NEWS: Announce new argument.
* src/xdisp.c (window_text_pixel_size): Allow controlling if
the iterator's ascent and descent will be appended to the
pixel height returned.  All callers changed.
(Fwindow_text_pixel_size): New argument `ignore-line-at-end'.
All callers changed.

* etc/NEWS: Fix a typo.

* doc/lispref/commands.texi (Touchscreen Events): Fix wording and
indexing.

* doc/lispref/commands.texi (Input Events): Add "Touchscreen
Events" to menu.
(Touchscreen Events): New node.
* etc/NEWS: Announce new event types.

* src/keyboard.c (make_lispy_event): Handle touchscreen events.
(syms_of_keyboard): New symbols `touchscreen-begin',
`touchscreen-end' and `touchscreen-update'.
* src/termhooks.h (enum event_kind): New touchscreen events.

* src/xfns.c (setup_xi_event_mask): Set up touch event mask if
appropriate.
(x_window) [USE_GTK]: Call `setup_xi_event_mask'.

* src/xterm.c (x_free_xi_devices): Free touchpoints.
(x_init_master_valuators): Handle all devices and set master and
touch mode flags appropriately.
(xi_reset_scroll_valuators_for_device_id):
(x_get_scroll_valuator_delta): Ignore slave devices.

(xi_link_touch_point):
(xi_unlink_touch_point):
(xi_find_touch_point): New functions.
(handle_one_xevent): Handle XI touch events and events from
non-master devices.

* src/xterm.h (struct xi_touch_point_t): New structure.
(struct xi_device_t): Add touchpoints field.

Do not warn about timestamps like (1 . 1000).  This warning was added
in Emacs 27 as a temporary transition aid, and has now served its
purpose.  These timestamps, which Emacs 26 and earlier treated as (HI
. LO) instead of as (TICKS . HZ), were never generated by Emacs
primitives, and in practice the warning seems to have been triggered
only by test cases designed to generate it.
* src/timefns.c (WARN_OBSOLETE_TIMESTAMPS): Remove.
All uses changed to assume it’s false.
(decode_lisp_time): Simplify by taking a bool instead of an
integer bitmask.  All uses changed.

* lisp/arc-mode.el (archive-unixdate):
* lisp/gnus/nnrss.el (nnrss-normalize-date):
* lisp/tar-mode.el (tar-clip-time-string):
Prefer format-time-string to reassembling current-time-string output.