Revert my commit 29a9fd4f4ba17822eca0f00c2037da3868bd874e
and the following commit 1ec0889e7b786d79351cee3ed4964d82295f059f.
This fixes a bug where ‘emacs -nw’ would sometimes freeze when Emacs is
configured with ‘--with-pgtk --enable-link-time-optimization
--disable-gc-mark-trace’ on GNU/Linux x86-64 (Bug#76729).
As it is not yet clear whether this freeze is due to an Emacs bug that
I introduced, or due to GCC bug 117423
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117423>,
play it safe for now and revert to the previous state.

* src/androidterm.c (android_show_hourglass): Always define the
hourglass cursor, but...
(android_hide_hourglass): ... restore the invisible cursor
subsequently, if need be.
(android_toggle_visible_pointer): Do not hide the current cursor
if it is an hourglass.

Simplify by using separate local vars for struct input_event and
struct selection_input_event, rather than a single local var that
is the union of the two.  This makes the code easier to follow by
the human reader, and should help avoid GCC bug 117423
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117423> and
therefore work around Emacs bug 76559 <https://bugs.gnu.org/76559>.
* src/androidterm.c (handle_one_android_event):
* src/gtkutil.c (xg_widget_key_press_event_cb):
* src/pgtkterm.c (evq_flush):
* src/xterm.c (handle_one_xevent): Use struct input_event and
kbd_buffer_store_event_hold, or struct selection_input_event and
kbd_buffer_store_selection_event_hold, rather than union
buffered_input_event and union buffered_input_event.
* src/keyboard.c (beware_long_paste, maybe_quit_while_no_input):
New functions, broken out from kbd_buffer_store_buffered_event.
(kbd_buffer_store_event_hold): Define here, with a simplified
version of the body of the old kbd_buffer_store_buffered_event,
rather than defining in keyboard.h.  Specialize to struct
input_event.
(kbd_buffer_store_selection_event_hold): New function; it is
a simplified version of the old kbd_buffer_store_buffered_event,
specialized to struct selection_input_event.
(is_ignored_event_kind): Accept enum event_kind instead of
union buffered_input_event.  All callers changed.
* src/keyboard.h (kbd_buffer_store_event_hold):
Remove definition, as keyboard.c now defines it.
* src/pgtkterm.c (evq_grow_if_needed): New function.
(evq_enqueue, evq_selection_enqueue): Two functions now,
not one.  Args are now struct input_event const * or
struct selection_input_event const *, not
union buffered_input_event *.  All callers changed.
This lets us simplify the callers so that they need
not use the union.

* src/androidterm.c (android_calc_absolute_position): New
function.
(android_set_offset): Call android_calc_absolute_position.

* src/pgtkterm.c (pgtk_calc_absolute_position): Synchronize with
X.

* src/window.c (last_mouse_window): New global var.  All static
instances removed, and all their uses replaced with this global
var.  This fixes a very unlikely bug where last_mouse_window was
GC’ed and a new window created in its place.  It also fixes several
places that assumed NIL_IS_ZERO without static_asserting it.
(init_window_once): Initialize the new var.

Run "TZ=UTC0 admin/update-copyright".

* src/alloc.c (string_bytes, pin_string, valid_lisp_object_p)
(process_mark_stack, survives_gc_p, syms_of_alloc):
* src/androidterm.c (android_term_init): Replace call to
'build_pure_c_string'.
* src/buffer.c (init_buffer_once, syms_of_buffer):
* src/bytecode.c (exec_byte_code):
* src/callint.c (syms_of_callint):
* src/callproc.c (syms_of_callproc):
* src/category.c (Fdefine_category):
* src/coding.c (syms_of_coding):
* src/comp.c (Fcomp__compile_ctxt_to_file0)
(maybe_defer_native_compilation, syms_of_comp):
* src/data.c (Fsetcar, Fsetcdr, Fdefalias, Faset, syms_of_data):
* src/dbusbind.c (syms_of_dbusbind):
* src/doc.c (Fsnarf_documentation):
* src/emacs-module.c (syms_of_module):
* src/eval.c (Finternal__define_uninitialized_variable)
(Fdefconst_1, define_error, syms_of_eval):
* src/fileio.c (syms_of_fileio):
* src/fns.c (Ffillarray, Fclear_string, check_mutable_hash_table):
* src/fontset.c (syms_of_fontset):
* src/frame.c (make_initial_frame):
* src/haikufns.c (syms_of_haikufns):
* src/intervals.c (create_root_interval):
* src/keyboard.c (syms_of_keyboard):
* src/keymap.c (Fmake_sparse_keymap, Fset_keymap_parent)
(store_in_keymap, syms_of_keymap):
* src/lisp.h:
* src/lread.c (Fload, read0, intern_c_string_1, define_symbol)
(Fintern, defsubr, syms_of_lread):
* src/pdumper.c (Fdump_emacs_portable):
* src/pgtkfns.c (syms_of_pgtkfns):
* src/pgtkterm.c (syms_of_pgtkterm):
* src/process.c (syms_of_process):
* src/search.c (syms_of_search):
* src/sqlite.c (syms_of_sqlite):
* src/syntax.c (syms_of_syntax):
* src/treesit.c (syms_of_treesit):
* src/w32fns.c (syms_of_w32fns):
* src/xdisp.c (syms_of_xdisp):
* src/xfaces.c (syms_of_xfaces):
* src/xfns.c (syms_of_xfns):
* src/xftfont.c (syms_of_xftfont):
* src/xterm.c (syms_of_xterm): Remove calls to 'PURE_P', 'CHECK_IMPURE',
'Fpurecopy', and replace calls to 'build_pure_c_string', 'pure_list',
'pure_listn', etc., by impure equivalents.

* java/org/gnu/emacs/EmacsView.java (onAttachedFromWindow):
Force a layout cycle rather than report exposure immediately.
(prepareForLayout): Delete function.

* java/org/gnu/emacs/EmacsWindow.java (mapWindow): Remove
redundant calls to prepareForLayout.

* src/androidterm.c (handle_one_android_event): Do not swap
buffers when exposure is registered by a frame only partially
updated.