* src/atimer.c (start_atimer):
* src/fns.c (strong_copy_hash_table):
* src/pgtkfns.c (Fx_create_frame):
* src/pgtkterm.c (pgtk_enumerate_devices, pgtk_term_init): Use
igc_xzalloc_ambig_with_label instead of igc_xzalloc_ambig.

* src/gtkutil.c (free_gc_handle_callback): New.
(xg_finish_scroll_bar_creation): Use it instead of free_glib_gc_handle.
* src/pgtkterm.c (xg_scroll_callback, xg_end_scroll_callback): Adapt to
gc_handles.

* src/pgtkmenu.c (menu_highlight_callback, menubar_selection_callback)
(popup_selection_callback):
* src/pgtkterm.c (size_allocate, pgtk_set_event_handler): Use
'gc_handle' or raw pointer, not 'glib_user_data'.

The new 'borders-respect-alpha-background' frame parameter, when
set to 't', will make window dividers and internal borders
respect the 'alpha-background' frame parameter. This allows
transparent gaps between windows.
* doc/lispref/frames.texi (Font and Color Parameters):
Document the change.
* src/frame.c (frame_parm_table, syms_of_frame)
(gui_set_borders_respect_alpha_background):
* src/frame.h (struct frame): Add frame parameter.
* src/androidfns.c (x_create_frame, android_create_tip_frame)
(android_frame_parm_handlers):
* src/haikufns.c (haiku_create_frame, haiku_create_tip_frame)
(haiku_frame_parm_handlers):
* src/nsfns.m (ns_frame_parm_handlers, x_create_frame):
* src/w32fns.c (x_create_frame, w32_create_tip_frame)
(w32_frame_parm_handlers): Add dummy parameters for backends
that don't support opacity.
* src/pgtkfns.c (pgtk_frame_parm_handlers, x_create_frame)
(pgtk_create_tip_frame):
* src/pgtkterm.c (pgtk_draw_window_divider):
* src/xfns.c (x_create_frame, x_create_tip_frame)
(x_frame_parm_handlers)
* src/xterm.c (x_draw_window_divider)
(x_clear_under_internal_border): Implement parameter on backends
that support opacity.

* src/pgtkfns.c:
* src/pgtkim.c:
* src/pgtkmenu.c:
* src/pgtkselect.c:
* src/pgtkterm.c:
* src/termcap.c:
* src/tparam.c: Delete superfluous comments explaining config.h.

argv as left after main has proccessed the command-line can differ
both in order and contents of the original command-line arguments,
which can lead to surprising results when restarting emacs on the
cooked argv through `kill-emacs'.

Starting from that observation, consistenly use variables
'initial_cmdline' on Windows, 'initial_argc', 'initial_argv' on
non-Windows, and 'initial_argv0' in all ports.

* src/lisp.h: Declare 'initial_argv0', limit declaration of
'initial_argv' and 'initial_argc' to non-Windows ports.
* src/emacs.c: Likewise, but for the definitions.
(init_cmdargs): Move initialization of 'initial_argv' and
'initial_argc' ...
(copy_args) [!WINDOWSNT]: ... to this new function ...
(main): ... and call that in 'main', also initializing
'initial_argv0' before the command-line processing.
* src/emacs.c (Fkill_emacs):
* src/pgtkterm.c (pgtk_term_init):
* src/sysdep.c (emacs_perror):
* src/xterm.c (x_term_init): Use 'initial_argv0' where only that
is required.  (Bug#77389)