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

* src/xfns.c (x_window): Turn a pointer to struct frame into a pointer
to a pointer to struct frame, allocate with 'igc_xzalloc' if HAVE_MPS,
'xmalloc' otherwise.
* src/widget.c (resources):
(get_default_char_pixel_size):
(pixel_to_char_size):
(char_to_pixel_size):
(set_frame_size):
(update_various_frame_slots):
(update_from_various_frame_slots):
(EmacsFrameInitialize):
(EmacsFrameRealize):
(EmacsFrameDestroy):
(EmacsFrameResize):
(EmacsFrameSetCharSize):
(EmacsFrameExpose):
(widget_store_internal_border):
* src/widgetprv.h (EmacsFramePart): Adjust accordingly.

* src/widget.c (get_wm_shell): Return WMShellWidget.
(update_wm_hints, widget_update_wm_size_hints): Return whether
or not size hints changed.
* src/widget.h: Delete `size_switch'.
* src/widgetprv.h (EmacsFramePart): Likewise.
* src/xterm.c (x_wm_set_size_hint): Set size hints the usual way
if Xt did not set them.  (bug#58412)

* src/widget.c (update_wm_hints): Force a resource to change
every time this function is called.  (bug#57475)
(EmacsFrameInitialize): Initialize new field.
* src/widgetprv.h (EmacsFramePart): New field `size_switch'.
* src/xterm.c (x_wm_set_size_hint): Don't change flags if flags
is 0.

* src/widget.c (emacsFrameClassRec): Don't inherit expose proc.
(get_default_char_pixel_size):
(pixel_to_char_size):
(char_to_pixel_size):
(round_size_to_char):
(EmacsFrameInitialize):
(EmacsFrameRealize):
(EmacsFrameResize): Clean up coding style.
(EmacsFrameExpose): New function.  Expose the frame here to
satisfy the toolkit when it calls the expose proc by hand.

* src/xterm.c (handle_one_xevent): Handle exposure through the
widget instead.