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how many colors can be displayed.

* xterm.c (x_calc_absolute_position): Call x_real_positions
  to get WM window sizes and use those to calculate position.
  (x_set_offset): Removed code commented out.

src/keyboard.c (adjust_point_for_property): #ifdef-out dodgy xassert

of Asian fonts, and some long awaited header cleanup and centralization.

Merge some minor redisplay bug-fixes from emacs--tiling--0

Patches applied:

 * miles@gnu.org--gnu-2004/emacs--tiling--0--patch-9
   Remove bogus xassert

 * miles@gnu.org--gnu-2004/emacs--tiling--0--patch-10
   Avoid negative descents for images with ascent > height

 * miles@gnu.org--gnu-2004/emacs--tiling--0--patch-13
   Fix iterator-inconsistency bug in redisplay

(USAGE2): Second half of the old USAGE1.
(USAGE3): Renamed from USAGE2.
(USAGE4): Renamed from USAGE3.

Remove unused `gu' alternative.

controlling emulation of a three button mouse with option and
command keys.
(Qreverse, mac_get_enumlated_btn): Handle the emulation
(mac_event_to_emacs_modifiers, XTread_socket): Ditto

bits from char to short to facilitate wider bitmaps.
(struct redisplay_interface): Fix prototype of define_fringe_bitmap
member.

time_stamp.
(Fx_get_selection_internal): Ditto, pass time_stamp to
x_get_foreign_selection.

* data.c (Fbyteorder): New function.