(it_props): Add an entry for composition.
(face_before_or_after_it_pos): For composition, check face of a character after the composition. (handle_composition_prop): New function. (get_next_display_element): Adjusted for the change of CHAR_STRING. (set_iterator_to_next): Handle the case that it->method == next_element_from_composition. (next_element_from_composition): New function. (message_dolog): Adjusted for the change of CHAR_STRING. (set_message_1): Likewise. (check_point_in_composition): New function. (reconsider_clip_changes): If point moved into or out of composition, set b->clip_changed to 1 to force updating of the screen. (disp_char_vector): Delete codes for a composite character. (decode_mode_spec_coding): Adjusted for the change of CHAR_STRING.
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