[INCLUDED_FCNTL]: Don't include fcntl.h again.
(XTread_socket, MotionNotify and LeaveNotify cases): If not in any frame, call clear_mouse_face. (x_term_init): Set frame_up_to_date_hook. (XTframe_up_to_date): New function. (XTupdate_begin): Turn off mouse face display, and defer it. (XTupdate_end): Undefer. (mouse_face_defer): New variable. (mouse_face_mouse_frame, mouse_face_mouse_x, mouse_face_mouse_y): New variables. (dumpglyphs): Handle HL = 3 by using mouse_face_face_id. (note_mouse_movement): Check for mouse face. (show_mouse_face, fast_find_position): New functions. (clear_mouse_face): New functions. (mouse_face_beg, mouse_face_end, mouse_face_face_id): New variables. (mouse_face_window): New variable. (syms_of_xterm): Init and staticpro it.
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