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(syms_of_xfns): Intern and staticpro them.
(x_frame_parms) <"fullscreen">: New parameter.
(x_fullscreen_move, x_set_fullscreen): New functions.
(x_set_frame_parameters): Support for Qfullscreen.
(x_real_positions): More accurate computation of the frame position.
(x_figure_window_size): Support full-screen frames.
(Fx_create_frame): Default the fullscreen parameter.