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Rename the args.  Compute x and y fields from negative positions.
Use XGetWMNormalHints if X11R4 or newer.
(x_make_frame_visible): Call x_set_offset only if not USE_X_TOOLKIT.
(x_make_frame_invisible): Call x_wm_set_size_hint.
(x_set_offset): Pass 0 as 3rd arg to x_wm_set_size_hint.
(x_set_window_size): Likewise.  Set win_gravity field here if nec.