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(Fwindow_edges, Fwindow_pixel_edges, Fwindow_inside_edges)
(Fwindow_absolute_pixel_edges, Fwindow_inside_absolute_pixel_edges)
(Fwindow_inside_pixel_edges, Fpos_visible_in_window_p)
(Fwindow_line_height): Use it.
(Fwindow_fringes): Use list3.
(Fwindow_scroll_bars): Use list4.
(Fwindow_frame, Fwindow_top_child, Fwindow_left_child)
(Fwindow_combination_limit): Allow zero number of arguments.