Gets the size that has been set on the layout, and that determines the total extents of the layout's scrollbar area. See gtk_layout_set_size().
location to store the width set on layout, or NULL. out[allow-none]
location to store the height set on layout, or NULL. out[allow-none]
See Implementation
Gets the size that has been set on the layout, and that determines the total extents of the layout's scrollbar area. See gtk_layout_set_size().