(mac_copy_area, mac_copy_area_with_mask): Restore background color.
(mac_handle_visibility_change): New function. (x_make_frame_invisible, x_iconify_frame) (XTread_socket) [!USE_CARBON_EVENTS]: Use it. [USE_CARBON_EVENTS] (mac_handle_window_event) (install_window_handler): Handle visibilty change events. (x_make_frame_visible): Don't reposition window if it is iconified or asked for visible before. Select and uncollapse window when it is made visible. (x_make_frame_invisible): Don't reset x_highlight_frame. (x_iconify_frame): Likewise. Make invisible frame visible before it is iconified. (read_socket_inev): Move variable outside #if USE_CARBON_EVENTS. (do_window_update): Don't change visibility of invisible frame.
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