g_signal_handler_block(textview, win->line_input_keypress_handler);
win->shutdown_keypress_handler = g_signal_connect(textview, "key-press-event", G_CALLBACK(on_shutdown_key_press_event), win);
g_signal_handler_block(textview, win->shutdown_keypress_handler);
g_signal_handler_block(textview, win->line_input_keypress_handler);
win->shutdown_keypress_handler = g_signal_connect(textview, "key-press-event", G_CALLBACK(on_shutdown_key_press_event), win);
g_signal_handler_block(textview, win->shutdown_keypress_handler);