TAP_STATE_DRAGGING_DOWN
case TAP_STATE_DRAGGING_DOWN:
case TAP_STATE_DRAGGING_DOWN: state = "dragging-down"; break;
tap_transition(sc, TAP_STATE_DRAGGING_DOWN, &zero_timeval, 0,
case TAP_STATE_DRAGGING_DOWN:
case TAP_STATE_DRAGGING_DOWN:
case TAP_STATE_DRAGGING_DOWN: