if ((context != last_context) && ((last_button & BUTTON_REL) == 0)
#ifdef HAVE_SCROLLWHEEL
        /* Scrollwheel doesn't generate release events  */
        && !(last_button & (BUTTON_SCROLL_BACK | BUTTON_SCROLL_FWD))
#endif
        )
    {
        if (button & BUTTON_REL)
        {
            last_button = button;
            last_action = ACTION_NONE;
        }
        /* eat all buttons until the previous button was |BUTTON_REL
           (also eat the |BUTTON_REL button) */
        return ACTION_NONE; /* "safest" return value */
    }