MOUSE_POSCHANGED
act->flags = ((act->dx || act->dy || act->dz) ? MOUSE_POSCHANGED : 0)
act->flags = ((act->dx || act->dy || act->dz) ? MOUSE_POSCHANGED : 0)
flags = a2->flags & MOUSE_POSCHANGED;
act2->flags = ((act2->dx || act2->dy || act2->dz) ? MOUSE_POSCHANGED : 0)
act->flags |= MOUSE_POSCHANGED; /* force update */
act->flags |= MOUSE_POSCHANGED;
flags &= MOUSE_POSCHANGED;