rem: EmpathTaskWidget::s_done(EmpathTaskItem * item)
add: EmpathTaskItem::s_done()
context: EmpathTaskWidget::s_done(EmpathTaskItem * item){    QListIterator<EmpathTaskItem> it(itemList_);    itemList_.remove(item);        int i = 0;        for (; it.current(); ++it) {                it.current()->move(            0, it.current()->minimumSizeHint().height() * i++);    }        setFixedHeight(itemHeight_ * itemList_.count());}