* Visit all child nodes of the given node starting with the last one until one node returns
 * false. Then visitAll returns false, otherwise true.
 * @param node the parent node whose children will be visited
 * @param breakOnFail break if one of the children returns false on accept
 * @return true if none of the childnodes returns false on
 * accepting the visitor.
bool KisNodeVisitor::visitAllInverse(KisNode * node, bool breakOnFail)
    KisNodeSP child = node->lastChild();
    while (child) {
        if (!child->accept(*this)) {
            if (breakOnFail)
                return false;
        child = child->prevSibling();
    return true;