            addQuery(event.detail);
        });
        function removeQuery(queryInfo) {
            let old = configs[queryInfo.serial];
            if (old) {
                let leftQueryElt = old.leftElt;
                let rightQueryElt = old.rightElt;
                leftQueryElt.parentNode.removeChild(leftQueryElt);
                rightQueryElt.parentNode.removeChild(rightQueryElt);
                delete configs[queryInfo.serial];
            }
        }
        function addQuery(queryInfo) {
   