[sql lab] fix user timestamp is off (#2774)

Author: mistercrunch

superset/assets/javascripts/SqlLab/components/QueryAutoRefresh.jsx

@@ -36,7 +36,7 @@ class QueryAutoRefresh extends React.PureComponent {
   stopwatch() {
     // only poll /superset/queries/ if there are started or running queries
     if (this.shouldCheckForQueries()) {
-      const url = '/superset/queries/' + (this.props.queriesLastUpdate - QUERY_UPDATE_BUFFER_MS);
+      const url = `/superset/queries/${this.props.queriesLastUpdate - QUERY_UPDATE_BUFFER_MS}`;
       $.getJSON(url, (data) => {
         if (Object.keys(data).length > 0) {
           this.props.actions.refreshQueries(data);

superset/assets/javascripts/SqlLab/reducers.js

@@ -233,19 +233,22 @@ export const sqlLabReducer = function (state, action) {
       let newQueries = Object.assign({}, state.queries);
       // Fetch the updates to the queries present in the store.
       let change = false;
+      let queriesLastUpdate = state.queriesLastUpdate;
       for (const id in action.alteredQueries) {
         const changedQuery = action.alteredQueries[id];
         if (!state.queries.hasOwnProperty(id) ||
             (state.queries[id].changedOn !== changedQuery.changedOn &&
             state.queries[id].state !== 'stopped')) {
+          if (changedQuery.changedOn > queriesLastUpdate) {
+            queriesLastUpdate = changedQuery.changedOn;
+          }
           newQueries[id] = Object.assign({}, state.queries[id], changedQuery);
           change = true;
         }
       }
       if (!change) {
         newQueries = state.queries;
       }
-      const queriesLastUpdate = now();
       return Object.assign({}, state, { queries: newQueries, queriesLastUpdate });
     },
   };