Fix: Fixes crash using back button with zoomed graph (#19122)

Fixes: #19114

public/app/features/explore/state/reducers.test.ts

@@ -20,6 +20,7 @@ import {
   scanStopAction,
   toggleGraphAction,
   toggleTableAction,
+  changeRangeAction,
 } from './actionTypes';
 import { Reducer } from 'redux';
 import { ActionOf } from 'app/core/redux/actionCreatorFactory';
@@ -27,7 +28,7 @@ import { updateLocation } from 'app/core/actions/location';
 import { serializeStateToUrlParam } from 'app/core/utils/explore';
 import TableModel from 'app/core/table_model';
 import { DataSourceApi, DataQuery } from '@grafana/ui';
-import { LogsModel, LogsDedupStrategy } from '@grafana/data';
+import { LogsModel, LogsDedupStrategy, dateTime } from '@grafana/data';
 
 describe('Explore item reducer', () => {
   describe('scanning', () => {
@@ -196,6 +197,31 @@ describe('Explore item reducer', () => {
       });
     });
   });
+
+  describe('changing range', () => {
+    describe('when changeRangeAction is dispatched', () => {
+      it('then it should set correct state', () => {
+        reducerTester()
+          .givenReducer(itemReducer, {
+            update: { ...makeInitialUpdateState(), range: true },
+            range: null,
+            absoluteRange: null,
+          })
+          .whenActionIsDispatched(
+            changeRangeAction({
+              exploreId: ExploreId.left,
+              absoluteRange: { from: 1546297200000, to: 1546383600000 },
+              range: { from: dateTime('2019-01-01'), to: dateTime('2019-01-02'), raw: { from: 'now-1d', to: 'now' } },
+            })
+          )
+          .thenStateShouldEqual({
+            update: { ...makeInitialUpdateState(), range: false },
+            absoluteRange: { from: 1546297200000, to: 1546383600000 },
+            range: { from: dateTime('2019-01-01'), to: dateTime('2019-01-02'), raw: { from: 'now-1d', to: 'now' } },
+          });
+      });
+    });
+  });
 });
 
 export const setup = (urlStateOverrides?: any) => {

public/app/features/explore/state/reducers.ts

@@ -540,6 +540,7 @@ export const itemReducer = reducerFactory<ExploreItemState>({} as ExploreItemSta
         ...state,
         range,
         absoluteRange,
+        update: makeInitialUpdateState(),
       };
     },
   })