Fixes mutations with cursor

app/assets/javascripts/error_tracking/store/list/actions.js

@@ -76,14 +76,15 @@ export function clearRecentSearches({ commit }) {
 
 export const searchByQuery = ({ commit, dispatch }, query) => {
   const searchQuery = query.trim();
+  commit(types.SET_CURSOR, null);
   commit(types.SET_SEARCH_QUERY, searchQuery);
   commit(types.ADD_RECENT_SEARCH, searchQuery);
   dispatch('stopPolling');
   dispatch('startPolling');
 };
 
-export const sortByField = ({ commit, dispatch }, field, cursor) => {
-  commit(types.SET_CURSOR, cursor);
+export const sortByField = ({ commit, dispatch }, field) => {
+  commit(types.SET_CURSOR, null);
   commit(types.SET_SORT_FIELD, field);
   dispatch('stopPolling');
   dispatch('startPolling');

spec/frontend/error_tracking/store/list/actions_spec.js

@@ -79,6 +79,7 @@ describe('error tracking actions', () => {
         query,
         {},
         [
+          { type: types.SET_CURSOR, payload: null },
           { type: types.SET_SEARCH_QUERY, payload: query },
           { type: types.ADD_RECENT_SEARCH, payload: query },
         ],
@@ -95,10 +96,7 @@ describe('error tracking actions', () => {
         actions.sortByField,
         field,
         {},
-        [
-          { type: types.SET_CURSOR, payload: undefined },
-          { type: types.SET_SORT_FIELD, payload: field },
-        ],
+        [{ type: types.SET_CURSOR, payload: null }, { type: types.SET_SORT_FIELD, payload: field }],
         [{ type: 'stopPolling' }, { type: 'startPolling' }],
       );
     });