Sort epic list in issue sidebar by title

Changelog: changed
EE: true

app/assets/javascripts/sidebar/components/sidebar_dropdown_widget.vue

@@ -20,6 +20,7 @@ import {
   IssuableAttributeType,
   issuableAttributesQueries,
   noAttributeId,
+  defaultEpicSort,
 } from '../constants';
 
 export default {
@@ -118,6 +119,7 @@ export default {
           fullPath: this.attrWorkspacePath,
           title: this.searchTerm,
           state: this.$options.IssuableAttributeState[this.issuableAttribute],
+          sort: this.issuableAttribute === IssuableType.Epic ? defaultEpicSort : null,
         };
       },
       update(data) {

app/assets/javascripts/sidebar/constants.js

@@ -37,6 +37,8 @@ import projectMilestonesQuery from './queries/project_milestones.query.graphql';
 
 export const ASSIGNEES_DEBOUNCE_DELAY = 250;
 
+export const defaultEpicSort = 'TITLE_ASC';
+
 export const assigneesQueries = {
   [IssuableType.Issue]: {
     query: getIssueAssignees,

ee/spec/frontend/sidebar/components/sidebar_dropdown_widget_spec.js

@@ -450,8 +450,9 @@ describe('SidebarDropdownWidget', () => {
 
             expect(groupEpicsSpy).toHaveBeenNthCalledWith(1, {
               fullPath: mockIssue.groupPath,
-              title: '',
+              sort: 'TITLE_ASC',
               state: 'opened',
+              title: '',
             });
           });
 
@@ -474,8 +475,9 @@ describe('SidebarDropdownWidget', () => {
 
               expect(groupEpicsSpy).toHaveBeenNthCalledWith(2, {
                 fullPath: mockIssue.groupPath,
-                title: mockSearchTerm,
+                sort: 'TITLE_ASC',
                 state: 'opened',
+                title: mockSearchTerm,
               });
             });
           });

spec/frontend/sidebar/components/sidebar_dropdown_widget_spec.js

@@ -451,8 +451,9 @@ describe('SidebarDropdownWidget', () => {
 
             expect(projectMilestonesSpy).toHaveBeenNthCalledWith(1, {
               fullPath: mockIssue.projectPath,
-              title: '',
+              sort: null,
               state: 'active',
+              title: '',
             });
           });
 
@@ -477,8 +478,9 @@ describe('SidebarDropdownWidget', () => {
 
               expect(projectMilestonesSpy).toHaveBeenNthCalledWith(2, {
                 fullPath: mockIssue.projectPath,
-                title: mockSearchTerm,
+                sort: null,
                 state: 'active',
+                title: mockSearchTerm,
               });
             });
           });