fix: deleting a discussion from the profile does not visually remove it (#3799)

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

framework/core/js/src/common/compat.ts

@@ -4,6 +4,7 @@ import Session from './Session';
 import Store from './Store';
 import BasicEditorDriver from './utils/BasicEditorDriver';
 import evented from './utils/evented';
+import EventEmitter from './utils/EventEmitter';
 import KeyboardNavigatable from './utils/KeyboardNavigatable';
 import liveHumanTimes from './utils/liveHumanTimes';
 import ItemList from './utils/ItemList';
@@ -97,6 +98,7 @@ export default {
   Store: Store,
   'utils/BasicEditorDriver': BasicEditorDriver,
   'utils/evented': evented,
+  'utils/EventEmitter': EventEmitter,
   'utils/KeyboardNavigatable': KeyboardNavigatable,
   'utils/liveHumanTimes': liveHumanTimes,
   'utils/ItemList': ItemList,

framework/core/js/src/common/utils/EventEmitter.ts

@@ -0,0 +1,23 @@
+export default class EventEmitter {
+  protected events: any = {};
+
+  public constructor() {
+    this.events = {};
+  }
+
+  public on(event: string, listener: Function): EventEmitter {
+    if (!this.events[event]) {
+      this.events[event] = [];
+    }
+
+    this.events[event].push(listener);
+
+    return this;
+  }
+
+  public emit(event: string, ...args: any[]): void {
+    if (this.events[event]) {
+      this.events[event].forEach((listener: Function) => listener(...args));
+    }
+  }
+}

framework/core/js/src/forum/states/DiscussionListState.ts

@@ -2,16 +2,22 @@ import app from '../../forum/app';
 import PaginatedListState, { Page, PaginatedListParams, PaginatedListRequestParams } from '../../common/states/PaginatedListState';
 import Discussion from '../../common/models/Discussion';
 import { ApiResponsePlural } from '../../common/Store';
+import EventEmitter from '../../common/utils/EventEmitter';
 
 export interface DiscussionListParams extends PaginatedListParams {
   sort?: string;
 }
 
+const globalEventEmitter = new EventEmitter();
+
 export default class DiscussionListState<P extends DiscussionListParams = DiscussionListParams> extends PaginatedListState<Discussion, P> {
   protected extraDiscussions: Discussion[] = [];
+  protected eventEmitter: EventEmitter;
 
   constructor(params: P, page: number = 1) {
     super(params, page, 20);
+
+    this.eventEmitter = globalEventEmitter.on('discussion.deleted', this.deleteDiscussion.bind(this));
   }
 
   get type(): string {
@@ -77,6 +83,10 @@ export default class DiscussionListState<P extends DiscussionListParams = Discus
   }
 
   removeDiscussion(discussion: Discussion): void {
+    this.eventEmitter.emit('discussion.deleted', discussion);
+  }
+
+  deleteDiscussion(discussion: Discussion): void {
     for (const page of this.pages) {
       const index = page.items.indexOf(discussion);