Fix back button from posts going back twice instead of once (#2220)

lemmy-translations

@@ -1 +1 @@
-Subproject commit abd40d4737fa732321fd7b62e42bbfcd51081cb6
+Subproject commit b0d80808047eb547aa995e923e9c742e87cd8be7

src/shared/components/home/home.tsx

@@ -78,12 +78,7 @@ import {
   InitialFetchRequest,
 } from "../../interfaces";
 import { mdToHtml } from "../../markdown";
-import {
-  FirstLoadService,
-  HomeCacheService,
-  I18NextService,
-  UserService,
-} from "../../services";
+import { FirstLoadService, I18NextService, UserService } from "../../services";
 import {
   EMPTY_REQUEST,
   HttpService,
@@ -288,18 +283,12 @@ export class Home extends Component<any, HomeState> {
         postsRes,
         isIsomorphic: true,
       };
-
-      HomeCacheService.postsRes = postsRes;
     }
 
     this.state.tagline = getRandomFromList(this.state?.siteRes?.taglines ?? [])
       ?.content;
   }
 
-  componentWillUnmount() {
-    HomeCacheService.activate();
-  }
-
   async componentDidMount() {
     if (
       !this.state.isIsomorphic ||
@@ -812,15 +801,6 @@ export class Home extends Component<any, HomeState> {
     const { dataType, pageCursor, listingType, sort } = getHomeQueryParams();
 
     if (dataType === DataType.Post) {
-      if (HomeCacheService.active) {
-        const { postsRes, scrollY } = HomeCacheService;
-        HomeCacheService.deactivate();
-        this.setState({ postsRes });
-        window.scrollTo({
-          left: 0,
-          top: scrollY,
-        });
-      } else {
       this.setState({ postsRes: LOADING_REQUEST });
       this.setState({
         postsRes: await HttpService.client.getPosts({
@@ -831,9 +811,6 @@ export class Home extends Component<any, HomeState> {
           type_: listingType,
         }),
       });
-
-        HomeCacheService.postsRes = this.state.postsRes;
-      }
     } else {
       this.setState({ commentsRes: LOADING_REQUEST });
       this.setState({

src/shared/services/HomeCacheService.ts

@@ -1,60 +0,0 @@
-import { GetPostsResponse } from "lemmy-js-client";
-import { EMPTY_REQUEST, RequestState } from "./HttpService";
-
-/**
- * Service to cache home post listings and restore home state when user uses the browser back buttons.
- */
-export class HomeCacheService {
-  static #_instance: HomeCacheService;
-  historyIdx = 0;
-  scrollY = 0;
-  posts: RequestState<GetPostsResponse> = EMPTY_REQUEST;
-
-  get active() {
-    return (
-      this.historyIdx === window.history.state.idx + 1 &&
-      this.posts.state === "success"
-    );
-  }
-
-  deactivate() {
-    this.historyIdx = 0;
-  }
-
-  activate() {
-    this.scrollY = window.scrollY;
-    this.historyIdx = window.history.state.idx;
-  }
-
-  static get #Instance() {
-    return this.#_instance ?? (this.#_instance = new this());
-  }
-
-  public static get scrollY() {
-    return this.#Instance.scrollY;
-  }
-
-  public static get historyIdx() {
-    return this.#Instance.historyIdx;
-  }
-
-  public static set postsRes(posts: RequestState<GetPostsResponse>) {
-    this.#Instance.posts = posts;
-  }
-
-  public static get postsRes() {
-    return this.#Instance.posts;
-  }
-
-  public static get active() {
-    return this.#Instance.active;
-  }
-
-  public static deactivate() {
-    this.#Instance.deactivate();
-  }
-
-  public static activate() {
-    this.#Instance.activate();
-  }
-}

src/shared/services/index.ts

@@ -1,5 +1,4 @@
 export { FirstLoadService } from "./FirstLoadService";
-export { HomeCacheService } from "./HomeCacheService";
 export { HttpService } from "./HttpService";
 export { I18NextService } from "./I18NextService";
 export { UserService } from "./UserService";