Room List Store: Implement secondary filters (#29458)

* Implement the secondary filters

* Use the new filters in the store

* Write tests

src/stores/room-list-v3/RoomListStoreV3.ts

@@ -28,11 +28,22 @@ import { FavouriteFilter } from "./skip-list/filters/FavouriteFilter";
 import { UnreadFilter } from "./skip-list/filters/UnreadFilter";
 import { PeopleFilter } from "./skip-list/filters/PeopleFilter";
 import { RoomsFilter } from "./skip-list/filters/RoomsFilter";
+import { InvitesFilter } from "./skip-list/filters/InvitesFilter";
+import { MentionsFilter } from "./skip-list/filters/MentionsFilter";
+import { LowPriorityFilter } from "./skip-list/filters/LowPriorityFilter";
 
 /**
  * These are the filters passed to the room skip list.
  */
-const FILTERS = [new FavouriteFilter(), new UnreadFilter(), new PeopleFilter(), new RoomsFilter()];
+const FILTERS = [
+    new FavouriteFilter(),
+    new UnreadFilter(),
+    new PeopleFilter(),
+    new RoomsFilter(),
+    new InvitesFilter(),
+    new MentionsFilter(),
+    new LowPriorityFilter(),
+];
 
 /**
  * This store allows for fast retrieval of the room list in a sorted and filtered manner.

src/stores/room-list-v3/skip-list/filters/InvitesFilter.ts

@@ -0,0 +1,20 @@
+/*
+Copyright 2025 New Vector Ltd.
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { type Room, KnownMembership } from "matrix-js-sdk/src/matrix";
+
+import type { Filter } from ".";
+import { FilterKey } from ".";
+
+export class InvitesFilter implements Filter {
+    public matches(room: Room): boolean {
+        return room.getMyMembership() === KnownMembership.Invite;
+    }
+
+    public get key(): FilterKey.InvitesFilter {
+        return FilterKey.InvitesFilter;
+    }
+}

src/stores/room-list-v3/skip-list/filters/LowPriorityFilter.ts

@@ -0,0 +1,20 @@
+/*
+Copyright 2025 New Vector Ltd.
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import type { Room } from "matrix-js-sdk/src/matrix";
+import type { Filter } from ".";
+import { FilterKey } from ".";
+import { DefaultTagID } from "../../../room-list/models";
+
+export class LowPriorityFilter implements Filter {
+    public matches(room: Room): boolean {
+        return !!room.tags[DefaultTagID.LowPriority];
+    }
+
+    public get key(): FilterKey.LowPriorityFilter {
+        return FilterKey.LowPriorityFilter;
+    }
+}

src/stores/room-list-v3/skip-list/filters/MentionsFilter.ts

@@ -0,0 +1,20 @@
+/*
+Copyright 2025 New Vector Ltd.
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import type { Room } from "matrix-js-sdk/src/matrix";
+import type { Filter } from ".";
+import { FilterKey } from ".";
+import { RoomNotificationStateStore } from "../../../notifications/RoomNotificationStateStore";
+
+export class MentionsFilter implements Filter {
+    public matches(room: Room): boolean {
+        return RoomNotificationStateStore.instance.getRoomState(room).hasMentions;
+    }
+
+    public get key(): FilterKey.MentionsFilter {
+        return FilterKey.MentionsFilter;
+    }
+}

src/stores/room-list-v3/skip-list/filters/index.ts

@@ -11,6 +11,9 @@ export const enum FilterKey {
     UnreadFilter,
     PeopleFilter,
     RoomsFilter,
+    LowPriorityFilter,
+    MentionsFilter,
+    InvitesFilter,
 }
 
 export interface Filter {