timeline has the own member, so can just use timeline, not ownUserId

src/domain/session/SessionViewModel.js

@@ -153,10 +153,7 @@ export class SessionViewModel extends ViewModel {
     _createRoomViewModel(roomId) {
         const room = this._sessionContainer.session.rooms.get(roomId);
         if (room) {
-            const roomVM = new RoomViewModel(this.childOptions({
+            const roomVM = new RoomViewModel(this.childOptions({room}));
-                room,
-                ownUserId: this._sessionContainer.session.user.id,
-            }));
             roomVM.load();
             return roomVM;
         }
@@ -173,10 +170,7 @@ export class SessionViewModel extends ViewModel {
     async _createArchivedRoomViewModel(roomId) {
         const room = await this._sessionContainer.session.loadArchivedRoom(roomId);
         if (room) {
-            const roomVM = new RoomViewModel(this.childOptions({
+            const roomVM = new RoomViewModel(this.childOptions({room}));
-                room,
-                ownUserId: this._sessionContainer.session.user.id,
-            }));
             roomVM.load();
             return roomVM;
         }

src/domain/session/room/RoomViewModel.js

@@ -22,9 +22,8 @@ import {ViewModel} from "../../ViewModel.js";
 export class RoomViewModel extends ViewModel {
     constructor(options) {
         super(options);
-        const {room, ownUserId} = options;
+        const {room} = options;
         this._room = room;
-        this._ownUserId = ownUserId;
         this._timelineVM = null;
         this._onRoomChange = this._onRoomChange.bind(this);
         this._timelineError = null;
@@ -46,7 +45,6 @@ export class RoomViewModel extends ViewModel {
             const timelineVM = this.track(new TimelineViewModel(this.childOptions({
                 room: this._room,
                 timeline,
-                ownUserId: this._ownUserId,
             })));
             this._timelineVM = timelineVM;
             this.emitChange("timelineViewModel");

src/domain/session/room/timeline/TimelineViewModel.js

@@ -38,9 +38,9 @@ import {ViewModel} from "../../../ViewModel.js";
 export class TimelineViewModel extends ViewModel {
     constructor(options) {
         super(options);
-        const {room, timeline, ownUserId} = options;
+        const {room, timeline} = options;
         this._timeline = this.track(timeline);
-        this._tiles = new TilesCollection(timeline.entries, tilesCreator(this.childOptions({room, timeline, ownUserId})));
+        this._tiles = new TilesCollection(timeline.entries, tilesCreator(this.childOptions({room, timeline})));
     }
 
     /**

src/domain/session/room/timeline/tiles/BaseMessageTile.js

@@ -20,7 +20,7 @@ import {getIdentifierColorNumber, avatarInitials, getAvatarHttpUrl} from "../../
 export class BaseMessageTile extends SimpleTile {
     constructor(options) {
         super(options);
-        this._isOwn = this._entry.sender === options.ownUserId;
+        this._isOwn = this._entry.sender === options.timeline.me.userId;
         this._date = this._entry.timestamp ? new Date(this._entry.timestamp) : null;
         this._isContinuation = false;
     }

src/matrix/room/timeline/Timeline.js

@@ -228,4 +228,8 @@ export class Timeline {
     get powerLevels() {
         return this._powerLevels;
     }
+
+    get me() {
+        return this._ownMember;
+    }
 }