Handle remaining cases for room updates in new room list

For element-hq/element-web#13635

This adds support for:
* Tag changes
* DM changes
* Marking our own rooms as read
* Our own membership changes

The remaining branch we didn't need was the alternate 'new room' branch, so it was removed.

This is not optimized - optimization is deferred.

src/stores/room-list/RoomListStore2.ts

@@ -145,13 +145,19 @@ export class RoomListStore2 extends AsyncStore<ActionPayload> {
             // First see if the receipt event is for our own user. If it was, trigger
             // a room update (we probably read the room on a different device).
             if (readReceiptChangeIsFor(payload.event, this.matrixClient)) {
-                // TODO: Update room now that it's been read
-                console.log(payload);
+                console.log(`[RoomListDebug] Got own read receipt in ${payload.event.roomId}`);
+                const room = this.matrixClient.getRoom(payload.event.roomId);
+                if (!room) {
+                    console.warn(`Own read receipt was in unknown room ${payload.event.roomId}`);
+                    return;
+                }
+                await this.handleRoomUpdate(room, RoomUpdateCause.ReadReceipt);
                 return;
             }
         } else if (payload.action === 'MatrixActions.Room.tags') {
-            // TODO: Update room from tags
-            console.log(payload);
+            const roomPayload = (<any>payload); // TODO: Type out the dispatcher types
+            console.log(`[RoomListDebug] Got tag change in ${roomPayload.room.roomId}`);
+            await this.handleRoomUpdate(roomPayload.room, RoomUpdateCause.PossibleTagChange);
         } else if (payload.action === 'MatrixActions.Room.timeline') {
             const eventPayload = (<any>payload); // TODO: Type out the dispatcher types
 
@@ -189,23 +195,39 @@ export class RoomListStore2 extends AsyncStore<ActionPayload> {
             // cause inaccuracies with the list ordering. We may have to decrypt the last N messages of every room :(
             await this.handleRoomUpdate(room, RoomUpdateCause.Timeline);
         } else if (payload.action === 'MatrixActions.accountData' && payload.event_type === 'm.direct') {
-            // TODO: Update DMs
-            console.log(payload);
+            const eventPayload = (<any>payload); // TODO: Type out the dispatcher types
+            console.log(`[RoomListDebug] Received updated DM map`);
+            const dmMap = eventPayload.event.getContent();
+            for (const userId of Object.keys(dmMap)) {
+                const roomIds = dmMap[userId];
+                for (const roomId of roomIds) {
+                    const room = this.matrixClient.getRoom(roomId);
+                    if (!room) {
+                        console.warn(`${roomId} was found in DMs but the room is not in the store`);
+                        continue;
+                    }
+
+                    // We expect this RoomUpdateCause to no-op if there's no change, and we don't expect
+                    // the user to have hundreds of rooms to update in one event. As such, we just hammer
+                    // away at updates until the problem is solved. If we were expecting more than a couple
+                    // of rooms to be updated at once, we would consider batching the rooms up.
+                    await this.handleRoomUpdate(room, RoomUpdateCause.PossibleTagChange);
+                }
+            }
         } else if (payload.action === 'MatrixActions.Room.myMembership') {
-            // TODO: Improve new room check
             const membershipPayload = (<any>payload); // TODO: Type out the dispatcher types
-            if (!membershipPayload.oldMembership && membershipPayload.membership === "join") {
+            if (membershipPayload.oldMembership !== "join" && membershipPayload.membership === "join") {
                 console.log(`[RoomListDebug] Handling new room ${membershipPayload.room.roomId}`);
                 await this.algorithm.handleRoomUpdate(membershipPayload.room, RoomUpdateCause.NewRoom);
+                return;
             }
 
-            // TODO: Update room from membership change
-            console.log(payload);
-        } else if (payload.action === 'MatrixActions.Room') {
-            // TODO: Improve new room check
-            // const roomPayload = (<any>payload); // TODO: Type out the dispatcher types
-            // console.log(`[RoomListDebug] Handling new room ${roomPayload.room.roomId}`);
-            // await this.algorithm.handleRoomUpdate(roomPayload.room, RoomUpdateCause.NewRoom);
+            // If it's not a join, it's transitioning into a different list (possibly historical)
+            if (membershipPayload.oldMembership !== membershipPayload.membership) {
+                console.log(`[RoomListDebug] Handling membership change in ${membershipPayload.room.roomId}`);
+                await this.algorithm.handleRoomUpdate(membershipPayload.room, RoomUpdateCause.PossibleTagChange);
+                return;
+            }
         } else if (payload.action === 'view_room') {
             // TODO: Update sticky room
             console.log(payload);

src/stores/room-list/algorithms/list-ordering/ImportanceAlgorithm.ts

@@ -189,6 +189,13 @@ export class ImportanceAlgorithm extends Algorithm {
     }
 
     public async handleRoomUpdate(room: Room, cause: RoomUpdateCause): Promise<boolean> {
+        if (cause === RoomUpdateCause.PossibleTagChange) {
+            // TODO: Be smarter and splice rather than regen the planet.
+            // TODO: No-op if no change.
+            await this.setKnownRooms(this.rooms);
+            return;
+        }
+
         if (cause === RoomUpdateCause.NewRoom) {
             // TODO: Be smarter and insert rather than regen the planet.
             await this.setKnownRooms([room, ...this.rooms]);

src/stores/room-list/models.ts

@@ -38,6 +38,7 @@ export type TagID = string | DefaultTagID;
 
 export enum RoomUpdateCause {
     Timeline = "TIMELINE",
-    RoomRead = "ROOM_READ", // TODO: Use this.
+    PossibleTagChange = "POSSIBLE_TAG_CHANGE",
+    ReadReceipt = "READ_RECEIPT",
     NewRoom = "NEW_ROOM",
 }