fix bug where the wrong left panel tile is removed when accepting invite

because when comparing a tile to itself it wasn't returned 0

src/domain/session/leftpanel/BaseTileViewModel.js

@@ -18,7 +18,7 @@ limitations under the License.
 import {avatarInitials, getIdentifierColorNumber, getAvatarHttpUrl} from "../../avatar.js";
 import {ViewModel} from "../../ViewModel.js";
 
-const KIND_ORDER = ["invite", "room"];
+const KIND_ORDER = ["roomBeingCreated", "invite", "room"];
 
 export class BaseTileViewModel extends ViewModel {
     constructor(options) {

src/domain/session/leftpanel/InviteTileViewModel.js

@@ -1,5 +1,4 @@
 /*
-Copyright 2020 Bruno Windels <bruno@windels.cloud>
 Copyright 2020, 2021 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
@@ -16,6 +15,7 @@ limitations under the License.
 */
 
 import {BaseTileViewModel} from "./BaseTileViewModel.js";
+import {comparePrimitive} from "./common";
 
 export class InviteTileViewModel extends BaseTileViewModel {
     constructor(options) {
@@ -34,6 +34,9 @@ export class InviteTileViewModel extends BaseTileViewModel {
     get badgeCount() { return this.i18n`!`; }
     get _avatarSource() { return this._invite; }
 
+    /** very important that sorting order is stable and that comparing
+     * to itself always returns 0, otherwise SortedMapList will
+     * remove the wrong children, etc ... */
     compare(other) {
         const parentComparison = super.compare(other);
         if (parentComparison !== 0) {
@@ -43,6 +46,19 @@ export class InviteTileViewModel extends BaseTileViewModel {
         if (timeDiff !== 0) {
             return timeDiff;
         }
-        return this._invite.id < other._invite.id ? -1 : 1;
+        return comparePrimitive(this._invite.id, other._invite.id);
+    }
+}
+
+export function tests() {
+    return {
+        "test compare with timestamp": assert => {
+            const urlCreator = {openRoomActionUrl() { return "";}}
+            const vm1 = new InviteTileViewModel({invite: {timestamp: 500, id: "1"}, urlCreator});
+            const vm2 = new InviteTileViewModel({invite: {timestamp: 250, id: "2"}, urlCreator});
+            assert(vm1.compare(vm2) < 0);
+            assert(vm2.compare(vm1) > 0);
+            assert.equal(vm1.compare(vm1), 0);
+        },
     }
 }

src/domain/session/leftpanel/RoomBeingCreatedTileViewModel.js

@@ -16,6 +16,7 @@ limitations under the License.
 */
 
 import {BaseTileViewModel} from "./BaseTileViewModel.js";
+import {comparePrimitive} from "./common";
 
 export class RoomBeingCreatedTileViewModel extends BaseTileViewModel {
     constructor(options) {
@@ -33,12 +34,20 @@ export class RoomBeingCreatedTileViewModel extends BaseTileViewModel {
     get name() { return this._roomBeingCreated.name; }
     get _avatarSource() { return this._roomBeingCreated; }
 
+    /** very important that sorting order is stable and that comparing
+     * to itself always returns 0, otherwise SortedMapList will
+     * remove the wrong children, etc ... */
     compare(other) {
-        const parentComparison = super.compare(other);
-        if (parentComparison !== 0) {
-            return parentComparison;
+        const parentCmp = super.compare(other);
+        if (parentCmp !== 0) {
+            return parentCmp;
+        }
+        const nameCmp = comparePrimitive(this.name, other.name);
+        if (nameCmp === 0) {
+            return comparePrimitive(this._roomBeingCreated.id, other._roomBeingCreated.id);
+        } else {
+            return nameCmp;
         }
-        return other._roomBeingCreated.name.localeCompare(this._roomBeingCreated.name);
     }
 
     avatarUrl(size) {
@@ -46,3 +55,16 @@ export class RoomBeingCreatedTileViewModel extends BaseTileViewModel {
         return this._roomBeingCreated.avatarBlobUrl ?? super.avatarUrl(size);
     }
 }
+
+export function tests() {
+    return {
+        "test compare with names": assert => {
+            const urlCreator = {openRoomActionUrl() { return "";}}
+            const vm1 = new RoomBeingCreatedTileViewModel({roomBeingCreated: {name: "A", id: "1"}, urlCreator});
+            const vm2 = new RoomBeingCreatedTileViewModel({roomBeingCreated: {name: "B", id: "2"}, urlCreator});
+            assert(vm1.compare(vm2) < 0);
+            assert(vm2.compare(vm1) > 0);
+            assert.equal(vm1.compare(vm1), 0);
+        },
+    }
+}

src/domain/session/leftpanel/RoomTileViewModel.js

@@ -33,6 +33,9 @@ export class RoomTileViewModel extends BaseTileViewModel {
         return this._url;
     }
 
+    /** very important that sorting order is stable and that comparing
+     * to itself always returns 0, otherwise SortedMapList will
+     * remove the wrong children, etc ... */
     compare(other) {
         const parentComparison = super.compare(other);
         if (parentComparison !== 0) {

src/domain/session/leftpanel/common.js

@@ -0,0 +1,23 @@
+/*
+Copyright 2020, 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export function comparePrimitive(a, b) {
+    if (a === b) {
+        return 0;
+    } else {
+        return a < b ? -1 : 1;
+    }
+}