always pass options to ViewModel constructor

src/domain/AccountSetupViewModel.js

@@ -19,9 +19,9 @@ import {KeyType} from "../matrix/ssss/index";
 import {Status} from "./session/settings/KeyBackupViewModel.js";
 
 export class AccountSetupViewModel extends ViewModel {
-    constructor(accountSetup) {
-        super();
-        this._accountSetup = accountSetup;
+    constructor(options) {
+        super(options);
+        this._accountSetup = options.accountSetup;
         this._dehydratedDevice = undefined;
         this._decryptDehydratedDeviceViewModel = undefined;
         if (this._accountSetup.encryptedDehydratedDevice) {
@@ -53,7 +53,7 @@ export class AccountSetupViewModel extends ViewModel {
 // this vm adopts the same shape as KeyBackupViewModel so the same view can be reused.
 class DecryptDehydratedDeviceViewModel extends ViewModel {
     constructor(accountSetupViewModel, decryptedCallback) {
-        super();
+        super(accountSetupViewModel.options);
         this._accountSetupViewModel = accountSetupViewModel;
         this._isBusy = false;
         this._status = Status.SetupKey;

src/domain/SessionLoadViewModel.js

@@ -43,7 +43,7 @@ export class SessionLoadViewModel extends ViewModel {
             this.emitChange("loading");
             this._waitHandle = this._client.loadStatus.waitFor(s => {
                 if (s === LoadStatus.AccountSetup) {
-                    this._accountSetupViewModel = new AccountSetupViewModel(this._client.accountSetup);
+                    this._accountSetupViewModel = new AccountSetupViewModel(this.childOptions({accountSetup: this._client.accountSetup}));
                 } else {
                     this._accountSetupViewModel = undefined;
                 }

src/domain/ViewModel.ts

@@ -51,6 +51,8 @@ export class ViewModel<O extends Options = Options> extends EventEmitter<{change
         return Object.assign({}, this._options, explicitOptions);
     }
 
+    get options(): O { return this._options; }
+
     // makes it easier to pass through dependencies of a sub-view model
     getOption<N extends keyof O>(name: N): O[N]  {
         return this._options[name];
@@ -110,7 +112,7 @@ export class ViewModel<O extends Options = Options> extends EventEmitter<{change
     }
 
     emitChange(changedProps: any): void {
-        if (this._options?.emitChange) {
+        if (this._options.emitChange) {
             this._options.emitChange(changedProps);
         } else {
             this.emit("change", changedProps);

src/domain/session/room/ComposerViewModel.js

@@ -18,7 +18,7 @@ import {ViewModel} from "../../ViewModel";
 
 export class ComposerViewModel extends ViewModel {
     constructor(roomVM) {
-        super();
+        super(roomVM.options);
         this._roomVM = roomVM;
         this._isEmpty = true;
         this._replyVM = null;