show the homeserver after lookup

src/domain/login/LoginViewModel.js

@@ -49,6 +49,7 @@ export class LoginViewModel extends ViewModel {
     get startSSOLoginViewModel() { return this._startSSOLoginViewModel; }
     get completeSSOLoginViewModel(){ return this._completeSSOLoginViewModel; }
     get homeserver() { return this._homeserver; }
+    get forwardedHomeserver() { return this._loginOptions?.homeserver; }
     get errorMessage() { return this._errorMessage; }
     get showHomeserver() { return !this._hideHomeserver; }
     get loadViewModel() {return this._loadViewModel; }
@@ -203,6 +204,7 @@ export class LoginViewModel extends ViewModel {
             this._abortQueryOperation = this.track(() => queryOperation.abort());
             this.emitChange("isFetchingLoginOptions");
             this._loginOptions = await queryOperation.result;
+            this.emitChange("forwardedHomeserver");
         }
         catch (e) {
             if (e.name === "AbortError") {

src/platform/web/ui/css/themes/element/theme.css

@@ -238,6 +238,12 @@ a.button-action {
     font-size: 1.5rem;
 }
 
+.LoginView_forwardInfo {
+    font-size: 0.9em;
+    margin-left: 1em;
+    color: #777;
+}
+
 .CompleteSSOView_title {
     font-weight: 500;
 }

src/platform/web/ui/login/LoginView.js

@@ -46,6 +46,10 @@ export class LoginView extends TemplateView {
                         onInput: event => vm.setHomeserver(event.target.value),
                         onChange: () => vm.queryHomeserver(),
                     }),
+                    t.p({className: {
+                        LoginView_forwardInfo: true,
+                        hidden: vm => !vm.forwardedHomeserver
+                    }}, vm => vm.i18n`${vm.homeserver} forwards to ${vm.forwardedHomeserver}.`),
                     t.if(vm => vm.errorMessage, (t, vm) => t.p({className: "error"}, vm.i18n(vm.errorMessage))),
                 ]
             )),