chore: Enhance invitiation UX

integration_test/app_test.dart

@@ -26,7 +26,6 @@ void main() {
       await tester.pumpAndSettle();
 
       expect(find.text('Connect'), findsOneWidget);
-      expect(find.text('Homeserver'), findsOneWidget);
 
       final input = find.byType(TextField);
 

lib/pages/chat_list/chat_list_body.dart

@@ -180,11 +180,12 @@ class _ChatListViewBodyState extends State<ChatListViewBody> {
                                 .onSecondaryContainer,
                           ),
                           title: Text(
-                            Matrix.of(context)
-                                    .client
-                                    .encryption!
-                                    .keyManager
-                                    .enabled
+                            (Matrix.of(context)
+                                        .client
+                                        .encryption
+                                        ?.keyManager
+                                        .enabled ==
+                                    true)
                                 ? L10n.of(context)!.unlockOldMessages
                                 : L10n.of(context)!.enableAutoBackups,
                             style: TextStyle(

lib/pages/invitation_selection/invitation_selection.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 
+import 'package:adaptive_dialog/adaptive_dialog.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:future_loading_dialog/future_loading_dialog.dart';
 import 'package:matrix/matrix.dart';
@@ -50,10 +51,19 @@ class InvitationSelectionController extends State<InvitationSelection> {
   }
 
   void inviteAction(BuildContext context, String id) async {
-    final room = Matrix.of(context).client.getRoomById(roomId!);
+    final room = Matrix.of(context).client.getRoomById(roomId!)!;
+    if (OkCancelResult.ok !=
+        await showOkCancelAlertDialog(
+          context: context,
+          title: L10n.of(context)!.inviteContactToGroup(room.displayname),
+          okLabel: L10n.of(context)!.yes,
+          cancelLabel: L10n.of(context)!.cancel,
+        )) {
+      return;
+    }
     final success = await showFutureLoadingDialog(
       context: context,
-      future: () => room!.invite(id),
+      future: () => room.invite(id),
     );
     if (success.error == null) {
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(

lib/pages/invitation_selection/invitation_selection_view.dart

@@ -32,7 +32,14 @@ class InvitationSelectionView extends StatelessWidget {
           autofocus: true,
           decoration: InputDecoration(
             hintText: L10n.of(context)!.inviteContactToGroup(groupName),
-            suffix: const Icon(Icons.search_outlined),
+            suffixIconConstraints: const BoxConstraints(
+              maxWidth: 48,
+              maxHeight: 48,
+              minWidth: 48,
+            ),
+            suffixIcon: controller.loading
+                ? const CircularProgressIndicator.adaptive()
+                : const Icon(Icons.search_outlined),
             contentPadding: const EdgeInsets.symmetric(horizontal: 16),
           ),
           onChanged: controller.searchUserWithCoolDown,