Fix Android autofill navigation screen bug

New entry to save was sometimes not the top screen on the navigation stack.

Could also lead to crashes if user interacted with the top-level screen,
depending upon what that screen was.

lib/widgets/entry_list.dart

@@ -7,6 +7,7 @@ import 'package:keevault/cubit/autofill_cubit.dart';
 import 'package:keevault/cubit/entry_cubit.dart';
 import 'package:keevault/cubit/filter_cubit.dart';
 import 'package:keevault/cubit/sort_cubit.dart';
+import 'package:keevault/logging/logger.dart';
 import 'package:keevault/model/entry.dart';
 import 'package:keevault/widgets/entry.dart';
 import 'package:keevault/widgets/in_app_messenger.dart';
@@ -277,6 +278,10 @@ class EntryListItemWidget extends StatelessWidget {
                       );
                     },
                     onClosed: (bool? keepChanges) async {
+                      if (!context.mounted) {
+                        l.e("context not mounted so we can't tidy up or save the entry. Presumably something happened to make the underlying Vault go away, such as autofill save entry screen replacing the main vault.");
+                        return;
+                      }
                       final entryCubit = BlocProvider.of<EntryCubit>(context);
                       final iam = InAppMessengerWidget.of(context);
                       if ((keepChanges == null || keepChanges) && (entryCubit.state as EntryLoaded).entry.isDirty) {

lib/widgets/vault.dart

@@ -121,7 +121,7 @@ class _VaultWidgetState extends State<VaultWidget> with WidgetsBindingObserver {
   @override
   Widget build(BuildContext context) {
     final str = S.of(context);
-    return BlocBuilder<AutofillCubit, AutofillState>(
+    return BlocConsumer<AutofillCubit, AutofillState>(
       builder: (context, autofillState) {
         return BlocConsumer<VaultCubit, VaultState>(
             buildWhen: (previous, current) => current is VaultLoaded,
@@ -180,6 +180,14 @@ class _VaultWidgetState extends State<VaultWidget> with WidgetsBindingObserver {
               }
             });
       },
+      listener: (BuildContext context, AutofillState state) {
+        if (state is AutofillSaving) {
+          l.d('Popping until top level reached');
+          AppConfig.navigatorKey.currentState?.popUntil((r) {
+            return r.isFirst;
+          });
+        }
+      },
     );
   }
 }