NullSafety: Migrate more Ui widgets

lib/ui/payment/skip_subscription_widget.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'package:flutter/material.dart';
 import 'package:photos/core/event_bus.dart';
 import 'package:photos/events/subscription_purchased_event.dart';
@@ -10,8 +8,8 @@ import 'package:photos/ui/home_widget.dart';
 
 class SkipSubscriptionWidget extends StatelessWidget {
   const SkipSubscriptionWidget({
-    Key key,
-    @required this.freePlan,
+    Key? key,
+    required this.freePlan,
   }) : super(key: key);
 
   final FreePlan freePlan;
@@ -24,10 +22,10 @@ class SkipSubscriptionWidget extends StatelessWidget {
       margin: const EdgeInsets.fromLTRB(0, 30, 0, 0),
       padding: const EdgeInsets.fromLTRB(20, 0, 20, 0),
       child: OutlinedButton(
-        style: Theme.of(context).outlinedButtonTheme.style.copyWith(
+        style: Theme.of(context).outlinedButtonTheme.style?.copyWith(
           textStyle: MaterialStateProperty.resolveWith<TextStyle>(
             (Set<MaterialState> states) {
-              return Theme.of(context).textTheme.subtitle1;
+              return Theme.of(context).textTheme.subtitle1!;
             },
           ),
         ),

lib/ui/payment/subscription.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'package:flutter/cupertino.dart';
 import 'package:photos/core/configuration.dart';
 import 'package:photos/services/feature_flag_service.dart';
@@ -24,5 +22,5 @@ StatefulWidget getSubscriptionPage({bool isOnBoarding = false}) {
 // users who might have paid via playStore. This method should be removed once
 // we have better handling for active play/app store subscription & stripe plans.
 bool _isUserCreatedPostStripeSupport() {
-  return Configuration.instance.getUserID() > 1580559962386460;
+  return Configuration.instance.getUserID()! > 1580559962386460;
 }

lib/ui/sharing/share_collection_page.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'package:collection/collection.dart';
 import 'package:fast_base58/fast_base58.dart';
 import 'package:flutter/material.dart';
@@ -25,14 +23,14 @@ import 'package:photos/utils/toast_util.dart';
 class ShareCollectionPage extends StatefulWidget {
   final Collection collection;
 
-  const ShareCollectionPage(this.collection, {Key key}) : super(key: key);
+  const ShareCollectionPage(this.collection, {Key? key}) : super(key: key);
 
   @override
   State<ShareCollectionPage> createState() => _ShareCollectionPageState();
 }
 
 class _ShareCollectionPageState extends State<ShareCollectionPage> {
-  List<User> _sharees;
+  late List<User?> _sharees;
   final Logger _logger = Logger("SharingDialogState");
   final CollectionActions collectionActions =
       CollectionActions(CollectionsService.instance);
@@ -132,7 +130,7 @@ class _ShareCollectionPageState extends State<ShareCollectionPage> {
           CollectionsService.instance.getCollectionKey(widget.collection.id),
         );
         final String url =
-            "${widget.collection.publicURLs.first.url}#$collectionKey";
+            "${widget.collection.publicURLs!.first!.url}#$collectionKey";
         children.addAll(
           [
             MenuItemWidget(
@@ -235,8 +233,8 @@ class _ShareCollectionPageState extends State<ShareCollectionPage> {
     return Scaffold(
       appBar: AppBar(
         title: Text(
-          widget.collection.name,
-          style: Theme.of(context).textTheme.headline5.copyWith(fontSize: 16),
+          widget.collection.name ?? "Unnamed",
+          style: Theme.of(context).textTheme.headline5?.copyWith(fontSize: 16),
         ),
         elevation: 0,
         centerTitle: false,
@@ -260,12 +258,12 @@ class _ShareCollectionPageState extends State<ShareCollectionPage> {
 
 class EmailItemWidget extends StatelessWidget {
   final Collection collection;
-  final Function onTap;
+  final Function? onTap;
 
   const EmailItemWidget(
     this.collection, {
     this.onTap,
-    Key key,
+    Key? key,
   }) : super(key: key);
 
   @override
@@ -291,7 +289,7 @@ class EmailItemWidget extends StatelessWidget {
             trailingIcon: Icons.chevron_right,
             onTap: () async {
               if (onTap != null) {
-                onTap();
+                onTap!();
               }
             },
             isBottomBorderRadiusRemoved: true,
@@ -317,7 +315,7 @@ class EmailItemWidget extends StatelessWidget {
             trailingIcon: Icons.chevron_right,
             onTap: () async {
               if (onTap != null) {
-                onTap();
+                onTap!();
               }
             },
             isBottomBorderRadiusRemoved: true,

lib/ui/viewer/search/result/no_result_widget.dart

@@ -1,10 +1,8 @@
-// @dart=2.9
-
 import 'package:flutter/material.dart';
 import 'package:photos/ente_theme_data.dart';
 
 class NoResultWidget extends StatelessWidget {
-  const NoResultWidget({Key key}) : super(key: key);
+  const NoResultWidget({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {