Minor fixes

lib/components/matrix.dart

@@ -51,7 +51,16 @@ class MatrixState extends State<Matrix> {
   FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
   FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
       FlutterLocalNotificationsPlugin();
-  Map<String, dynamic> shareContent;
+  Map<String, dynamic> get shareContent => _shareContent;
+  set shareContent(Map<String, dynamic> content) {
+    _shareContent = content;
+    onShareContentChanged.add(_shareContent);
+  }
+
+  Map<String, dynamic> _shareContent;
+
+  final StreamController<Map<String, dynamic>> onShareContentChanged =
+      StreamController.broadcast();
 
   String activeRoomId;
   File wallpaper;

lib/views/chat.dart

@@ -373,7 +373,7 @@ class _ChatState extends State<_Chat> {
         title: selectedEvents.isEmpty
             ? Column(
                 mainAxisSize: MainAxisSize.min,
-                crossAxisAlignment: Platform.isIOS
+                crossAxisAlignment: !kIsWeb && Platform.isIOS
                     ? CrossAxisAlignment.center
                     : CrossAxisAlignment.start,
                 children: <Widget>[

lib/views/chat_list.dart

@@ -125,7 +125,6 @@ class _ChatListState extends State<ChatList> {
         path: file.path,
       ),
     };
-    setState(() => null);
   }
 
   void _processIncomingSharedText(String text) {
@@ -141,7 +140,6 @@ class _ChatListState extends State<ChatList> {
       "msgtype": "m.text",
       "body": text,
     };
-    setState(() => null);
   }
 
   void _initReceiveSharingINtent() {
@@ -170,11 +168,18 @@ class _ChatListState extends State<ChatList> {
     );
     _intentDataStreamSubscription?.cancel();
     _intentFileStreamSubscription?.cancel();
+    _onShareContentChangedSub?.cancel();
     super.dispose();
   }
 
+  StreamSubscription _onShareContentChangedSub;
+
   @override
   Widget build(BuildContext context) {
+    _onShareContentChangedSub ??= Matrix.of(context)
+        .onShareContentChanged
+        .stream
+        .listen((c) => setState(() => null));
     if (Matrix.of(context).shareContent != null) {
       selectMode = SelectMode.share;
     } else if (selectMode == SelectMode.share) {