change: Minor design improvements

lib/views/archive.dart

@@ -17,28 +17,12 @@ class _ArchiveState extends State<Archive> {
     return await Matrix.of(context).client.archive;
   }
 
-  final ScrollController _scrollController = ScrollController();
-  bool _scrolledToTop = true;
-
-  @override
-  void initState() {
-    _scrollController.addListener(() async {
-      if (_scrollController.position.pixels > 0 && _scrolledToTop) {
-        setState(() => _scrolledToTop = false);
-      } else if (_scrollController.position.pixels == 0 && !_scrolledToTop) {
-        setState(() => _scrolledToTop = true);
-      }
-    });
-    super.initState();
-  }
-
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         leading: BackButton(),
         title: Text(L10n.of(context).archive),
-        elevation: _scrolledToTop ? 0 : null,
       ),
       body: FutureBuilder<List<Room>>(
         future: getArchive(context),
@@ -48,7 +32,6 @@ class _ArchiveState extends State<Archive> {
           } else {
             archive = snapshot.data;
             return ListView.builder(
-              controller: _scrollController,
               itemCount: archive.length,
               itemBuilder: (BuildContext context, int i) => ChatListItem(
                   archive[i],