Fix load more

lib/l10n/intl_de.arb

@@ -679,6 +679,11 @@
     "type": "text",
     "placeholders": {}
   },
+  "Load more...": "Lade mehr ...",
+  "@Load more...": {
+    "type": "text",
+    "placeholders": {}
+  },
   "loadCountMoreParticipants": "{count} weitere Teilnehmer laden",
   "@loadCountMoreParticipants": {
     "type": "text",

lib/l10n/intl_messages.arb

@@ -1,5 +1,5 @@
 {
-  "@@last_modified": "2020-05-09T11:48:21.714805",
+  "@@last_modified": "2020-05-09T12:56:54.540935",
   "About": "About",
   "@About": {
     "type": "text",

lib/l10n/messages_de.dart

@@ -227,6 +227,7 @@ class MessageLookup extends MessageLookupByLibrary {
     "Left the chat" : MessageLookupByLibrary.simpleMessage("Hat den Chat verlassen"),
     "License" : MessageLookupByLibrary.simpleMessage("Lizenz"),
     "Light" : MessageLookupByLibrary.simpleMessage("Hell"),
+    "Load more..." : MessageLookupByLibrary.simpleMessage("Lade mehr ..."),
     "Loading... Please wait" : MessageLookupByLibrary.simpleMessage("Lade ... Bitte warten"),
     "Login" : MessageLookupByLibrary.simpleMessage("Login"),
     "Logout" : MessageLookupByLibrary.simpleMessage("Logout"),

lib/views/chat.dart

@@ -456,7 +456,7 @@ class _ChatState extends State<_Chat> {
                           controller: _scrollController,
                           itemBuilder: (BuildContext context, int i) {
                             return i == timeline.events.length + 1
-                                ? _canLoadMore
+                                ? _canLoadMore && !_loadingHistory
                                     ? FlatButton(
                                         child: Text(
                                           L10n.of(context).loadMore,