Added warning when reaching conversation length limit of 200 messages

lib/api/marianumcloud/talk/chat/getChatResponse.dart

@@ -61,19 +61,22 @@ class GetChatResponseObject {
 
   static GetChatResponseObject getDateDummy(int timestamp) {
     DateTime elementDate = DateTime.fromMillisecondsSinceEpoch(timestamp * 1000);
+    return getTextDummy(Jiffy.parseFromDateTime(elementDate).format(pattern: "dd.MM.yyyy"));
+  }
 
+  static GetChatResponseObject getTextDummy(String text) {
     return GetChatResponseObject(
         0,
         "",
         GetRoomResponseObjectMessageActorType.user,
         "",
         "",
-        timestamp,
+        0,
-        elementDate.toIso8601String(),
+        "",
         GetRoomResponseObjectMessageType.system,
         false,
         "",
-        Jiffy.parseFromDateTime(elementDate).format(pattern: "dd.MM.yyyy"),
+        text,
         null,
         null,
         null

lib/view/pages/talk/chatView.dart

@@ -74,6 +74,19 @@ class _ChatViewState extends State<ChatView> {
               )
             );
           });
+
+          if(data.getChatResponse.data.length >= 200) {
+            messages.insert(0, ChatBubble(
+              context: context,
+              isSender: false,
+              bubbleData: GetChatResponseObject.getTextDummy(
+                  "Zurzeit können in dieser App nur die letzten 200 vergangenen Nachrichten angezeigt werden. "
+                  "Um ältere Nachrichten abzurufen verwende die Webversion unter https://cloud.marianum-fulda.de"
+              ),
+              chatData: widget.room,
+              refetch: _query,
+            ));
+          }
         }
 
         return Scaffold(