fix to mark federated rooms as read

As lastMessageId is not available for federatedRooms, the API on server side now allows the messageID to be optional. This is done by this commit: messageId is null when it's a federated room.

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/api/NcApi.java

@@ -552,7 +552,7 @@ public interface NcApi {
     @POST
     Observable<GenericOverall> setChatReadMarker(@Header("Authorization") String authorization,
                                                  @Url String url,
-                                                 @Field("lastReadMessage") int lastReadMessage);
+                                                 @Nullable @Field("lastReadMessage") Integer lastReadMessage);
 
     // Url is: /api/{apiVersion}/chat/{token}/read
     @DELETE

app/src/main/java/com/nextcloud/talk/ui/dialog/ConversationsListBottomDialog.kt

@@ -308,6 +308,12 @@ class ConversationsListBottomDialog(
     }
 
     private fun markConversationAsRead() {
+        val messageId = if (conversation.remoteServer.isNullOrEmpty()) {
+            conversation.lastMessage!!.jsonMessageId
+        } else {
+            null
+        }
+
         ncApi.setChatReadMarker(
             credentials,
             ApiUtils.getUrlForChatReadMarker(
@@ -315,7 +321,7 @@ class ConversationsListBottomDialog(
                 currentUser.baseUrl!!,
                 conversation.token!!
             ),
-            conversation.lastMessage!!.jsonMessageId
+            messageId
         )
             .subscribeOn(Schedulers.io())
             .observeOn(AndroidSchedulers.mainThread())
@@ -360,6 +366,7 @@ class ConversationsListBottomDialog(
             )
         }
     }
+
     private fun leaveConversation() {
         val dataBuilder = Data.Builder()
         dataBuilder.putString(KEY_ROOM_TOKEN, conversation.token)