Set lastViewed on initial load

Clover/app/src/main/java/org/floens/chan/core/presenter/ThreadPresenter.java

@@ -229,15 +229,18 @@ public class ThreadPresenter implements ChanLoader.ChanLoaderCallback, PostAdapt
 
         if (loadable.isThreadMode()) {
             int postsSize = result.posts.size();
+
+            if (loadable.lastViewed < 0) {
+                loadable.lastViewed = result.posts.get(result.posts.size() - 1).no;
+            }
+
             if (notificationPostCount < 0) {
                 notificationPostCount = postsSize;
-            } else {
-                if (postsSize > notificationPostCount) {
-                    int more = postsSize - notificationPostCount;
-                    notificationPostCount = postsSize;
+            } else if (postsSize > notificationPostCount) {
+                int more = postsSize - notificationPostCount;
+                notificationPostCount = postsSize;
 
-                    threadPresenterCallback.showNewPostsNotification(true, more);
-                }
+                threadPresenterCallback.showNewPostsNotification(true, more);
             }
         }