Smooth scroll when the "n new posts" view button is clicked.

Clover/app/src/main/java/org/floens/chan/ui/layout/ThreadLayout.java

@@ -409,7 +409,7 @@ public class ThreadLayout extends CoordinatorLayout implements ThreadPresenter.T
                 newPostsNotification.setAction(R.string.thread_new_posts_goto, new OnClickListener() {
                     @Override
                     public void onClick(View v) {
-                        presenter.scrollTo(-1, false);
+                        presenter.scrollTo(-1, true);
                     }
                 }).show();
                 fixSnackbarText(getContext(), newPostsNotification);

Clover/app/src/main/java/org/floens/chan/ui/layout/ThreadListLayout.java

@@ -356,10 +356,16 @@ public class ThreadListLayout extends LinearLayout implements ReplyLayout.ReplyL
 
     public void scrollTo(int displayPosition, boolean smooth) {
         if (displayPosition < 0) {
+            int bottom = postAdapter.getItemCount() - 1;
+            int difference = Math.abs(bottom - getTopAdapterPosition());
+            if (difference > MAX_SMOOTH_SCROLL_DISTANCE) {
+                smooth = false;
+            }
+
             if (smooth) {
-                recyclerView.smoothScrollToPosition(postAdapter.getItemCount() - 1);
+                recyclerView.smoothScrollToPosition(bottom);
             } else {
-                recyclerView.scrollToPosition(postAdapter.getItemCount() - 1);
+                recyclerView.scrollToPosition(bottom);
             }
         } else {
             int scrollPosition = postAdapter.getScrollPosition(displayPosition);