Fix issues with jumpToMessage behavior.

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java

@@ -1005,7 +1005,7 @@ public class ConversationFragment extends LoggingFragment {
 
   private void moveToPosition(int position, @Nullable Runnable onMessageNotFound) {
     Log.d(TAG, "moveToPosition(" + position + ")");
-    conversationViewModel.onConversationDataAvailable(threadId, position);
+    conversationViewModel.getPagingController().onDataNeededAroundIndex(position);
     snapToTopDataObserver.buildScrollPosition(position)
                          .withOnPerformScroll(((layoutManager, p) ->
                              list.post(() -> {

app/src/main/java/org/thoughtcrime/securesms/util/SnapToTopDataObserver.java

@@ -127,6 +127,7 @@ public class SnapToTopDataObserver extends RecyclerView.AdapterDataObserver {
     }
 
     if (layoutManager.findFirstVisibleItemPosition() == 0) {
+      Log.d(TAG, "Scrolling to top.");
       scrollToTop.scrollToTop();
     }
   }