Fix visual glitches, appearing from time to time

Author: rubengees

app/src/main/java/com/proxerme/app/adapter/ConferenceAdapter.java

@@ -72,6 +72,10 @@ public int insertAtStart(@NonNull List<Conference> list) {
             currentPos++;
         }
 
+        if (currentPos > 0) {
+            notifyItemRangeChanged(0, currentPos);
+        }
+
         return result;
     }
 

app/src/main/java/com/proxerme/app/fragment/PagingFragment.java

@@ -208,8 +208,6 @@ private void handleResult(List<T> result, boolean insert) {
         } else {
             adapter.append(result);
         }
-
-        adapter.notifyDataSetChanged();
     }
 
     private void showError() {