Prevent flicker

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -1398,13 +1398,12 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
                     @Override
                     public boolean onTouchEvent(MotionEvent event) {
-                        if (event.getPointerCount() == 2)
-                            getParent().requestDisallowInterceptTouchEvent(true); // zoom
-                        else if (event.getAction() == MotionEvent.ACTION_MOVE) {
+                        if (event.getPointerCount() == 1) {
                             int range = computeVerticalScrollRange() - computeVerticalScrollExtent();
                             if (range > 0) // scroll
                                 getParent().requestDisallowInterceptTouchEvent(true);
-                        }
+                        } else // zoom
+                            getParent().requestDisallowInterceptTouchEvent(true);
                         return super.onTouchEvent(event);
                     }
 
@@ -1419,8 +1418,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     @Override
                     protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
                         super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
-                        if (clampedY)
-                            properties.scrollBy(0, dy);
+                        if (clampedY) {
+                            int range = computeVerticalScrollRange() - computeVerticalScrollExtent();
+                            if (range > 0) // This is to prevent flicker
+                                properties.scrollBy(0, dy);
+                        }
                     }
                 };