PlaceHolder not removed when scroll from top and anhor is bottom

Hi
After scroll placeHolder not removed and i did hotFix this by editing row 294

``` js
function unStickElement(fromDirection) {
...
if (placeholder && fromDirection != anchor) {   /*## if (placeholder && fromDirection === anchor) { ##*/
...
}
```

if it's wrong please answer. 
Thank you for attention
