Recreate All of the view holders on load more

I added a header on top of list, After loading new page all of the items recreate so every time i seen header for just a second then scroll to correct position

Reproduce the issue in the Jetpack Paging codelab by adding a header and loading another page. Inspect the list and paging entry points involved in loading more items, then verify that existing view holders are not unnecessarily recreated and that the header remains stable after loading.

Written by the indexing model from the issue text.