"Preserves the scroll on refresh" does not ensure first item visibility

When the first item in list is partially visible, refreshing the page causes scrolling to the first item entirely visible.
For example, when using [https://rawgit.com/angular-ui/ui-scroll/master/demo/persistentScroll/persistentScroll.html](url), we can make "Item 2" as the first item (not entirely visible):
Then refreshing the page, makes "Item 3" the first item:
while the expected behavior would be to still see "Item 2" as in:

This is even more important when items in list have a "big height".

Any idea on how to solve this?

Thanks in advance,

Olivier