GF-58769: Secure scroll threshold for 5-way key moving

When we use 5-way key to move next control in DataList,
It scrolls as much as childSize.
So, if we just have space like childSize for threshold[upperProp], page
adjusting does not occur properly.

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com
GF-58769: Update scroll position after it actually scrolled.

didScroll() means scroller actually scrolled.
When didScroll() is called, scrollBounds should be updated.
However,  scrollBounds is not updated yet at this point.

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com
Revert "GF-58769: Secure scroll threshold for 5-way key moving"

This reverts commit 2f52419bc1e5d146d4e9a077555d6fe7a2851736.
Merge pull request #642 from DavidUM/GF-58769-davidum

Gf 58769 Fix page positioning related logic.

Reviewed-By: Ben Combee (ben.combee@lge.com)