If the user uses a scroll box and then get the offset of the scroll box it will read correctly until the user uses the mouse wheel to scroll down. The scroll offset will then read lower than the actual offset.

Steps to Reproduce
  1. Open Editor
  2. Create New widget Blueprint
  3. Add a Scroll box to the designer tab
  4. Make the Scroll Box a Variable
  5. Add a Text Box (Multi-Line) to the scroll box
  6. Create blueprint in attached image
  7. Open level blueprint
  8. Add the new widget blueprint to the viewport
  9. Play In Editor
  10. Add Text to the Text box until is starts to scroll
  11. Make note of the number that is printed out
  12. Place mouse over the scroll box and use the mouse wheel to scroll down
  13. Notice that the number in the print string (scroll offset) has gone down but the scroll box did not actually scroll

Expected: The offset would only change when scroll box has actually scrolled
Result: The Scroll offset changes even though the scroll box has not scrolled

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ComponentUE - Editor - UI Systems
Affects Versions4.9
Target Fix4.12
Fix Commit2959894
Main Commit2973886
Release Commit2971054
CreatedSep 2, 2015
ResolvedApr 28, 2016
UpdatedJun 23, 2016
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