Fix suw display size flicker problem

- Swipe the preview area will invoke the OnGlobalLayoutListener.
- Sometime it cause a flicker when scroll view scrolling up and
  preivew area swiping.
- It is no need to scroll up if the height of scroll view does not change.

Fixes: 205918748
Test: manual test
Change-Id: I8ed5454d32f0cf2a7bc3bac45c7aa054ce929c4b