[FIX] layout/Splitter: Disable auto-resize during live-resize

When auto-resize and live-resize was activated at the same time,
auto-resize could fire during the time when the user dragged the
bar, which lead to wrong content sizes during the drag-operation.
This fix temporarily disables auto-resize during live-resize.

CSS: 0120031469 0000777225 2014
Change-Id: I1b2e01474216b53eb7dd388abc3af17bc64d9256
Merge "[FIX] layout/Splitter: Disable auto-resize during live-resize"