QGraphicsWidget: background application visible at the bottom of split view screen area

Preconditions:

Application has fullscreen QGraphicsWidget with many QLineEdits (tested with pvkb-addressbook webkit-test application).
Application is on portrait mode and includes a scrollbar. View is scrolled up.

Test steps:
1. Tap the QLineEdit that fits into split view screen area.

Expected result:
Split view is correctly opened.

Actual result:
Split view is opened. Background application can be seen on horizontal area at the bottom of split view screen.