QGraphicsViews: very visible flickering when split view is opened

Preconditions:

Application includes QGraphicsView with some QWidget content. View is on portrait orientation.

• tested with 'GraphicsLayoutTest' test application but note: error can be reproduced with all graphics view test applications (e.g. 'Graphics Test', 'TestGTI').
• from GraphicsLayoutTest: select e.g. Grid layout

Test steps:
1. Tap some of the text input fields on screen, e.g. QTextEdit or QDateTimeEdit. After split view has been opened, close it and open again few times.

Expected result:
Split view is opened without flickering.

Actual result:
Split view is opened but split view screen is flickering (very visible for end user). Error can be reproduce with all widget positions & layouts.