QTabWidget: QWidget position changes & background application visible on split view after focus change

Preconditions:

Application includes QTabWidget with many QWidgets on one tab.
QWidgets are at bottom of the tab (completely outside the split view area). Tested with tab that includes 3 QLineEdits.
Split view is open on portrait mode and the first QLineEdit has focus.

Test steps:
1. Tap the second QLineEdit while split view is open.

Expected result:
Focus is moved to tapped QLineEdit and the position of 3 QLineEdits is not changed on split view screen area.

Actual result:
Focus is moved to tapped QLineEdit. All 3 QLineEdits move one 'step' up on split view screen area and the background application is visible in the small area above the virtual keyboard. This happens again if the focus is moved.
Note: if user locks/unlocks keys the QLineEdits are again correctly displayed (position ok + no background application visible) on split view screen area.