Fullscreen QDialog with many QLineEdits: background application visible on split view after focused QLineEdit changed

Preconditions:

Fullscreen QDialogs includes many QLineEdits.

• pvkb-addressbook test application used: open application --> on default screen can be seen 9 QLineEdits on QDialog.

Test steps:
1. Tap the QLineEdit on bottom of screen ('Field 9' on pvkb-addressbook test application).
--> split view opens and focused QLineEdit is visible.
2. Change the focused item one by one upwards.
3. When the topmost QLineEdit on split view screen area has the focus ('Field 3' on test application), start changing the focus one by one upwards.

Expected result:
Focused text input field is correctly visible on split view.

Actual result:
Background application comes visible to split view screen area.