Split view flashes if insert symbol screen opened from Split view and layout is changed

Preconditions:

Application includes fullscreen QDialog with e.g. QLineEdit.
Split view is open on landscape or portrait mode with qwerty virtual keyboard.

Test steps:
1. select Insert symbol from Split view virtual keyboard.
--> symbol screen is opened.
2. Switch the layout from portrait to landscape (or from landcape to portrait).

Expected result:
Symbol screen layout is changed.

Actual result:
Symbol screen layout is changed and split view is shortly displayed during the layout switch.