GraphicsView without scrollbars: view position changes on split view screen area

Preconditions:
QGraphicsWebView includes url input box and some HTML content.
View is on portrait orientation.
Tested with pvkb-addressbook test application:

• select 'GWeb' and set scrollbars off
• select 'drag-drop edit' (or 'Big Textarea')

Test steps:
1. Tap some text input field, e.g. 'Panda'
-> split view is opened with qwerty virtual keyboard
2. Select 'Insert symbol' from virtual keyboard options menu
-> symbol table comes to foreground
3. Select some symbol

Expected result:
Symbol table is closed and text widgets are visible on split view screen area as they were before opening the symbol table.

Actual result:
Symbol table is closed. View content has moved upwards on split view screen area. If symbol table is opened and closed again, view content moves again bit upwards. View is correctly displayed if e.g. lock/unlock keys are pressed.
Note: error can also be reproduced if orientation is switched: portrait-landscape-portrait and after that virtual keyboard mode is changed.