QTextEdit/QPlainTextEdit at center/bottom of QDialog: split view corrupted after orientation switch

Preconditions:
QDialog includes a QTextEdit/QPlainTextEdit at bottom or center of dialog screen.
Dialog is on portrait mode and split view is open.

Test steps:
1. Tap the text widget.
-> split view is opened.
2. Switch the orientation from portrait to landscape.

Expected result:
Split view is correctly opened to landscape mode.

Actual result:
Split view displays only part of text widget. Background application is visible on both sides of text widget.