It's not clear why, but the combination of a word-wrapped QLabel with
the `setFocusPolicy()` call in `overrideFocusPolicyOf()` seems to break
the positioning of the groupbox in its parent layout.
Until we understand where the bug is and how to fix it, we can toggle
the groupbox twice when we detect that a QLabel with word-wrapping
enabled has been added as child. Not clear why (again), but this fixes
(or at least hides) the issue.