Dropdown Menu not displayed correctly after style change

[hellerve]

Under some conditions, namely after changing the applications' style and accepting without closing the settings window, the settings windows' dropdown menus are not displayed correctly. The issue stays even after redrawing and updating the window. It vanishes when the settings window is closed and openend again and is not reproducible afterwards.

[hellerve]

I fear that this might be a Qt issue and will consider opening a Qt issue after some testing and hacking together a minimal example.