When using `egui::ViewportBuilder::with_fullsize_content_view` one must
be careful not to paint anything where the "traffic light" buttons are:
<img width="87" height="47" alt="image"
src="https://github.com/user-attachments/assets/0e878c8e-7141-4fed-bbc8-4d542ddb5251"
/>
`eframe::WindowChromeMetrics` helps you with that!
