Widgets/Style sheets: "border-radius" not working for QWebEngineView

Hello,

I greatly appreciate the hard work and dedication your team puts into maintaining this project.

I've been working on developing a desktop app framework using PySide6 as an alternative to Electron. While doing so, I've encountered various issues and have often resorted to workarounds or hardcoding solutions. However, this particular issue has proven challenging to resolve, despite thorough research and attempts at alternative approaches, so I am submitting it here.

When trying to create a frameless implementation on macOS, I've noticed that the default radius style is removed, resulting in a rectangular shape instead of a rounded one. While other widgets allow for radius properties to be applied seamlessly, I haven't been able to achieve the same effect with QWebEngineView.

What I'm looking for is a way to maintain the radius styling on the QWebEngineView itself when using a frameless window, without requiring additional margins.

If there is an existing property or method that I've missed, I'd greatly appreciate guidance on how to use it. If not, I kindly request that this issue be addressed.

Thank you again for your time and effort. Your work is invaluable to the community.