Draft: Add a (temporary) way to attach popups to layer surfaces
The new API is temporary. It's needed to help us with porting plasma to the layer shell protocol until Qt 6.6 is released, which includes QWaylandShellSurface::attachPopup().
The new API is temporary. It's needed to help us with porting plasma to the layer shell protocol until Qt 6.6 is released, which includes QWaylandShellSurface::attachPopup().