Function mount_gpu_info 

pub(crate) fn mount_gpu_info(
    world: &mut World,
    ui: Entity,
    device: Device,
    initial: Option<Rect>,
)

Mount the GPU-info panel, a draggable window in the bottom-left corner.

A window rather than an anchored area so the user can move it out of the way. It is an ordinary window, in the layer the scene’s own windows are drawn in: the title bar then highlights exactly when it is the window on top, the same as the selector’s, and a scene panel dragged over it covers it the same way.

The device is read here, once, where it is in hand; the panel then draws from the strings that read produced.